File:Annual report of the United States Geological Survey to the Secretary of the Interior (1899) (14576863469).jpg

Identifier: annualreportofun2171geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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in that direction and the eastern portions moresteeply inclined. The dip of the rocks of the Fredericksburg divisionfrom west of Weatherford to Fort Worth is approximately 24 feet tothe mile; east of Fort Worth the angle increases to 40 feet to themile. Throughout the Lampasas Cut Plain between the Brazos and theSan Gabriel, where the dip of the Edwards limestone coincides withthe summit regional slope, it averages about L7.5 feet to the mile.Below the Edwards limestone the Basement Trinity beds have a greaterdip. as will be presently shown. Along the western margin of theBlack Prairie region, along the more acutely faulted portion of theBalcoues fault zone, the aggregate dip or downthrow of the rocksincreases to over 100 feet to the mile, being estimated at 110 feet inthe Austin section. The Basement sands in the same region as the overlying beds havea greater inclination, proportionate to the constant increment of theGlen Rose beds. Furthermore, the dip of the beds of the formations
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HILI..) ESTIMATED DIPS OF STRATA. 379 below the Edwards limestone everywhere differs slightly from that ofthe overlying beds, owing to the wedge-like increase in thickness ofthe Glen Rose strata. The following table will show some of the estimated dips of all thestrata, including and above the Fredericksburg division, in proceedingsouthward. The figures given are subject to correction. Table showing dip alone/ various cross sections. Lampasas Cut Plain and GrandPrairie.a Weatherford to Fort Worth Round Mountain, Comanche Co.to Valley Mill?, Bosque Co.... West of Waco Goldthwaite to Townsends Mills West of Bejton West of Georgetown West of Austin Dip permile. Feet.24-27 17.117. 616.7 1718 13.5 Black Prairie. Arlington to Dallas . Keller to Dallas Mansfield to PalmerBritton to Corsicana Waci < to Marlin East of Belton East of GeorgetownEast of Austin Dip permile. Feet.42.1 41 4041.4 426 706 50 -6 70 a These dips are calculated from the altitudes and depths of the strata at the points

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