Figure A-9. Photographs of core samples from Trenton Formation in Mobil Jelinek-Ferris No. 1, 5-5N-2E. 

1. 6121 ft--Intraclastic, skeletal wackestone.

2. 6132 ft--Shaly wackestone with large, well preserved brachiopod near the center of the sample. Small, closed fractures are filled with calcite. Pyrite replacement of micrite and skeletal debris is common.

3. 6142 ft--Intraclastic wackestone breccia with nodular appearance.

4. 6156 ft--Nodular bedded wackestone.

5. 6166 ft--Shaly, nodular wackestone.

6. 6173 ft--Nodular wackestone with small vertical fractures filled with calcite.

7. 6180 ft--Nodular, skeletal wackestone. Brachiopods and crinoids are common.