Figure A-15. Photographs of core samples from Trenton and Black River formations in Sun Buss-Haab No. 1, 8-3S-4E.

1. 3772 ft--Burrowed-mottled crinoidal wackestone (Trenton).

2. 3810 ft--Burrow-mottled skeletal wackestone from the upper Trenton. This sample is approximately 30% dolomite. Replacive dolomite, which is ferroan, occurs preferentially in the burrowed part of the sample.

3. 3840 ft--Skeletal wackestone with an anhydrite nodule (white patch in upper left) (Trenton).

4. 3879 ft--Crinoidal, brachiopod-rich wackestone (Trenton).

5. 3989 ft--Skeletal wacke/packstone (Trenton).

6. 4029 ft--Bryozoan-crinoid packstone (Trenton). Large arcuate bryozoan frag         ment in lower left part of slab. Fine grains are predominantly crinoid fragments.

7. 4060 ft--Bryozoan-rich, shaly, wavy laminated packstone (Trenton).

8. 4096 ft--Nodular to wavy bedded, shale-rich, burrowed wacke/packstone (Trenton).

9. 4166 ft--Dolomitic nodular mudstone from the lower Trenton.

10. 4172 ft--Mudstone with shale layer at the base (Trenton).

11. 4227 ft--Bioturbated mud/wackestone with dolomite-filled fracture (Black River).

12. 4256 ft--Cherty mud/wackestone from the upper Black River. Small fractures are filled with ferroan dolomite and calcite cement.

13. 4327 ft--Dolomitic burrowed wackestone from the upper Black River.

14. 4375 ft--Dolomitic wackestone with good intercrystalline and fracture porosity (7%)(Black River).

15. 4393 ft--Dolomitic wackestone with fracture lined with dolomite and filled with anhydrite (Black River).

16. 4440 ft--Dolomite mudstone. Small vein is filled with ferroan dolomite cement (Black River).

17. 4506 ft--Burrowed wackestone with small fractures filled with dolomite (Black River).

18. 4525 ft--Nodular dolomitic wackestone with bryozoan debris (Black River).