 | 1901 - 1034 Seiten
...Monongahela formation differed from those of the Upper Coal-measures of Rogers in that they extended from the base of the Pittsburg coal to the top of the Washington coal, or the one succeeding the Waynesburg coal. The important point in connection with... | |
 | Ralph Arnold, Robert van Vleck Anderson - 1907 - 612 Seiten
...used by them as a datum plane. FORMATIONS ABOVE THE PITTSBURG COAL MONONGAHELA FORMATION. The rocks from the base of the Pittsburg coal to the top of the Waynesburg coal are included in the Monongahela formation. This is one of the most important formations... | |
 | Geological Survey (U.S.) - 1907 - 240 Seiten
...used by them as a datum plane. FORMATIONS ABOVE THE PITTSBURG COALMONONGAHELA FORMATION. The rocks from the base of the Pittsburg coal to the top of the Waynesburg coal are included in the Monongahela formation. This is one of the most important formations... | |
 | Geological Survey (U.S.) - 1908 - 42 Seiten
...interval between the coal and limestone is 20 feet or more, it is occupied by fire clay and shale. The distance from the base of the Pittsburg coal to the top of the Pittsburg limestone was measured in 12 different places in the quadrangle, with the results shown in... | |
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Conemaugh beds and it foots up 593 feet 2 inches from the base of the Pittsburg coal to the top of the Upper Freeport seam, which in this hole was found in 641 3 642 9 Depth. 