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Archaeotherium
The skull in this picture belongs to an entelodont, a pig-like mammal that could reach the size of a cow. Specimen from the Oligocene of South Dakota, on display at Chicago Field Museum of Natural History.
Gornergrat Panorama
Panorama from Gornergrat looking towards the west. The peak on the left is the Matterhorn; the next peak is Dent Blanche. Both peaks are part of the Dent Blanche Nappe. The peak on the far right is Weisshorn.
Rainbow Curve Life Zones
Layers of Life, Rocky Mountain National Park --- An interpretive sign labels the ecosystems viewed at different elevations from this roadside stop: montaine, subalpine, and alpine. A total of eight different ecosystems can be found in Colorado, each with its own set of plants and animals.
Cal Orcko dino trackways
Site of dinosaur footprints of Cal Orcko, in Sucre, where more than twelve thousand prints have been found on numerous trackways in this wall of limestone and sandstone inclined at about 70 degrees, 1200 m long, and 80 m high. Researchers have found almost 300 ichno species on this exposure.
Frigate
One of the most characteristic Galápagos seabird is the frigatebird, an elegant black bird with a wingspan of more than a meter, capable of performing the most incredible aerial maneuvers.
Faulting and deformation
Normal faulting of layers has resulted in lowering of the block to the right of the image. Note, however, the presence of an intensely deformed area along the fault zone, with evidence of plastic deformation. Cretaceous El Molino Formation, near Torotoro, Bolivia.
Homo erectus
A set of Homo erectus calvaria (skull caps) on display at the Chicago Field Museum of Natural History. The sudden appearance of Homo erectus in disparate geographic areas from Africa to east Asia contrasts with the traditional gradualistic model of human evolution.
Roche Mountonné at Gorner Glacier
Smooth mounded rocks called roche moutonné (sheep rocks) formed by the action of the Gorner Glacier on the crystalline basement of the Monte Rosa Nappe. Note the striations on the rocks in the lower left corner.
Sierra Negra crater
Caldera of the Sierra Negra volcano, in the Isabela Island, 7 km wide and 10 km long