Geoscience Research Institute


R. H. Brown
Geoscience Research Institute

Origins 8(1):20-45 (1981).
    Related pages — | IN A FEW WORDS | REACTION |

The collection of references in this paper comprises the evidences for the age of the matter in the universe, and is intended to provide a handy source of bibliographic information in this area.

    Scientific creationism that is neutral with respect to religious issues has no need to defend a particular viewpoint regarding time. Proceeding only on the basis of inductive logic, it is free to pursue any interpretation that may seem to be suggested by available data. The data related to chemical evolution probabilities, thermodynamic considerations, spontaneous origin of life, genetics, and paleontology lead naturally to the conclusion that life and the life support system are products of intelligent design and creative ability. But at present there are no data that independently suggest inductively either a 6-day creation week or placement of such an event within the last 8000 years.
    In contrast with neutral scientific creationism, apologetic scientific creationism utilizes deductive logic in an effort to relate satisfactorily available scientific data to viewpoints derived from religious sources. Some individuals would insist that only neutral scientific creationism is truly "scientific." However, apologetic scientific creationism can be defended as truly "scientific" to the extent that it does not go beyond sound principles of logic, data collection, and data evaluation. Efforts to explain data concerning the natural world within the constraints of the first eleven chapters of Genesis, if carried out in a sound scientific manner, would be classified as apologetic scientific creationism.
    In certain areas apologetic scientific creationism may have an advantage over neutral scientific creationism and non-theistic science in that it operates from a larger data base and may develop scientifically sound interpretive models that would not have been accessible by pure inductive logic. This advantage is illustrated by a comparison between a reconstruction of an event based on both the testimony of a reliable eyewitness and analysis of the consequences, and a reconstruction based on only analysis of the consequences. These two reconstructions may be evaluated on the basis of which one provides a better account of the available after-the-event data.
    On the basis of the principle that truth is consistent, irrespective of the means by which it is apprehended, one can say that when rightly understood, natural science and authentic historical or religious source material agree, each complementing and supplementing the other. Accordingly, apologetic scientific creationism can be an instrument for arriving at a more correct understanding of specifications obtained from a religious source, as well as of data obtained from investigation in the natural sciences.
    It may be appropriate to digress at this point and state my conviction that in a pluralistic society such as the United States only neutral scientific creationism is appropriate for inclusion in public school science curricula. A limited amount of apologetic scientific creationism would be appropriate in a public school sociology course that aims to acquaint the student with the various streams of thought in modern culture.
    Geo and cosmic chronology are major concerns of creationist literature, usually from an apologetic viewpoint. The major purpose of this essay is to provide the reader with convenient access to the principal areas of evidence that must be taken into account by any scientific treatment of geo and cosmic chronology. For each of these areas I have endeavored to provide an introduction to the pertinent literature. Limitations of time and interest have prevented me from providing an adequate bibliography for some of the areas that are included in this outline.

Radiation Cooling of the Earth (1)

    Serious attempts to determine the scale of geochronology on a scientific basis began in 1862 when William Thomson, who later became Lord Kelvin, estimated that planet Earth could have cooled from a molten state to its present temperature configuration within between 400 and 20 million years (m.y.). This constraint was an irritation to Charles Darwin who sensed that it did not provide sufficient time for his model of biologic evolution. By 1897 Lord Kelvin had narrowed the range of uncertainty in his estimate to between 40 and 20 m.y. By including the contribution of heat presumed to be available from radioactive material, the geophysicist, Arthur Holmes was able in 1947 to extend this estimate of cooling time to between 2 and 4 billion years (b.y.).

Mineral Content of Seawater (2)

    The astronomer Edmund Halley suggested in 1715 that planet Earth might be "much older than many have hitherto imagined," and proposed that the salinity of the ocean might provide a basis for an estimate of its minimum age. By 1898 sufficient information on the rates at which the major rivers carry salt into the ocean became available to permit John Joly to estimate that the present salinity of the ocean could be attained within 80 to 90 m.y. In the early 1940s this estimate was reexamined and extended to between 150 and 250 m.y. on the basis of processes by which salt is now known to be recycled from the sea back to the land. By postulating slower input from rivers in the ancient past, Arthur Holmes was finally able to suggest an age of the Earth between 1 and 7 b.y. on the basis of ocean salinity.

