cj - usgs · 2019. 6. 6. · webb, 1962). the effectiveness lies in the fact that key indicator...
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DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY
88°37'30" EXPLANATION
~ Pennsylvanian, probable Abbott Formation. ~ Sandstone, tan to reddish, medium to fine
grained, minor siltstone and shale, cross-bedded or ripple-marked in places
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INrERIOfl-G EOLO GICAL SURVEY, RESro~. IJA - 19B.5
For sale by Branch of Distribut ion. U.S. GeolDgical Survey, 1200 South Eads Street, Arli~n. VA 22202
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