Preliminary Report Upon Petroleum And Inflamable Gas
Preliminary Report Upon Petroleum And Inflamable Gas
Geological Survey of Ohio
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contrasted with the brown color of the latter. These colors are not, however, constant and it is generally impossible to establish sharp boundaries underground on this basis. 6. The Waterlime or Lower Helderberg Limestone. The facts developed by the drill in regard to this formation are entirely unexpected. It has been found to have a maximum thickness equal to the combined thickness of all the other lime- stones with which it is associated. The breadth of its outcrop ought to have shown us tha...t there was a greater body of it than we had provided for in our sections ; but heretofore it has been supposed that we were dealing fairly in assigning to it a total thickness of loo feet. Instead of that, we are now sure that it has a thickness of at least 500 feet, and very likely a maximum thickness of 600 feet. The *'Salina Group,** as it now appears, is to be absorbed in it and must disappear from the scale, so far as any series in Ohio geology having a distinct boundary is con- cerned. The plaster beds of Gypsum and of the islands of Lake Erie, which have been heritofot^ referred to the Salina Group, be- long at about the middle of this great series.
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