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2016-01-04 16:32:10 Post No. 7761799
Post No. 7761799
Can any geologybros help me identify this rock? I'm only a first year so I don't know shit.
It has well-defined layers that go all the way through and it's partially coated in what I think is bitumen (or whatever it is they stick roads together with) and I found it on the way into a field that had been surfaced with broken chunks of tarmac. There were other similar rocks nearby.
I gave it a few whacks with my hammer and the rock didn't break and sparked once. The fracture looks vaguely conchoidal but without the arcs you'd see on flint. Couple more pics through my hand lens to come