Iron ores, salt and sandstones . is report gives the resultsof his investigation and study of the Martinsburg shale or socalled slate (Bulletin No. 275, pp. 119-122). On account of the great interest which was taken inthis shale as a slate proposition, and the fact that a numberof the people who own these slate farms still hope to see thisindustry opened, it has been deemed advisable to reprint contribution in this report. While the. investigationcondemns the shale as a slate proposition, it must be remem-bered as explained in detail in Volume III that this shalewill form a valuable a
Iron ores, salt and sandstones . is report gives the resultsof his investigation and study of the Martinsburg shale or socalled slate (Bulletin No. 275, pp. 119-122). On account of the great interest which was taken inthis shale as a slate proposition, and the fact that a numberof the people who own these slate farms still hope to see thisindustry opened, it has been deemed advisable to reprint contribution in this report. While the. investigationcondemns the shale as a slate proposition, it must be remem-bered as explained in detail in Volume III that this shalewill form a valuable addition to the mineral wealth of thisarea in connection with the adjoining limestone for Portlandcement manufacture. THE MARTINSBURG SHALE OR SLATE IN WEST VIRGINIA. By T. NELSON DALE. (A reprint of article from Bulletin 275 of U. S. Geological Survey.) This recently prospected slate district lies near Martins-burg, in Berkeley County, within the geological belt desig- 1. By McCreath quoted by Dale, U. S. G. S. Bull. 275, p. Contour interval 100 feet Fig. 13. Map of slate region about Martinsburg (Loaned by U. Survey). Shading represents area underlain by Martins-burg shale. Slate quarry is shown by crossed hammers; slate pros-pects by round dots; strike of commercial slate by arrow. 394 MARTINSBURG SHALES AS A SLATE PROPOSITION. nated in the Harpers Kerry folio of the United States Geo-logical Survey as Martinsburg shale. Brief preliminarynotices of it have appeared in Bulletin No. 213 (p. 363) andagain in Bulletin No. 260 (p. 538). This belt lies about 13miles west of the Blue Ridge and mostly on the western sideof Opequon Creek, a small tributary of the Potomac. Itmeasures at least 14 miles in length from north-northeast tosouth-southwest and from 2 to 3 miles in width. The ac-companying map (fig. 13) shows the geological relations andthe principal outcrops. This shale and clay-slate formation,estimated at from 700 to 1,000 feet in thickness, is of Ordo-vic
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