Earth-Moon Separation (3)

    As the principles of celestial mechanics were developed it became evident that tidal friction causes both Earth and Moon to slow down in their rotations until they each maintain the same face toward the other (no further tidal energy dissipation). During this process the separation between them gradually increases as required to conserve angular momentum. On the basis of his study of tides throughout the world Lord Kelvin came to the conclusion that the Earth-Moon system had been in existence less than a billion years. G. H. Darwin estimated that the present Earth-Moon separation has been achieved in 57 m.y. More recent calculations indicate that, beginning with close proximity to Earth, the Moon would reach its present separation distance in between 1 and 4 b.y.

Denudation of Igneous Rocks (4)

    The previously mentioned early efforts to obtain an age estimate for planet Earth are significant only for their historical interest. They depend on highly uncertain initial assumptions concerning a molten state of the planet, a fresh-water ocean, and a tightly bound Earth-Moon system. Another interesting attempt to obtain an age for the Earth is based on the assumption that all sedimentary rocks have been produced by erosion of igneous rocks, at present rates. The uncertainties in these rates and in the volume of sediments involved lead to estimates in the range between approximately 400 million and 3 billion years.

Comet Frequency (5)

    The existence of comets has been taken to indicate that the Solar System has not been in existence longer than a few million years. This conclusion comes from recognition that because of evaporation, radiation pressure, and solar wind effects very few comets survive as many as ten trips around the Sun. Since there is only speculation concerning the manner in which the Solar System has acquired cometary material, and there is absolutely no data with respect to the inventory of this material at any time, one should not expect the frequency with which comets appear to give a reliable indication of the scale for Solar System chronology.

Cosmic Dust Density (6)

    There is sufficient cosmic dust in interplanetary space to produce the phenomenon known as Zodiacal Light. In the order of 10-100 thousand tons of this dust are captured by Earth each year. Since this dust is constantly swept up by the planets, driven out of the Solar System by radiation pressure, and pulled into the Sun as a result of the Poynting-Robertson effect, its present existence has been taken as evidence that the Solar System has been in existence no longer than approximately 2 b.y. It can be shown that all particles smaller than one centimeter in diameter would be removed from the space between Earth and the Sun within 10 m.y. The credibility of maximum Solar System age estimates based on the density of cosmic dust suffers from our ignorance concerning the distribution of this material in the past, and particularly from our ignorance concerning the amount of such material that may be swept up as the Solar System moves through its galaxy.

Synchronous Orbits of Satellites (7)

    The Moon is in a synchronous orbit, i.e., it makes precisely one rotation on its axis for each revolution about the Earth, with the result that it always shows the same face toward Earth. Any elastic object orbiting in a force field that causes deformation will approach a synchronous orbit due to conversion of rotational energy into heat by internal friction. The synchronous orbit of the Moon may be taken as evidence that the Earth-Moon system has been in existence for many hundreds of millions of years, presuming the Moon was once rotating more rapidly than at present.
    All planetary satellites that have been adequately observed (telescopic observation of Jupiter and Saturn, space probe observation of Mars, direct observation of the Moon) are in a synchronous orbit. Most of these satellites are marked by craters from meteoroid impacts that would have changed the rotation rate of these satellites. Calculations have been made of the amount of time that would be required for the Martian satellites to reach a synchronous orbit after the last significant perturbation by meteoroid impact. The greater the orbit radius the weaker the tidal forces will be, and the longer the time required to achieve a synchronous orbit. For the outermost satellite of Mars, Deimos, the estimated minimum synchronization time is 3 m.y. if the structure is compacted sand, and 100 m.y. if it is solid basalt.

