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.
Closer image of the outcrop taken from the side to show how steeply the layers are dipping. The layers seen in this image are dipping to the left sub-vertically. The weathered surface obscures the scale of the layering. A fern pokes out from cracks in the layers.
Finger points to a rock that shows an "S" fold comprised of a band of light minerals within a darker rock.
Finger points to close up of the broken side of a rock which shows light/white minerals layered with dark flat minerals. The layering is on a millimeter scale.
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