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Shaded relief map of the Llano Estacado. Texas contains a wide variety of geologic settings. The state's stratigraphy has been largely influenced by marine transgressive-regressive cycles during the Phanerozoic, with a lesser but still significant contribution from late Cenozoic tectonic activity, as well as the remnants of a Paleozoic mountain range.
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.
The geography of Texas is diverse and large. Occupying about 7% of the total water and land area of the U.S., [1] it is the second largest state after Alaska, and is the southernmost part of the Great Plains, which end in the south against the folded Sierra Madre Oriental of Mexico.
The Marathon Uplift is a Paleogene-age domal uplift, approximately 78 miles (126 km) in diameter, in southwest Texas.The Marathon Basin was created by erosion of Cretaceous and younger strata from the crest of the uplift.
The Goliad Formation (Tg) [1] is a geologic formation in Texas.It preserves fossils dating back to the Serravallian to earliest Pliocene stages (Clarendonian, Hemphillian and earliest Blancan in the NALMA classification) of the Neogene period, [2] including the gomphothere Blancotherium among many other fossil mammals, reptiles, birds and fish.
The Wilcox Group is an important geologic group in the Gulf of Mexico Basin and surrounding onshore areas from Mexico and Texas to Louisiana and Alabama. The group ranges in age from Paleocene to Eocene and is in Texas subdivided into the Calvert Bluff, Simsboro and Hooper Formations, [1] and in Alabama into the Nanafalia and Hatchetigbee ...
The Arroyo Formation, sometimes termed the Lower Clear Fork Formation, is a geologic formation in Texas. [1] It preserves fossils dating back to the Kungurian stage of the Permian period. [2] It is the lower-most portion of the Clear Fork Group, part of a series of fossiliferous Permian strata in the south-central United States known as the red ...
The Texas and Oklahoma red beds are sedimentary rocks, mostly consisting of sandstone and red mudstone. [8] The red color of the rocks is due to the presence of ferric oxide . [ 9 ] The rocks were deposited during the early Permian in a warm, moist climate, [ 10 ] with seasonal periods of dry conditions.