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.
Fingers point to an exposure of the rock that contains heavily folded millimeter- to centimeter-scale layers of alternating dark and light grains. Grains are too small to see in this image.
Finger pointing to layer of dark micaceous minerals.
Fingers pointing to close up of light grains. They are slightly larger than sand-sized, off-white to white colored. Some light micaceous minerals can be seen interspersed throughout the other minerals.
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