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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]
The Cambrian (/ ˈ k æ m b r i. ə n, ˈ k eɪ m-/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. [5] The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 486.85 Ma.
It was preceded by the less-documented (but probably more extensive) End-Botomian mass extinction around 517 million years ago, and the Dresbachian extinction event about 502 million years ago. The Cambrian–Ordovician extinction event ended the Cambrian period, and led into the subsequent Ordovician period.
The end-Botomian mass extinction event, also known as the late early Cambrian extinctions, refer to two extinction intervals that occurred during Stages 4 and 5 of the Cambrian Period, approximately 513 to 509 million years ago.
Texas has been the leading state in petroleum production since discovery of the Spindletop oil field in 1901. [11] As of October 2017, the State of Texas (if treated as its own nation) is the 7th largest oil producing nation in the world, with production totaling approximately 3.78 million barrels (600 thousand cubic meters ) per day of oil ...
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.
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 ...
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