What type of rock is this? What unit is it a part of? 

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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 densely layered rocks in the outcrop, covered in moss and leaves. The rocks dip to the left of the image. The layers are thin, millimeter to centimeter scaled. There are no freshly exposed surfaces to see.
Closer image of the rocks showing the millimeter-to-centimeter scaled layered which are highly weathered and cut with some veins of what appear to be less weathered minerals that seem to be within the layers and parallel to them.
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