Preliminary Report Upon Petroleum And Inflammable Gas
Preliminary Report Upon Petroleum And Inflammable Gas
Ohio. Chief Geologist
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It is a great storehouse of most interesting fossils, almost all of which occur as internal casts. It has a maximum thick- ness in outcrop of 150 to 200 feet. It occupies all of the surface of north- ern Ohio that is assigned to the Niagara. It is generally light-colored, drab or cream in tint, but is sometimes blue. A mass of clean, sharp sand, BO feet in thickness, that occurs in the Niagara series in southern Ohio, is known as the Hillsboro sandstone, and does not need further description he...re. At some points in the State the Niagara is highly bituminous, the asphaltic matter being distributed throughout the substance of the lime- stone. 5. THE SALINA SHALES. This is an e^ment of small value at most, in the Ohio scale. There is a question whether any distinct boundaries can be assigned to beds of this age. The last named group may have been formed in part in the Salina epoch. 6. THE WATERLIME OR LOWER HELDERBERG LIMESTONE. The great sheet of thin and even-bedded light-brown or drab, or some- times blue magnesian limestones, poor in fossils, but rich in bituminous compounds as petroleum and asphalt, that is found directly overlying the Niagara series, and that constitutes the surface rock for not less than 4,000 square miles of the State, is known in geology by the ill-chosen and misleading designation, the waterlime.
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