 ... and were from 1' to 12' thick. This asphaltum varies greatly in quality; some of it is brownish in color and resembles ironite. It is frequently dry and powdery, and more or less mixed with earth. The best asphaltum in these superficial beds lies...  The Clays and Clay Industries of Wisconsin - Page 224by Ernest Robertson Buckley - 1901 - 304 pagesFull view - About this book
 | Illinois. State Geologist - Geology - 1873 - 734 pages
...Below this geode bed there is usually from thirty to forty feet of cherty gray Hmestone, the layers varying in thickness from a few inches to two feet or more, and separated by partings of shale. The limestone beds consist mainly of the remains of organic beings,... | |
 | S. J. Clarke - Digital images - 1878 - 718 pages
...Below this geode bed there is usually from thirty to forty feet of cherry gray limestone, the layers varying in thickness from a few inches to two feet or more, and separated by partings of shale. The limestone beds consist mainly of the remains of organic beings,... | |
 | Illinois. State Geologist - Geology - 1882 - 622 pages
...Below this geode bed there is usually from thirty to forty feet of cherty gray limestone, the layers varying in thickness from a few inches to two feet or more, and separated by partings of shale. The limestone beds consist mainly of the remains of organic beings,... | |
 | Geology - 1900 - 446 pages
...The best asphaltum in these superficial beds lies near the surface; in some places it forms a stratum varying in thickness from a few inches to two feet or more. This stratum consists principally of a dull-black, compact asphaltum, but some of it possesses a pitch-like... | |
 | William Lord Watts - Natural gas - 1900 - 290 pages
...The best asphaltum in these superficial beds lies near the surface; in some places it forms a stratum varying in thickness from a few inches to two feet or more. This stratum consists principally of a dull-black, compact asphaltum, but some of it possesses a pitch-like... | |
 | Wisconsin Geological and Natural History Survey - Bricks - 1901 - 446 pages
...the southeastern part of St. Croix County on the Chicago, SL Paul, Minneapolis and Omaha Kailroad. About two miles southwest of the village is located...sheets, but are usually folded and broken in such SUPERIOR CHINA CLAY WORKS, MERSEY. PITS FROM WHICH KAOLIN IS MINED. a manner as to lead one to suspect... | |
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