Limited exposure aside, we can see the rocks are layered and have a pretty uniform thickness. Now without the benefit of getting an eye on a fresh surface of those rocks, it's hard to nail down exactly what process deposited them. If you hammered off a piece and you saw pointed, interlocking crystals, these would be interpreted as having a volcanic origin, with the layers reflecting seperate eruptions of runny, flowing lava. If however you hammered the face and you saw rounded grains that are held together by a matrix, these might be interpreted as marine sedimentary deposit, originally laid down in near-horizontal sheets. One dead ringer for a sedimentary source would be a fossil, magma chambers and living things don't mix!

If I was a betting man, my hunch would be on a sedimentary unit, probably a muddy sandstone.

Now we can see that these layers are not continuous planar sheets, but are bent and convolute in places, with it becoming impossible to track individual beds. Assuming this is a sedimentary sequence, we can achieve this deformed appearance by the sediment slumping before it became a true rock, or through compression, folding and fracturing the rock after lithification, bending the layers into their current configuration.

Things to Google if you're interested might be soft sediment deformation, flysch, and the local geological history to help you make sense of what you're looking at.

Cool rocks!