have been prepared expressly for the dissemination of that information bearing upon the proposed new water supply, that will be useful, as well as interesting, to the citizens of Cincinnati at this particular time. These subjects have their respective bearing on our water supply,--that of the geological structure being especially important, because we learn from it a more accurate knowledge of our subterranean resources; of the impossibility of infiltration of the Ohio River waters, and of the formation and availability of our water-sheds.
(Arranged from the Ohio State Geological Reports, 1873.)
===============+=============+==========================+=========== SYSTEM. | GROUP. | STRATA. | THICKNESS | | | IN FEET. ---------------+-------------+--------------------------+----------- | | { Delta sand. } | Quaternary. |Drift. | { Forest bed. } | 200 | | { Erie clay. } | | | | |Coal. | { Upper coal measure. } | -- | | { Barren “ } | | | | |Measures. | Lower coal measure. | 1,200 +-------------+--------------------------+------------ Carboniferous. |Conglomerate.| Conglomerate. | 100 +-------------+--------------------------+------------ |Lower carb. | Chester limestone. | 20 |Limestone. | | +-------------+--------------------------+------------ |Waverly. | { Cuyahoga shale. } | -- | | { Berea grit. } | | | | |Group. | { Bedford shale. } | 500 | | { Cleveland shale. } | ===============+=============+==========================+============ Devonian |Erie. | Erie shale. | 400 | | | |Huron. | Huron shale. | 300 | | | |Hamilton. | -- | 20 | | | |Corniferous. | { Sandusky limestone. } | 100 | | { Columbus “ } | | | | |Oriskany. | Oriskany sandstone. | 10 ---------------+-------------+--------------------------+----------- Upper Silurian.|Helderburg. | Water lime. | 100 | | | |Salina. | Salina shale. | 40 | | | |Niagara. | { Hillsboro sandstone. 30| } | | { Niagara limestone. 180| } 275 | | { Niagara shale. 60| } | | { Dayton “ 5| } | | | |Clinton. | -- | 50 | | | |Medina. | -- | 20 ---------------+-------------+--------------------------+----------- Lower Silurian.|Cincinnati. | { Lebanon beds. } | | | { Eden shales. } | 1,000 | | { Mt. Pleasant beds. } | | | | |Calciferous. | { Calciferous } | 475 | | { Sand rock. } | | | | |Potsdam. | Potsdam sandstone. | 300 ===============+=============+==========================+===========