Synchronous Orbits of Planets (8)

    The planets experience tidal forces that reduce their motions to synchronous orbits with respect to the Sun. The motion of Venus is within -8% of perfect synchronism (retrograde spin with -243/225 spin/orbit periods in Earth days). Mercury has a commensurate orbit with a spin/orbit period ratio of 2/3 (58.6/88 in Earth days). A spin/orbit period coupling of 2/3 is a resonant state that is stable and is a special case of synchronous orbits. A mass distribution of Mercury and/or the Sun that does not have perfect spherical symmetry (dipole and higher terms in the gravitational field) could prevent a transition of the spin/orbit ratio from the 2/3 state to the 1/1 state.
    More amazing is the discovery that Venus is in a synchronous relationship with respect to Earth. Venus turns the same face to Earth at each inferior conjunction. The most reasonable explanation of this relationship requires gravitational coupling between Earth and Venus over a time period in the magnitude of billions of years. The lack of a synchronous relationship of Earth with respect to Venus is explainable as the consequence of the diurnal cycle necessary for the maintenance of organic life and established at the beginning of the creation week described in the first chapter of Genesis. In summary, one can say that the observed characteristics of the inner planet orbits indicate that the Solar System has been in existence for a billion years, or more.

Extraterrestrial Erosion (9)

    Rocks on the surface of the Moon are found to be highly eroded. They are pitted, have rounded edges, and are often surrounded by a sloping bank of fine material that can be described as soil, while the buried portion may have relatively smooth surfaces bounded by sharp angular edges. The factors that produce this erosion are expansion and contraction associated with rapid extreme changes in temperature, the "sandblasting" effect of micrometeoroid bombardments, and sputtering produced by the solar wind.
    Fresh-looking craters with sharp edges are found superimposed on highly eroded, "old," rounded-off craters, some of which are so eroded as to be scarcely discernible. In the highland areas of the Moon craters are found in a saturation distribution (further meteoroid bombardment would not produce a major change in the crater density, obliterating previous craters as rapidly as new ones are formed). But in the mare areas the crater density is only 1 /10 to 1/50 as great. The evident interpretation is that since the mare areas were filled in by lava flow they have been exposed to meteoroid impact for a much shorter time than have the highland areas. The impact crater density on the Moon cannot be accounted for within a 5 b.y. time span unless the meteoroid impact rate is assumed to have been much greater during the early history of the Solar System than it has been during recorded Earth history.
    The totality of this evidence leads to the conclusion that the Moon has been in existence as a solid object for a time in the order of at least one billion years.
    Similar features of crater distribution and erosion have been revealed in the televised pictures sent from Mercury and Mars by space probes. The erosion features seen on Mercury are probably due to the same processes that have been operating on the Moon. Mars is experiencing strong aeolean erosion at the present time. It appears to have had an episode of severe fluid erosion under climatic conditions vastly different from those that can be accounted for under present circumstances.

Light-Year Scale (10)

    Astronomers have good reasons for believing that they are now observing galaxies and quasars that are tens of billions of light years distant from Earth. If the current estimation of distance for these objects is correct, the universe must have been in existence for at least tens of billions of years.

Galaxy Clusters (11)

    Galaxies are known to be grouped in clusters. At the present state of our knowledge concerning the mass of matter contained within galaxies, the gravitational forces that can be expected to act between members of a cluster are not sufficient to hold the cluster together. With the individual galactic motions that have been observed, the known galactic clusters can be expected to dissolve within less than 100 b.y. On the basis of this argument some galactic clusters have been considered to be no more than 2-4 b.y. old.

Spiral Galaxy Structure (12)

    The Milky Way and its neighbor, Andromeda, belong to the Spiral Galaxy classification. It is thought that the spiral arm features of these galaxies would be obliterated after between one and three full rotations of the galaxy about its center of mass, since the angular velocity of revolution increases the closer a star is to the galactic center. On the basis of the rotation rates that have been observed, the lifetime of spiral galaxies has been estimated to be in the order of 300 m.y. Accordingly, our own galaxy would not be more than 300 m.y. old. It has been suggested that spiral arm galactic structure is not due to an initial star distribution, but rather is the result of gravity waves that cause the stars to bunch together in a cyclic manner as they revolve about the galactic center of gravity.

Star Clusters (13)

    Many of the stars within galaxies are themselves grouped into clusters. It is expected that perturbing gravitational influences from nearby stars and star clusters will gradually pull these clusters apart. Detailed consideration leads to the estimate that star clusters are no more than 3-6 b.y. old.

