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You are browsing the archive for April 2012 - Page 3 of 3 - Mountain Beltway.

4 April 2012

Slip-shine

When are sedimentary layers also faults? …When the slab-like layers slip over and under one another during the act of folding. Structures traditionally confined to faults show up on the bedding plane in these circumstances. Callan shares a shiny example from West Virginia in the form of an animated GIF.

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3 April 2012

Kink fold in Castner Marble

One more structure from the Castner Marble. This one is clearly tectonically-induced: Top to the left! (East over west)

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2 April 2012

Castner Marble

The Castner Marble is an extraordinary Mesoproterozoic limestone (later re-crystallized and metamorphosed) that exhibits some primary structures (both explicit and ambiguous) and some secondary (tectonic) overprints. It’s exposed in the Franklin Mountains of west Texas.

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