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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.
The East Texas iron ore belt spans several counties, including Cherokee, Upshur, Camp, Gregg, Harrison, and others. The geology of the region is dominated by the Weches greensand, which consists of glauconitic sand and clay. This greensand is underlain by various sedimentary formations, including the Queen City sand member and the Sparta sand.
The Interstate Highway System in Texas covers 3,233.4 miles (5,203.7 km) and consists of ten primary highways, seven auxiliary highways, and the splitting of both Interstate 35 (I-35) and Interstate 69 into multiple letter-suffixed branches. The Interstate Highway with the longest segment in Texas is I-10 at 880.6 miles
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 Texas State Highway system was established in 1917 to create a structured network of roads that would enhance connectivity and support economic development across the state. The initial system included 22 state highways, many of which followed pre-existing trails and trade routes.
Later, the Texas Speleological Association mapped the cavity, and the Texas highway department sealed the hole and completed the Interstate. [ 9 ] In 1975, a two-mile (3.2 km) set of elevated express lanes were added to I-35 between 15th Street and Airport Boulevard. [ 10 ]
Cretaceous Formations of the Dallas-Fort Worth Metroplex Geologic map and the labeled geologic formations that lie directly beneath the surface in Dallas County Cretaceous formations of Texas Where the DFW Metroplex was located during the last super continent known as Pangea Placement of Tectonic Plates and DFW location around ≈94 million years ago The Cretaceous rocks in the DFW Metroplex ...
U.S. Highway 75 (US 75) is a part of the U.S. Highway System that travels from Interstate 345 (I-345) in Dallas, Texas northward to the Canadian border in Noyes, Minnesota. In the state of Texas it runs from I-345 in Dallas and heads north to the Oklahoma state line, a distance of about 75.3 miles (121.2 km).