Binary Stars (14)

    Within our own Milky Way galaxy it is possible to observe that many of the stars are gravitationally coupled in pairs that revolve about a common center of mass. It can be expected that a high proportion of binary stars is to be found only in a relatively young galaxy, for the perturbing influences of nearby stars should slowly pull the binary stars apart. On the basis of the expected mean lifetime of a binary star system our galaxy has been estimated to be less than 10 b.y. old.

Stellar Dynamics (15)

    With the knowledge of thermonuclear reactions man has acquired since World War II, and with the aid of electronic computers, it is possible to predict the detailed history of a large mass of hydrogen gas that will experience nuclear fusion under gravitational confinement — i.e., calculate the history of a star. Astronomers can observe numerous stars that have the characteristics associated with each state but one in the theoretical life history of a star. The stage for which no definite example has yet been found is the extremely rapid transition (lifetime measured in months) to the White Dwarf stage.
    If the correspondence between real stars and the theoretically determined life history of a star is not merely fortuitous, one can confidently state that an average star such as our Sun has a life of approximately 10 b.y., provided it is maintained as an isolated system without replenishment of fuel (hydrogen). According to this model, the observed distribution of star types places the age of our galaxy, as well as the age of the universe, at not less than 10 b.y.

Residual Radioactivity (16)

    The accidental discovery of radioactivity by Henri Bequerel in 1896 initiated a series of developments that have provided man with his most precise and most reliable tools for investigating geo and cosmic chronology. The most crucial steps in this development were the discovery of spontaneous atomic transmutation by Madame Curie in 1898, and the discovery of isotopes by Sir J. J. Thomson in 1913. Instrumentation and laboratory techniques developed since World War II have made possible spectacular advances in geo and cosmic chronology.
    An infinitely old object would not be radioactive, for any radioactive isotopes it may have contained originally would have transformed to stable daughter isotopes. The presence of uranium in minerals from Earth, the Moon, and meteorites indicates that these components of the Solar System have been in existence less than 20 b.y. The present ratio of uranium-235 to uranium-238 further indicates that Earth and the Solar System have not been in existence longer than about 5 b.y.

Extinct Radioactivity (17)

    Uranium-235, which is the basis of the contemporary nuclear energy technology, is present as only 0.72 atom percent of relatively rare uranium. The half-life of uranium-235, 704 m.y., is the lowest among unsupported radioactive nuclides that are known to exist in significant quantity throughout the Solar System. The next lower half-life among the nuclide possibilities is 170 m.y. (within a factor of two) niobium-92. There is 90 percent confidence that niobium-92 has been observed at (1.2 ± 0.7) × 10-10 percent isotopic abundance in association with stable niobium-93. No evidence for natural occurrence of 100 m.y. samarium-146 has yet been found. Diligent search with the most sophisticated techniques has detected 83 m.y. plutonium-244 at approximately 10-16 weight percent in a sample of the rare earth bastnaesite. Since plutonium is chemically similar to cerium, it is most likely to be found in a high-cerium-content mineral such as bastnaesite. Search for other unsupported radioactive nuclides with half-life less than 80 m.y. has been diligent but unfruitful.
    All nuclides that are stable or have half-lives greater than 80 m.y. have been found in Earth, Moon and meteorite material. In Solar System material there is both fission-track and daughter-product isotope evidence for the prior existence of extinct 100 m.y. samarium-146, 83 m.y. plutonium-244, 15.9 m.y. iodine-129, 15.4 m.y. curium-247, 6.5 m.y. palladium-107 and 740,000 year aluminum-26. The conclusion from this evidence is that at least some components of Earth and other members of the Solar System have been in existence as solid objects for no less than 300 m.y. — the time for a 90 m.y. half-life nuclide to reach 1/10 of its initial concentration. Since there is good reason for expecting that in a creation of elementary matter plutonium-244 appears in the ratio of 0.013/1 with respect to uranium-238, the data on the present availability of natural plutonium-244 indicates that the matter from which the bulk of the Solar System is constructed has been in existence in the order of 5 b.y. Similar consideration regarding niobium-92 yields the same conclusion.

