What kind of rock is this? What unit does it belong to? 

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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.
Broken bits of rock that show layers of dark minerals and layers of light minerals alternating.
Close up of the dark and light layering in the rocks. Finger points to light layer which contained white minerals. The dark minerals in the other layers show clear parallel orientation.
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