Figure A-13. Photomicrographs of thin-sections from core samples from Trenton Formation in Consumer Power Company No. 219, 17-1S-8E.

A. 4051 ft--Dolomite packstone. Coarse, baroque dolomite rhombs, with clear rims, fill a small vein. Fine-grained dolomite is on the wall of the fracture. CN.

B. 4078 ft--Calcite-filled vein (dark gray) in a dolomite packstone (light gray). Vein is lined with dolomite and filled with calcite. Partially crossed nicols.

C. 4250 ft--Small pore (p) in a vug nearly filled with calcite. Xenotopic dolomite surrounds the vug. PPL.

D. 4250 ft--Interlocking mosaic of dolomite with "ghost" of unidentifiable fossil in the center. PPL.