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  2. Caverns of Sonora - Wikipedia

    en.wikipedia.org/wiki/Caverns_of_Sonora

    The cave is formed in 100-million-year-old Segovia Limestone, of the Edwards Group. The formation of the cave itself probably occurred between 1.5 and 5 million years ago. The cave is formed primarily along joints, which allowed gases to rise up from depths of around 1.5 mi (2.4 km) to then depths of about 300 ft (91 m).

  3. Eagle Ford Group - Wikipedia

    en.wikipedia.org/wiki/Eagle_Ford_Group

    Eagle Ford stratigraphic column Outcrop of the Eagle Ford and Austin Chalk Contact off Kiest Blvd, 1/2 mile east of Patriot Pky in Dallas County. The Eagle Ford Group (also called the Eagle Ford Shale) is a sedimentary rock formation deposited during the Cenomanian and Turonian ages of the Late Cretaceous over much of the modern-day state of Texas.

  4. Geology of Texas - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Texas

    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 ...

  5. Geology of the Dallas–Fort Worth Metroplex - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Dallas...

    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 ...

  6. Geologic temperature record - Wikipedia

    en.wikipedia.org/wiki/Geologic_temperature_record

    500 million years of climate change [7] The Phanerozoic eon, encompassing the last 542 million years and almost the entire time since the origination of complex multi-cellular life, has more generally been a period of fluctuating temperature between ice ages, such as the current age, and "climate optima", similar to what occurred in the ...

  7. Paleontology in Texas - Wikipedia

    en.wikipedia.org/wiki/Paleontology_in_Texas

    Acrocanthosaurus.. Archaeologist Jack. T. Hughes has found evidence that the paleo-Indians of Texas collected fossils. [20] After the establishment of paleontology as a formal science, in 1878, professor Jacob Boll made the first scientifically documented Texan fossil finds in Archer and Wichita counties while collecting fossils on behalf of Edward Drinker Cope.

  8. Million years ago - Wikipedia

    en.wikipedia.org/wiki/Million_years_ago

    The "ago" is implied, so that any such year number "X Ma" between 66 and 145 is "Cretaceous", for good reason. But the counter argument is that having myr for a duration and Mya for an age mixes unit systems, and tempts capitalization errors: "million" need not be capitalized, but "mega" must be; "ma" would technically imply a milliyear (a ...

  9. Geology of North America - Wikipedia

    en.wikipedia.org/wiki/Geology_of_North_America

    The Colorado Plateau is a stable region dating back at least 600 million years. As a relative lowland, it had been a site of deposition for sediments eroded from surrounding mountain regions. [38] Then, during the Laramide Orogeny, the entire plateau was uplifted until about six million years ago. Erosion during and following the uplift removed ...