File:Annual report of the United States Geological Survey to the Secretary of the Interior (1899) (14763199252).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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as Cut Plain type, consisting of flat-topped mesa divides composed of the hard Edwards limestone withrocky slopes leading down to the streamways, along which may befound a variety of soils upon the diverse belts of successively out-cropping geological formations. GEOLOGY. The Cretaceous formations constitute all the surface rocks of thecounty with the exception of the alluvial deposits which veneer thebroad, flat terraces in the streamways. The formations exposed inthe county in descending series from east to west are those of theWashita and Fredericksburg divisions, and the Glen Rose formationof the Trinity division. West of the Santa Fe Railway and north ofMeridian Creek, in the district of the Lampasas Cut Plain, the highdivides are all composed of the Edwards limestone, beneath which theWalnut, Paluxy, and Glen Rose formations constitute slopes leadingdown to the Brazos on the north and the Bosque River in the cen-tral portion. The Brazos Valley, in the extreme northern portion of
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• LlbHAHy lLUNOls HILL.J ARTESIAN CONDITIONS IN BOSQUE COUNTY. 481 the county, and the Bosque River and Duffau Creek in the portionwest of Iredell, are underlain by the Glen Rose formation. The valleyof Steele Creek, below Walnut, and the valleys of the Bosque and theEast Bosque from the junction of the East and West forks almost tothe southern border of the county, are underlain by the Walnut for-mation. The high divide of the Brazos, the Bosque, and the portionof the county south of Meridian Creek show the Fort Worth lime-stone and other formations of the Washita division and the Edwardslimestone at the surface. The Paluxy sands outcrop in an uplandforest area below the summits of the slopes of the Chalk Mountaindivide, in the northern portion of the county, and on the Johnson Peakdivide south of Iredell. These sands become embedded near the junc-tion of the Bosque and East Bosque rivers, and near Kimball, on theBrazos. (See fig. 48.) WATER CONDITIONS. The chief and most available

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