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During the Cambrian period, Texas was covered by a sea. [4] Cambrian life in Texas included brachiopods, gastropods, graptolites, and trilobites. [5] Areas of Texas distant from the shore were home to bivalves, brachiopods, sponges, and trilobites. [4] Contemporary graptolites were preserved in the central region of the state. [6]
Rifting events during the Cambrian Period (early Paleozoic) left fault zones in the region. These fault zones acted as planes of weakness for faulting that was later initiated by the Ouachita Orogeny. These fault zones caused the Tobosa Basin to be transformed, due to tectonic activity, into the Permian Reef Complex, which comprises three parts ...
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Cambrian: North America: US: Utah: Trilobites [Note 1] Woodbine, Texas [Note 2] Arlington Archosaur Site [Note 3] Woodbine Formation: Cretaceous (Cenomanian) North America: US: Texas: Dinosaurs and crocodilians: Ziegler Reservoir fossil site ('Snowmastodon Site') Pleistocene (Illinoian (stage)) North America: US: Colorado: Mastodon and other ...
Texas, Llano Uplift: Country: United States: The Moore Hollow Group is a geologic group in Texas. It preserves fossils dating back to the Cambrian period. See also
Llano Uplift - geologic map. The Llano Uplift can be considered an uplift by either its pattern on a geological or structural map of the top of the Precambrian rocks. It qualifies as an uplift because it consists of an extensive Precambrian basement high that is exposed by virtue of its surface lying significantly above in elevation the surface of surrounding Precambrian basement.
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The Riley Formation is a geologic formation in Texas. It preserves fossils dating back to the Cambrian period. See also. Earth sciences portal; Texas portal;