"Residual clay" Quotes from Famous Books
 ... Wisconsin a reddish residual clay has an average depth of thirteen feet on broad uplands, where it has been removed to the least extent. The country rock on which it rests is a limestone with about ten per cent of insoluble impurities. At least how thick, then, was ...
— The Elements of Geology • William Harmon Norton
... vegetation and multitudinous animal life in the Northwest, the waters necessarily became heavily charged with the naturally resulting carbonic acid gas, and this, acting on the limestone rocks, would decompose them, leaving a residual clay and taking the chief portions of the mineral components in solution, to be afterwards deposited according to circumstances and conditions; and these are indicated by the various results found in Wind Cave, Crystal Cave, the Onyx Caves and the Bad Lands. The latter being previous ...
— Cave Regions of the Ozarks and Black Hills • Luella Agnes Owen |
