Name:  Dolomite Marble

Geologic Name:  Inwood Limestone

Reference:  Dana, J.D., On the geological relations of the limestone
belts of Westchester County, New York: Am. Jour. Sci. 3rd ser. vols.
20, 21, 22, 1890.

Microscopic characters:  The slide is composed of a mosaic of dolomite
grains showing twinning lamellae and some have the crossed twinning
bands.  Elongated sections of phlogopite are colorless under the
microscope.  There are a few small pyrite grains.