Tax week has been a pretty busy one for me with grading and other meatspace commitments. As I catch up on Deskcrops for the week there’s a theme that geologists will recognize that relates to an earlier blog post. Nuf said.
I’m kicking the week off in the chlorite zone. Today’s deskcrop is Ellsworth Schist, a Cambro-Ordovician rock unit cropping out in coastal Maine near Mount Desert Island. This rock unit has experienced quite a bit of deformation but appears to have only been heated to a point such that chlorite is the highest grade metamorphic index mineral present.
Tomorrow we’ll visit the biotite zone…
Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!