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The putative galloanseran bird Austinornis lentus has been found in the Austin Chalk. [2] [3] The general absence of dinosaurs is a reflection of the Austin limestone being marine in origin, primarily composed of microscopic shell fragments from floating sea organisms known as "coccolithophores" (the same organisms that contributed to the White Cliffs of Dover, on the south coast of England). [4]
The Austin formation consists of recrystallized, fossiliferous, interbedded chalks and marls. Exposures of Austin chalk are mainly seen in quarries, roadcuts, and stream beds where the water eroded the top soil. Austin chalk is the well known white rock that the city of Dallas sits on. Volcanic ashes are present in the Austin chalk, and were ...
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.
Austin Chalk, volcanic mounds, and McKown Formation stratigraphic column in Texas. The volcano at Pilot Knob exerted a profound influence on the stratigraphy of the Upper Cretaceous sedimentary rocks of the Austin area. The volcanism occurred during the deposition of the upper part of the Dessau and the Burditt formations of the Austin Chalk ...
Chalk deposits are also found in Cretaceous beds on other continents, such as the Austin Chalk, [13] Selma Group, [14] and Niobrara Formations of the North American interior. [15] Chalk is also found in western Egypt (Khoman Formation) [ 16 ] and western Australia ( Miria Formation ).
Austin Group/Ector Chalk: Cretaceous: Austin Group/Gober Formation: Cretaceous: Austin Group/Gober Chalk: Cretaceous: Austin Group/Pflugerville Formation: Cretaceous:
The Woodbine overlies the Maness Shale, Buda Limestone, or older rocks, and underlies the Eagle Ford Group or Austin Chalk. In outcrop the Woodbine Group has been subdivided into the Lewisville Sandstone, Dexter Sandstone, and/or Pepper Shale formations. [1]
In the mid-1990s, the company unsuccessfully attempted to extend the Austin Chalk play into western and central Louisiana. [5] In 1997, the company wrote down the value of its assets by over $200 million, approximately equal to shareholder's equity at the time, due to low commodity prices and implemented a turnaround plan. [6]