"Ash-grey" Quotes from Famous Books
 ... easily in a white glass; and this I may add is a very general character with all the sedimentary beds in the Cordillera: although this rock when broken is generally quite black, it everywhere weathers into an ash-grey tint. Between these two great masses [Q and S], a bed [R] of gypsum is interposed, about three hundred feet in thickness, and having the same characters as heretofore described. I estimated the total thickness of ...
— South American Geology - also: - Title: Geological Observations On South America • Charles Darwin |
