. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. ina The Shepherdstown cement had a tensile strength neatwithout sand of 50 pounds in one day and 300 pounds in 28days, and was slow setting. Its strength was equal to the bestgrades made in this country. Quarry.—The cement rock forms a bold bluff along thePotomac River across the county road from the mill. Thelimestone belongs to the Elbrook Formation and stands nearlyvertical with a height of 125 feet. The quarry-face is 57 feetacross, but 15 feet is rejected a
. Jefferson, Berkeley, and Morgan counties, by Grimsley, assistant geologist. White, state geologist. ina The Shepherdstown cement had a tensile strength neatwithout sand of 50 pounds in one day and 300 pounds in 28days, and was slow setting. Its strength was equal to the bestgrades made in this country. Quarry.—The cement rock forms a bold bluff along thePotomac River across the county road from the mill. Thelimestone belongs to the Elbrook Formation and stands nearlyvertical with a height of 125 feet. The quarry-face is 57 feetacross, but 15 feet is rejected as too pure for Natural one place is a six-foot ledge which burned to a hard clinkerand so was not used and was named by the quarrymen thegreen rock. The exposure of vertical cliff runs for a mile andcontains rock of varying composition in the different ledges,so that only certain portions could be used for this cement. Aainonni of material has been quarried, but there is an Shepherds- Louisville, town Rosendale Ky. ^ Pm WEST VIRGINIA GEOLOGICAL SURVEY. 497 almost unlimited amount left that is suitable for the manu-facture of Natural cement but this industry has been so greatlydisplaced by use of Portland cement that it is very doubtful ifthis limestone could now be worked with any great profits. The composition of the limestone ledges near this mill isshown in the following Survey analyses: No. 51 No. 53 No. 106 No. 107 No. 111 No. 112 Lime carbonate Magnesium carbonate. Silica Alumina Iron oxide , 2 06 ..63 Alkalies Titanium Phosphorus No. 51 is from the ledge of so-called green rock near the old mill,which is said to burn to a good Natural cem
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeology, bookyear1916
