Bulletin of the United States Geological SurveyThe Survey, 1956 - Geology |
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Page 480
... structure was tested with more than five holes , and some were in- vestigated with only two . In three of the four ... contours drawn on the top of the cherty unit of the Galena dolomite . The downwarp produced by the thinned and compacted ...
... structure was tested with more than five holes , and some were in- vestigated with only two . In three of the four ... contours drawn on the top of the cherty unit of the Galena dolomite . The downwarp produced by the thinned and compacted ...
Page 481
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data * - * * Fence line Structure contours drawn on top of Spechts Ferry shale member of the Decorah formation 0 Datum Contour interval , 5 feet ...
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data * - * * Fence line Structure contours drawn on top of Spechts Ferry shale member of the Decorah formation 0 Datum Contour interval , 5 feet ...
Page 483
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data Contour interval , 10 feet . Datum is mean sea level 500 FIGURE 67. - Geologic structure map and location of drill holes at the Wallis area ...
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data Contour interval , 10 feet . Datum is mean sea level 500 FIGURE 67. - Geologic structure map and location of drill holes at the Wallis area ...
Page 485
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data EXPLANATION 720- Structure contours drawn on top of cherty unit of the Galena dolomite ; revised by drilling data . Contours dashed where inferred ...
... Structure contours drawn on top of cherty unit of the Galena dolomite ; based on outcrop data EXPLANATION 720- Structure contours drawn on top of cherty unit of the Galena dolomite ; revised by drilling data . Contours dashed where inferred ...
Page 486
... Structure contours drawn on top of cherty unit of the Galena dolomite Contour interval , 10 feet . Datum is mean sea level 1000 Feet FIGURE 69. - Geologic structure map and location of drill holes at the Dietz - Schromen area , 2.4 ...
... Structure contours drawn on top of cherty unit of the Galena dolomite Contour interval , 10 feet . Datum is mean sea level 1000 Feet FIGURE 69. - Geologic structure map and location of drill holes at the Dietz - Schromen area , 2.4 ...
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Common terms and phrases
abundant abundant_ argillaceous beds and blue Behnke-Krug area blue beds blue-green brown shale buff C. E. Brown calcite chert is common chert is sparse_ Cherty unit drab clay bed clear calcite Collar elevation dark-brown dark-gray Decorah formation deposits Depth to water dolomite member gray Driller Dubuque County Dubuque subdistrict Durango feet west Ferry shale member finely to medium ft Depth feet Galena dolomite gray chert green shale Guttenberg limestone member hole 1 Location host rock Ion dolomite member Iowa iron content iron sulfide leached white chert light-gray limestone member oil Little Maquoketa River loess Maquoketa shale medium crystalline medium-grained member clay bed member gray beds member oil rock mottled Noncherty unit yellow-sandy Platteville formation pyrite Sample study shale member clay slight limonite staining sparse Spechts Ferry shale sphalerite strata Strike and dip Structure contours drawn study and logging Surficial syncline Total depth vuggy vugs Wallis area zinc and lead Zinc Iron