The Denver Formation is a geological formation that is present within the central part of the Denver Basin that underlies the Denver, Colorado, area. It ranges in age from latest Cretaceous (Maastrichtian) to early Paleocene, and includes sediments that were deposited before, during and after the Cretaceous-Paleogene boundary event.
The Arapahoe Formation is a geological formation of latest Cretaceous (Maastrichtian) age that is present within the Denver Basin that underlies the Denver, Colorado, area. The formation includes fossil leaves and dinosaur remains, although none of the latter have yet been referred to a specific genus. It also includes aquifers that are important sources of water for the area.
The Chagres Formation (Tc) is a geologic formation in the Colón Province of central Panama. The sandstones and siltstones were deposited in a shallow marine environment and preserve fossils dating back to the Middle to Late Miocene period.
Charco Azul Formation is a geologic formation of the Charco Azul Group in western Panama and southeastern Costa Rica. It preserves gastropod fossils dating back to the Pliocene period.
The Cucaracha Formation (Tca) is a geologic formation in Panama. It preserves vertebrate and plant fossils dating back to the Neogene period; Early to Middle Miocene epochs (Hemingfordian). Fossils of the crocodylian Centenariosuchus, the turtle Rhinoclemmys panamaensis and the artiodactyl Paratoceras have been found in the formation.
The Gatún Formation (Tg) is a geologic formation in the Colón and Panamá Provinces of central Panama. The formation crops out in and around the Panama Canal Zone. The coastal to marginally marine sandstone, siltstone, claystone, tuff and conglomerate formation dates to the latest Serravallian to Tortonian, from 12 to 8.5 Ma. It preserves many fossils, among others, megalodon teeth have been found in the formation.
The Caimito Formation (Tcm) is a geologic formation in Panama. The marls, sandstones and conglomerates preserve bivalve and gastropod fossils dating back to the Late Oligocene to Early Miocene period. The name Caimito was proposed by MacDonald in 1913, named after the Caimito junction in the Panama Railroad during the construction of the Panama Canal.
The Culebra Formation (Tcb) is a geologic formation in Panama. It preserves fossils dating back to the Miocene period; Early Miocene epoch, Aquitanian to Burdigalian stages. Fossils of Culebrasuchus have been found in and named after the formation. The thickness of the formation is at least 250 metres (820 ft) thick, and the age has been estimated as from 23 to 19 Ma.
The Bohío Formation is a geologic formation in Panama. It preserves fossils dating back to the Late Eocene to Late Oligocene period.
The Caraba Formation (Tcr) is a geologic formation in Panama. The formation was first defined in 1950 by Jones as a facies member of the Caimito Formation. The formation consists of poorly lithified, pebbly, tuffaceous, calcareous sandstones and conglomerates and preserves fossils dating back to the Early Oligocene period.
The Gatuncillo Formation (Tgo) is a geologic formation in central Panama. The formation is exposed in the Panama Canal Zone and surrounding areas. It preserves fossils dating back to the Middle to Late Eocene period.
The Tonosí Formation is a geologic formation in Panama. It preserves fossils dating back to the Paleogene period (Priabonian).
Fusiturricula acra is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.
Cryoturris habra is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Crassispira aegis is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira annella is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira jamaicense is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies. Fossils have been found in Jamaica.
Conasprella burckhardti is an extinct species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.
The Alajuela Formation, originally Alhajuela Formation (Tau), is a Late Miocene geologic formation in the Panama Canal Zone of central Panama.
Wendell Phillips Woodring was an American paleontologist and geologist. He gained an international reputation for his research on invertebrate fossils of the Tertiary and in the stratigraphy of the Tertiary in California, Central America, and the Caribbean.
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