Cosmogenic Radioactivity (18)

    Atomic nuclei that have been ejected from stars and acquired immense amounts of kinetic energy are known as cosmic rays. (The relatively low energy atomic particles emitted by a star are known as "solar wind"). These cosmic particles have the capability to shatter atoms which they may strike. Some of the atom fragments thus produced are unstable atoms of a simpler construction than the target atom that was shattered. (Spallation is the scientific name for this process). Unstable atoms produced in this matter are described as having cosmogenic radioactivity.
    The half-lives of the principle cosmogenic radioactive products range from 5.7 day Mn52 to 740 thousand year Al25, 1.6 m.y. Be10, and 3.7 m.y. Mn53. Some 1.28 b.y. K40 is also produced in this manner. After exposure to a constant cosmic ray flux for a time equal to about four half-lives, a cosmogenic radioactive nuclide reaches an equilibrium concentration at which the number of new atoms formed within a given period of time is equal to the number that experience radioactive decay during the same time.
    The land and water surface of Earth is protected by the atmosphere from primary cosmic radiation. In meteorites and in material that has been secured from the Moon we have access to objects that contain cosmogenic radioactivity. The cosmogenic nuclides from 5.7 day Mn52 to 740 thousand year Al26 and 3.7 m.y. Mn53 found in these objects are in almost all cases in equilibrium with the present cosmic ray flux. This implies that the meteoroids and the surface of the Moon have been exposed to cosmic rays for at least 15 m.y., that the intensity of cosmic rays at present is very close to the average intensity over the past 15 m.y., and that the intensity of cosmic rays probably has not varied by more than a factor of two during this time. A short burst of radiation at some time in the recent past could adjust two cosmogenic nuclides to be in equilibrium with the present cosmic ray intensity, but it is inconceivable that as many as eleven could be simultaneously adjusted in this way.

Cosmic Ray Exposure (19)

    The shattering of atoms by impact from cosmic rays produces both stable and unstable nuclides. The stable spallation products accumulate continuously as long as there is exposure to cosmic radiation. In many cases stable cosmogenic nuclides can be clearly distinguished from primordial matter. In such cases the concentration of a cosmogenic nuclide indicates the amount of exposure to cosmic radiation. The time of exposure, or cosmic ray exposure age, is readily obtained by dividing the amount of exposure by the exposure rate — the cosmic ray intensity. Within the experimental uncertainties, independent cosmic ray exposure age determinations with nuclides such as He3, Ne21, Ne22, and Ar38 are usually in agreement.
    As a primary cosmic ray particle passes through a solid it disrupts the crystalline arrangement along its track. In certain minerals it is possible with appropriate etching techniques to make these tracks visible in a microscope. The density of these cosmic ray tracks provides an independent measure of the total exposure to cosmic radiation, and the cosmic ray exposure age. If the mineral has not experienced heating or shock that erases damage patterns by realignment of crystal structure, the cosmic ray exposure age determined by track analysis may be expected to be in agreement with that determined by stable cosmogenic nuclide analysis.
    Cosmic ray exposure ages for meteorite and lunar material that has been studied are scattered over a range from one million to one billion years, with strong grouping at several points over this range. The range over which these exposure ages fall has been taken to indicate that at various times portions of the lunar surface have experienced turnover due to volcanic activity and meteoroid impact; and that meteorites have been formed by the breakup of larger objects at various times in the history of the Solar System.

Radioactive Decay Sequences (20)

    The possibility of using radioactive elements for determining chronology was recognized by Lord Rutherford in 1904. Substantial radiometric dating was not achieved until many years later, after techniques had been developed for quantitative analysis of isotopes. At the present time as many as ten independent techniques may be available for determining radioisotope age of a mineral specimen.
    Among the various radioisotope age determination techniques there is potential capability for indicating the time at which the matter of which a specimen is composed, experienced events such as nucleogenesis, solidification, heating, remelting, shock, mixing with other material, exposure to water, and exposure to high energy radiation. Because a given sample may have experienced two or more such events all the various radiometric age determinations that may be performed on it should not be expected to be in agreement. Disagreement between independent radiometric age determinations (discordance is the technical term) may be taken as an indication that the sample has a complex history, and may provide useful insight into the chronology of events that the sample has experienced.
    The many cases in which chemically and physically independent radiometric age determinations are in agreement (concordant) within limits of precision and accuracy indicate that radiometric dating procedures may yield physically significant results, regardless of whether there may not be a one-to-one correspondence between a specific radioisotope age and real time. Discordant ages generally have a rational explanation in terms of metamorphic events that the sample may have experienced.
    It is well known that a radiometric age is equivalent to the corresponding real time age if the initial conditions are specified with sufficient accuracy and precision, the associated radioactive decay constant(s) has (have) not changed essentially during the time involved, and the sample has been chemically isolated during this time. The large number of cases in which essential agreement exists between diverse radiometric age determinations can hardly be fortuitous, and indicate that samples can be obtained which meet the requirements for conversion of radiometric age into real time. All the radiometric age data that have accumulated for minerals from meteorites, the Moon and planet Earth lead to the conclusion that these portions of the Solar System have been in existence and contained solid material for 4.56 b.y. The available radiometric evidence indicates that the present crust of Earth does not contain rocks older than 3.9 b.y.

