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Fresh marlstone, outcrop “Q”. The grey surface is a thin weathering skin that has formed since the road cut was excavated in the late 1970’s. Beneath the skin, the rock is black (see broken corner) and exudes a petroleum odor.
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Fresh marlstone, outcrop “Q”. The grey surface is a thin weathering skin that has formed since the road cut was excavated in the late 1970’s. Beneath the skin, the rock is black (see broken corner) and exudes a petroleum odor.