This week’s Friday Rocks is a prograding delta deposit from Owen’s Valley. The steeply dipping beds mark the edge of the delta building out into the lake floor.
I snapped this photo of the Carlsbad fault when we stopped on our way to Carlsbad Caverns. Up close, one of the beds in the hanging wall is oolitic.
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Stylolite in micrite. From the Permian Reef Geology Trail, West Texas. Debris flow deposit with fossil fragments is seen in the beds above the micrite muds.
This outcrop comes from near one of Quebec’s great asbestos mines. The brown rock is an ultramafic rock composed mostly of olivine called Dunite. The minerals which precipitated in the fracture across the diagonal of the photo are serpentine and asbestos. These minerals grew perpendicular to the direction of opening.
Do you have cool outcrop photos? Submit one and a short description / interpretation to be featured in Friday Rocks!