Colognathus is a genus of extinct reptile from Late Triassic rocks of the southwestern United States. It was described in 1928 from a jaw fragment by Case, who interpreted the new taxon as a fish. The type species is C. obscurus.
The St. Laurent Formation is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period.
The St. Louis Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The Stirling Quartzite Formation is a geologic formation in the northern Mojave Desert of Inyo County, California and Nye County and Clark County, Nevada.
The Wood Canyon Formation is a geologic formation in the northern Mojave Desert of Inyo County, California and Nye County and Clark County, Nevada.
The Zabriskie Quartzite is a Cambrian Period geologic formation of the northern Mojave Desert, in Inyo County, California and Nye County, Nevada.
The Antelope Shale is a geologic formation in the San Joaquin Valley of central California.
The Paso Robles Formation is a geologic formation in California, United States. It preserves fossils dating back to the Neogene period.
The Purisima Formation is a geologic formation in California that preserves fossils dating from the Late Miocene to Late Pliocene. It stretches from Point Reyes to the Santa Cruz Mountains.
The Green Valley Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
The Caliente Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
The Modelo Formation is a Miocene geologic formation in the Simi Hills and western Santa Susana Mountains of southern California, including under parts of Los Angeles.
The Rio Dell Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
The Topanga Canyon Formation is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California. It is primarily composed of hard sandstone with some inter-bedded siltstone.
The San Mateo Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
The La Jolla Group is a group of geologic formations in coastal southwestern San Diego County, California.
The Palm Spring Formation is a Pleistocene Epoch geologic formation in the eastern Colorado Desert of Imperial County and San Diego County County, Southern California.
The Ocotillo Formation is a Pliocene fluvial-alluvial fan geologic formation in the Colorado Desert of Southern California.
The Fullers Earth Formation is a geological formation that outcrops in southern England. It is also mostly present in the subsurface of the Wessex Basin and offshore in the English Channel Basin, Celtic Sea Basin and St George's Channel Basin. It preserves fossils dating back to the Bathonian stage of the Middle Jurassic series such as the pterosaur Dolicorhamphus. It is the lateral equivalent of the Rutland Formation, Sharp's Hill Formation, Calcaire d’Ecouché, and Calcaire de Caen
The Leukersdorf Formation is a geologic formation in Germany. It preserves fossils dating back to the lower Permian period. The Chemnitz petrified forest occurs within this formation, and fossils have been found in the Leukersdorf Formation since at least 1546.
Petrified wood in formation