Inherited Radiometric Age (21)

    If a radiometric age can be satisfactorily converted into real time there often still remains a problem in determining the nature of the event that initiated the time period. Radiometric dating techniques were developed in a climate that fostered a presumption concerning vast ages for the evolutionary development of living organisms, and that stimulated search for evidence supporting such ages. This situation gave rise to a naive, oversimplified, and unjustified assumption that radiometric "clocks" are set at zero in transport of mineral by igneous processes, and also in many sedimentary processes. According to this assumption a radiometric age of mineral that has replaced organic material, that has been injected into a fossiliferous stratum, or that overlies fossils gives a minimum real-time age for the association with the fossils involved. It would be both unfair and unkind to most of the individuals who have supported this assumption to describe it as "the graveyard hoax"; yet such description emphasizes an important consideration that is generally overlooked. Radiometric ages for the mineral components of the soil in a cemetery plot are not expected to date the burials made there.
    There is ample evidence that radiometric chronometer systems are often set to zero time in natural processes that transport or metamorphose minerals, as popularly assumed. It is not so well recognized that the inheritance of previously established radiometric age characteristics through metamorphic and transfer processes is also well established in the scientific literature. Situations are known in which even fission track and potassium-argon age characteristics have survived through a subaerial volcanic event. The survival may be anywhere between total and zero. A potassium-argon age of 465,000 years has been reported for volcanic material overlying trees that were buried by the eruption and have a carbon-14 age of only 225 years (McDougall et al. 1969). It has become recognized that the radioisotope characteristics of intrusive and volcanic material may be related more to the crustal material through which the magma was ejected and to the characteristics of successive zones in the magma chamber than to the time at which the transfer took place. There also is evidence that the radioisotope age characteristics of sediments may be related more to the source from which the material was derived than to the time at which sedimentation occurred. Extensive references to the literature on inherited radiometric age are appended to this paper.

Radiation Damage (22, 23)

    Radioactive decay produces structural and electronic damage tracks in the host mineral. These damage tracks can be quantitatively analyzed to determine the total radiation exposure. A quantitative analysis of the amount of radioactive material available for producing the observed damage tracks readily leads to a computation of the irradiation time. The result is a radiometric age based on the evidence left by the radiogenic products, rather than on an assay of the products themselves. The evidence may be trapped excited electron states produced by alpha, beta or gamma radiation; or it may be crystal lattice dislocation produced by alpha particles, recoil of alpha-emitting parent nuclei, or fission products.
    The excited electrons are detected by observing the optical radiation produced when the mineral is heated sufficiently to free the trapped electrons and allow them to return to their ground (lowest energy) state. The technique involved is known as thermoluminescence or electroluminescence dating. Since the excited electrons slowly return to the ground state at normal temperatures, this technique has a relatively short time range. Although a 300,000 year range has been claimed (Göksu et al. 1974) other authorities limit its usefulness to about 4000 years (Michels 1973). This method of dating further suffers in lack of precision (22).
    The crystal lattice dislocation tracks produced by radioactive decay can be seen with a microscope after suitable etching. Where high concentrations of radioactive material have existed regions that contain alpha-particle damage tracks can be seen without resort to etching techniques, as in pleochroic halos (more correctly termed radiohalos). The density of these halos can be related to the concentration of radioactive material at their center to obtain a crude estimate of the minimum exposure time involved in producing the halo. Microprobe analysis permits relatively precise evaluation of radiogenic daughter to radioactive mother ratios in the halo nucleus. These ratios can readily be expressed in terms of a radioisotope age.
    Radiometric ages obtained from tracks produced by parent nucleus recoil, alpha-particles, or fission fragments often are in agreement, or at least consistent, with ages obtained from daughter/parent ratios. Discordant but consistent situations arise when there has been total or partial annealing of radiation tracks by elevation of temperature, or migration of either parent or daughter atoms as a result of heating or contact with water.
    The existence of isolated polonium radiohalos in uraniferous fossil wood (Gentry et al. 1976) indicates that radiohalos may be formed as a result of prolonged deposition of radioactive material at a halo center site, and are not always dependent on an initial concentration of radioactive material.

