Figure A-7. Photomicrographs of thin-sections of core samples from Trenton and Black River formations in Carter Lauber No. 12, 6-16N-17W. 

A. 5976 ft--Skeletal wackestone from the upper Trenton. Black patches are pyrite replacing ferroan dolomite and brachiopod debris. PPL.

B. 6373 ft--Peloidal wacke/packstone with scattered trilobite, brachiopod, and crinoid fragments (Black River). PPL.

C. 6375 ft--Stylolite with a concentration of dolomite in a wacke/packstone(Black River). PPL.

D. 6375 ft--Wacke/packstone with abundant peloids and common skeletal fragments(Black River). PPL.