Bulletin of the Geological Society of America . Figure 11.—Seas and Goal Swamps of early Pennsylvanian TimeShading indicates areas of greatest subsidence. 224 C. SCHUCHERT THE NORTH AMERICAN GEOSYNCLINES. Figure 12.—Cordilleran, Mexican, and FranMinian Geosynclines; Mississip-pian Sea and Coal Swamps of late Pennsylvanian Time Shading indicates areas of greatest subsidence. ILLUSTRATIONS 225

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890