. Elements of geology : a text-book for colleges and for the general reader. Geology. 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).. Fig. 453.—Section of Appalachian Coal-Field, Pennsylvania, showin
. Elements of geology : a text-book for colleges and for the general reader. Geology. 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).. Fig. 453.—Section of Appalachian Coal-Field, Pennsylvania, showing Effects of Erosion on Gently- Undulating Strata (after Lesley). By means of the rule for identifying seams given above, it is often easy to trace the same seam from one basin to another, or from one mountain-side to another, with great 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