Chondrite Structure Features (24)

    Radiation damage track investigations have turned up some remarkable evidence concerning the history and formation of meteoroids. Meteorites that have been classified as chondrites are made up of units called chondrules that are cemented together in a matrix to form the meteorite body. Some of these chondrules from inside the meteorite body have been found to be marked on their surfaces by micro-meteoroid impact pits, and to contain in a thin layer of their surface solar wind atom implants and damage tracks from the low energy cosmic radiation produced by the Sun. Identical phenomena are found on the surface of rocks obtained from the Moon. (Ablation during passage through Earth's atmosphere removes such features from the surface of meteorites). Some chondrules have sharp fracture edges. This evidence strongly indicates that chondrites have been formed from an accretion of smaller meteoroid bodies which had been in existence long enough to acquire substantial exposure to solar radiation and cosmic dust.


    The picture that emerges from all the data that relate to cosmic chronology appears to be one of dynamic physical processes operating over extended periods of time, during the last 4.5 billion years of which discrete entities of the Solar System have been in existence.

Theological Issues

    It would not be appropriate to conclude this presentation without some consideration of related theological issues.
    Any interpretation that is made of the available inspired testimony must satisfactorily accommodate the various lines of evidence concerning geo and cosmic chronology in accord with the basic hermeneutic principle that the books of nature and the Scriptures should be consistent with each other.
    It is possible to interpret the book of Genesis to require that all matter in the Solar System came into existence ex nihilo by fiat creation less than 10,000 years ago. This interpretation requires that all the features of mineral, meteoroid, planetary body, and planetary satellite age were the immediate expression of deliberate design on the part of the Creator, and have no relationship to actual age. We should recognize that God has the prerogative to produce a creation in this manner, and that doing so would be less extraordinary than producing the total complex of organic life on this planet within four 24 hour days.
    It also is possible to interpret the inspired testimony concerning creation as an eyewitness-style account using language of appearance to describe creative activity that within six consecutive 24-hour days equipped this planet with the total complex of its organic life and established the physical circumstances on which this life depends. According to this interpretation our planet may now contain matter that was in existence as a consequence of creative activity prior to the Genesis Creation Week, matter that was brought into existence during Creation Week, and a relatively minute amount of matter that came into existence in connection with Christ's miracles (specifically His feeding of the multitudes).
    Let everyone be persuaded in his own mind as to which interpretation he should favor, giving appropriate respect to the considerations that may lead others to choose differently.



(1) Radiation Cooling of Earth

(2) Mineral Content of Seawater

(3) Earth-Moon Separation

(4) Denudation of Igneous Rocks

(5) Comet Frequency

(6) Cosmic Dust Density

(7) Synchronous Orbits of Satellites

(8) Synchronous Orbits of Planets

(9) Extraterrestrial Erosion

(10) Light-Year Scale

(11) Galaxy Clusters

(12) Spiral Galaxy Structure

(13) Star Clusters

(14) Binary Stars

(15) Stellar Dynamics

(16) Residual Radioactivity

(17) Extinct Radioactivity

(18) Cosmogenic Radioactivity

(19) Cosmic Ray Exposure

(20) Radioactive Decay Sequences

(21) Inherited Radiometric Age

(22) Thermoluminescent Dating

(23) Nuclear Radiation Track Dating

(24) Chondrite Structure Features

© 1981

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