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Texas is approximately bisected by a series of faults that trend southwest to northeast across the state, from the area of Uvalde to Texarkana.South and east of these faults, the surface exposures consist mostly of Cenozoic sandstone and shale strata that grow progressively younger toward the coast, indicative of a regression that has continued from the late Mesozoic to the present.
The northern hemisphere Ice age occurred in Pleistocene time, when a continental ice sheet reached as far south as Kansas during the Pre-Illinoian Stage. The Pleistocene terraces affected the development of Dallas, providing a rich alluvial soil and a perched aquifer , very useful indeed during the early years.
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 list of rivers of Texas is a list of all named waterways, including rivers and streams that partially pass through or are entirely located within the U.S. state of Texas. Across the state, there are 3,700 named streams and 15 major rivers accounting for over 191,000 mi (307,000 km) of waterways.
Seymouria was a twenty inch long transitional form documenting the origin of reptiles from their amphibian-like forebears from Texas. [40] Reptiles were becoming common during the Permian. [41] Texas was also home to the pelycosaurs Dimetrodon and Edaphosaurus. [40] Late in the Permian therapsids became the dominant large-bodied terrestrial ...
The 230-mile river runs from Central Texas all the way to the Gulf of Mexico. The most popular stretches to float are in the Texas Hill Country, especially near New Braunfels, Canyon Lake , San ...
Two portions of the Rio Grande are designated National Wild and Scenic Rivers System, one in northern New Mexico and the other in Texas, at Big Bend National Park. In mid-2001, a 328-foot (100 m)-wide sandbar formed at the mouth of the river, marking the first time in recorded history that the Rio Grande failed to empty into the Gulf of Mexico.
The Trinity River as viewed from Reunion Tower in Dallas in August 2015. The Trinity River is a 710-mile (1,140 km) [2] river, the longest with a watershed entirely within the U.S. state of Texas. It rises in extreme northern Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the southern side of the ...