The dark base of the mountainous thunderheads had a greenish tinge.
It varies in colour from greyish to bright yellow or greenish-brown, the first-named being the purest.
There are other large quarries at Dorset and East Dorset, Bennington county; the finest marbles from this region are the white, slightly marked with pale brown and with greenish lines; they are commonly used for building, the Harvard Medical School and the office of the U.S. Senate being examples.
The Cambridgeshire coprolites are either amorphous or finger-shaped; the coprolites from the Greensand are of a black or dark-brown colour; while those from the Gault are greenish-white on the surface, brownish-black internally.
Impurities render the mineral grey, greenish or reddish, bituminous matter being often present in the massive varieties.
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