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.
Hand points to rock showing light and dark bands of minerals. A slight folding can be seen in the bands.
Hand points to a portion of the outcrop that looks similar to stair steps with light/dark banding visible and multiple planar surfaces exposed.
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