22 November 2014

Stylolites in Helderberg crinoidal grainstones, Corridor H

Posted by Callan Bentley

Long week, no blog.

But, hey – it’s Saturday, and I have a couple of hours of breathing room – so here are some stylolites in a crinoidal grainstrone in the New Creek member of the Helderberg Formation, exposed on Corridor H in West Virginia.



Stylolites are pressure solution features, which overall form perpendicular to the maximum squeezing direction (maximum principal stress direction, σ1), and have little wiggle peaks that point in the maximum stress direction. So when a geologist sees this…


…they interpret it this way: