“Mineral Production in Illinois in 1959,” Circular 300 (no charge), is one of a series of annual economic summaries. “Caves of Illinois,” Report of Investigations 215, price 50 cents, will be available by September 1961.
Illinois State Geological Survey Educational Series 7
24 pages, 1 plate, 12 figures, 1961
Illinois State Geological Survey, Urbana Educational Series 7—Plate 1—North
Illinois State Geological Survey, Urbana Educational Series 7—Plate 1—Central
Illinois State Geological Survey, Urbana Educational Series 7—Plate 1—South
GEOLOGIC MAP OF ILLINOIS showing BEDROCK BELOW THE GLACIAL DRIFT 1961 KEY T Tertiary (Pliocene omitted) K Cretaceous P² Pennsylvanian (Above No. 6 Coal) P¹ Pennsylvanian (Below No. 6 Coal) P³ Pennsylvanian (Above No. 6 Coal) M² Mississippian (Upper) M¹ Mississippian (Middle and Lower) D Devonian SD Silurian and Devonian S Silurian O Ordovician C Cambrian F Fault OSDM Complex faulted area Physiographic base map by James A. Bier Price, 25 cents