The building and decorative stones of Maryland, containing an account of their properties and distribution (1898)
Merrill, George P. (George Perkins), 1854-1929, Mathews, Edward Bennett, b. 1869 · Baltimore, Johns Hopkins press · leaf 19
re is not too much preliminaiT stripping(PlatelY Fio- 1). When, however, the beds stand at high angle,or are exposedonly in a hillside, quarrying must be carried on eitheron a highly inclined floor, as in the quarries of gneiss north and westof Baltimore, or directly across the edge of beds,… … Pjp 5—Diagram showing relation between thlcliness and exposure of beds. lie horizontally it is obvious that the character of any but the upper-most beds can be ascertained only by investigation in hi Isides andalong the banks of ravines. Where they are highly mclmed, it isin inanv instances…
Stone · Building stones
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