Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 248
cepting that it is composed offragments of corals. Chalk is a fine white limestone composedlargely of the minute shells of foraminifera. Magnesian Limestones; also called Dolomitic Limestones.—Under this head are included those limestones which contain10 per cent and upwards of carbonate of… … Mai* Showing Areas of Marble in the Eastern United States. To /act fiagt *w. LIMESTONES AND DOLOMITES: MARBLES. 203 they can usually be distinguished only by chemical tests. Manymarbles are magnesian, as will be noticed by reference to thetables. When the carbonate of magnesia in a limestone…
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