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These fossils were the oldest known vertebrate remains in the world at the time. The rocks preserving the fossils were gray and reddish sandstone deposited by shallow water. Other fossils found alongside the ostracoderms lived articulated brachiopods, conodonts, gastropods, ostracods, pelecypods, sponges, trilobites, and trace fossils left by ...
It preserves fossils from the Pleistocene Epoch, during the Quaternary Period of the Cenozoic Era. [3] Lower Pliocene sub−period petrified wood is found in Anza-Borrego Desert State Park. [4] The Lauraceae is represented by petrified Umbellularia, the Salicaceae with petrified Populus and Salix, and the Juglandaceae with petrified Juglans. [4]
The oldest terrestrial vertebrate fossils from the Colorado Desert predate the late Miocene invasion of the Gulf of California. These very rare fossils include a gomphothere (elephant-like mammal), rodent, felid and small camelid, and were collected from 10– to 12-million-year-old riverine and near-shore lake deposits.
Fossils of the Late Devonian-Permian fern-like fronds Pecopteris †Pecopteris †Pecopteris arborescens †Pecopteris pinnatifida †Pentaricida †Pentaricida pentagonalis †Pentaridica †Pentaridica pentagonalis †Petrablattina †Petrablattina aequa – type locality for species †Petrodus †Petrodus patelliformis †Phyloblatta
The Ocotillo Formation is a Pliocene fluvial-alluvial fan geologic formation in the Colorado Desert of Southern California. [ 1 ] It occurs in western Imperial County and eastern San Diego County .
This list of prehistoric sites in the U.S. State of Colorado includes historical and archaeological sites of humans from their earliest times in Colorado to just before the Colorado historic period, which ranges from about 12,000 BC to AD 19th century. The Period is defined by the culture enjoyed at the time, from the earliest hunter-gatherers ...
This list of the prehistoric life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado. Precambrian [ edit ]
Acanthichnus – tentative report Acila † Acila chicotana Acmaea † Acmaea genettae – type locality for species † Adocus † Albanerpeton † Albanerpeton nexuosus † Albertosaurus – tentative report † Allantodiopsis † Allantodiopsis erosa † Allantodiopsis JC018 – informal Life restoration of the Late Jurassic theropod dinosaur Allosaurus † Allosaurus – type locality for ...