- - First Geological Survey - -
The first official geological survey of the conditions existing in Stark county was made by H. A. Green, under the auspices of the state geological survey, and published in the report for 1870. Mr. Green found that all stratified rocks of the county belong to the coal measures, including all the lower portion of the series from coal No. 7 to Coal No. 2, inclusive. Coal No. 7 was observed in only a few places, the most notable of which was in section 16, township 14, range 7, where S.C. Francis was engaged in operating a mine near the east fork of the Spoon River. A section of the shaft at this mine, as given by Mr. Green, shows the following formation :
Impure Limestone.......0 ft. / 2 in.
Sandstone..............0 ft. / 8 in.
Blue Clay Shale........1 ft. / 4 in.
Yellow Clay............2 ft. / 0 in.
Red Sand...............2 ft. / 0 in.
Clay Shale.............2 ft. / 0 in.
Nodular Limestone......2 ft. / 4 in.
Coal...................2 ft. / 7 in.
Dark Clay Shale........3 ft. / 0 in.
Blue Clay Shale........4 ft. / 2 in.
Dark Clay Shale........5 ft. / 8 in.
Light Colored Clay.....6 ft. / 10 in.
Blue Clay Shale........8 ft. / 0 in.
Blue Clay Shale.......12 ft. / 0 in.
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