Pg. 374, 379. Bull Creek sandstone in Strawn division. Sandstones, largely in flaggy layers 6 inches to 4 feet thick; white on fresh surfaces, weathering grayish. Thickness 50 to 75 feet. Member of Strawn division [Strawn is 2nd from base of 5 Carboniferous divisions of Cummins, 1891]. Overlies Horse Creek clays and shales and underlies Big Valley bed. Age is Pennsylvanian.
[Named from Bull Creek, Mills Co., Colorado River region, central TX.]
Source: US geologic names lexicon (USGS Bull. 896, p. 290).
Pg. 72. Bull Creek sandstone in Strawn series. Largely white flaggy layers, weather grayish. Thickness 50 to 75 feet. Underlies Big Valley bed; overlies Horse Creek clays and shales. [Age is Pennsylvanian; age of Strawn not discussed.]
[Report area in Parker County, central Texas.]
Source: US geologic names lexicon (USGS Bull. 1200, p. 527); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).
Pg. 58, pl. 27. [†Bull Creek sandstone in Strawn formation not used by the USGS; a local term considered obsolete. See also entry under Strawn.] Drake (1893) separated rocks of Strawn group [division] into 20 units of alternating sandstone and shale beds. He gave local names to these units, or "beds" as he termed them, and numbered them from bottom to top, 4 to 23. Only Drake's name for upper unit, the Ricker, is in common use today, and that name has been restricted to the base of Drake's Ricker bed.
Source: US geologic names lexicon (USGS Bull. 1200, p. 527).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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