File:The geology of Hardin County, and the adjoining part of Pope County (1920) (14783103025).jpg

Identifier: geologyofhardinc41well (find matches)
Title: The geology of Hardin County, and the adjoining part of Pope County
Year: 1920 (1920s)
Authors: Weller, Stuart, 1870-1927 Butts, Charles, 1863-1946 Currier, Louis W., 1890- Salisbury, Rollin D., 1858-1922 Geological Survey (U.S.)
Subjects: Geology Geology
Publisher: Urbana (Springfield, Illinois State Journal Co., State printers)
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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d nottake place simply along two, continuous faults bounding the two sides of thesegment, but the fracturing and dislocation was exceedingly complicated incharacter. In general the central, longitudinal portion of the zone (beltnumber two, fig. 3) has settled more deeply than the lateral parts, and thetotal dislocation on each side has been distributed among a number of faultshaving a northeast-southwest direction. These faults are not all straightand parallel. In many localities a single fault divides and continues as twowhose directions diverge at a low angle, bounding a narrow wedge-shapedblock which in some places is down-dropped relative to the strata on the twosides, elsewhere on one side only, and in at least one case the rocks on theboth sides of such a block are down-dropped relative to the block itself.Some of these wedge-shaped blocks are also much broken, especially near theirextremities, by shorter faults whose direction is more or less transverse to STEUCTUEAL GEOLOGY 61
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Fig. 3.—Map showing the faults and the structural segments of Hardin County. 62 GEOLOGY OF HARDIN COUNTY the general direction of the longer faults. In some cases two divergingfaults, when traced for some distance, again converge and may becomejoined, in which case they enclose an elongate, narrow block, acutely pointedat each end. The apices of these wedge-shaped blocks are not all uniformlypointed in the same direction, and in some parts of the county there is adistinct intei fingering of the blocks pointing in opposite directions. In the northeastern third of the central faulted zone, the entire area isdivided longitudinally into two belts, while in the southwestern two-thirdsthere are three such belts, the southeasternmost belt at the north becomingthe middle belt toward the southwest. For convenience in discussion, thesethree belts may be designated by the numbers one, two, and three, beginningwith the belt on the northwestern border. The accompanying map (tig. 3)outlines the z

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