File:The geology of Hardin County, and the adjoining part of Pope County (1920) (14780751874).jpg

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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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re, in W. i/2 sec. 31, T. 12 S., E. 8 E., many large boulders of a clasticigneous rock were found. Some of the exposures are in place. Their —16 G 242 GEOLOGY OF HARDIN COUNTY distribution suggests an elongated area, possibly 100 feet in width, the longaxis trending northwesterly up the hillside. No contacts are exposed. The material is composed of a highly altered fine-grained matrix carryingfragments of igneous minerals and sedimentary rocks. Under the microscopea texture characteristic of volcanic breccia of the explosive type is displayed.Large rounded sub-angular and angular fragments of sedimentary rocks areembedded in the volcanic (?)matrix, and many of them show metamorphiceffects. The matrix is largely indeterminable, but contains angular fragments ofmica, quartz, acid plagioclase (possibly of about the composition of andesine-oligoclase), microcline and, perhaps, orthoclase. Some of the mineral grainscontain apatite crystals, and zircon(?). The original magma was evidently
Text Appearing After Image:
Pig. 16—Panoramic view of the site of the volcanic plug, half a mile southsouthwest of Sparks Hill, Hardin County, Illinois, in the NE. % NW. % NE. %sec. 13, T. 11 S., R. 8 E. Known area of plug indicated by line. Looking north-west. of acidic type, and this rock may represent an explosive phase of the regionsigneous phenomena. Sparks Hill Intrusion,—South of Sparks Hill, in NE. % sec. 13, T. 11S., R. 8 E., (figs. 16, 17, and 18) are scattered boulders of volcanic breccia sodisposed as to suggest an elliptical area of igneous rock some 200 feet long.1 The rock contains numerous rounded to angular fragments of sedi-mentary rocks, some of which show metamorphic effects. The ground mass isfinely clastic, and under the microscope shows angular and rounded pieces ofquartz, microcline, orthoclase, micas (muscovite especially), and plagioclase.Apatite crystals are found in some of the minerals. Some of the includedrock fragments are apparently aphanitic igneous types. Limestone inclusion

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