When in process of time the chemical forces begin to act upon the siliceous matter diffused through the Atlantic ooze, segregation, or the gathering together of the particles, may take place, and nodules of flint will be the result, similar to the flint nodules which occur in chalk, and the cherty concretions in limestones.
"Geology"
James Geikie
In Arizona chrysotile is found in veins in cherty limestone, associated with diabase intrusives.
"The Economic Aspect of Geology"
C. K. Leith
The cherty limestone strata are thus largely covered, but the next stratum is the clear band of cross-bedded sandstone, which corresponds to the second member of the geological series seen in the arm of the amphitheatre at Maricopa Point, and is from five hundred to six hundred feet wide.
"The-Grand-Canyon-of-Arizona-how-to-see-it"
James, George Wharton