What kind of rock is this? What unit is it part of?

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Finger points to a rock in which three primary types of minerals can be seen: 1) small millimeter-sized black grains showing parallel orientation, 2) white grains that vary in size from millimeter to centimeter and occur in weakly defined bands throughout the rock, and 3) round, red, millimeter to centimeter-sized grains occurring throughout.
A small diagram showing the stratigraphic relationships of different rock units within the field site. The top unit is the Loch Raven Schist. Under the Loch Raven Schist is the Cockeysville Marble. Underneath the Cockeysville Marble is the Setters Formation. Under the Setters Formation is the Baltimore Gneiss.
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