. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 451.—Section of Panther Creek Coal-Basin (after Ashburner). times dipping at all angles, and folded in the most complex manner. In the Appalachian region, especially in the anthracite region of North- ern Pennsylva- nia, the strata are very much dis- turbed, and the coal-seams inter- stratified with them are often. Fig. 452.—Illinois Coal-Field (after Daddow). nearly perpendicular (Fig. 451), while in Illinois and Iowa the coal- strata are nearly or quite horizontal (Fig. 452). But, whether horizon- tal,
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 451.—Section of Panther Creek Coal-Basin (after Ashburner). times dipping at all angles, and folded in the most complex manner. In the Appalachian region, especially in the anthracite region of North- ern Pennsylva- nia, the strata are very much dis- turbed, and the coal-seams inter- stratified with them are often. Fig. 452.—Illinois Coal-Field (after Daddow). nearly perpendicular (Fig. 451), while in Illinois and Iowa the coal- strata are nearly or quite horizontal (Fig. 452). But, whether horizon- tal, or gently folded, or strongly plicated, in all cases denudation has carried away much of the upper portions, leaving them in isolated patches as mountains or basins, as shown in the map of Northern Penn- sylvania (Fig. 454) and in the section (Fig. 453).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
