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Has greenish stripes.

I have no idea.

These I have collected in Northeast Ohio.

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The first is a siltstone, and the second is a sandstone. Both are sedimentary rocks formed by hardening of sediments. Mud or silt in the first rock, and sand in the second rock.

The layering in the siltstone can be caused by different minerals in the darker layers (maybe more iron-bearing minerals). The holes in the sandstone are characteristic of weathering in sandstones.

You can see some spectacular examples of similar rocks by searching Google Images for layered siltstone or holes in sandstone.

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  • $\begingroup$ @glennroad don’t forget to accept the answer by clicking the V on the left $\endgroup$ – Gimelist Feb 12 '18 at 20:26

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