Figure A-3. Photographs of core samples from Trenton and Black River formations in Carter Lauber No. 12, 6-16N-17W. 

1. 4947 ft--Skeletal wackestone from the top of the Trenton. Sample is completely dolomite and ferroan.

2. 4964 ft--Wavy bedded dolopackstone (Trenton). Small recrystallized horn coral at the base of the core piece is filled with ferroan dolomite and anhydrite cement.

3. 4981 ft--Nodular to wavy bedded dolowackestone (Trenton). Crescent-shaped vugs filled with dolomite and anhydrite cement.

4. 5083 ft--Shaly, nodular wacke/packstone with large chert nodule at bottom of sample (Trenton). This interval is 100% dolomite.

5. 5096 ft--Shaly skeletal wackestone with white anhydrite nodule (Trenton). The nodule is lined with ferroan dolomite cement and filled with intergrown anhydrite and calcite.

6. 5109 ft--Shaly mudstone with horizontal fractures reflecting clay content (Trenton).

7. 5171 ft--Burrowed dolomudstone with faint horizontal laminae (Black River).

8. 5179 ft--Shaly, nodular lime wackestone (Black River).

9. 5202 ft--Bryozoan-crinoidal wackestone (Black River). White patches are fractures filled with coarse dolomite. This sample is 100% dolomite.

10. 5223 ft--Stylolitized dolomitic wackestone from the lower Black River. Bryozoan debris and burrows are common.

11. 5228 ft--Bryozoan-rich dolowackestone, nodular appearance due to stylolites (Black River). Small white patches are coarse dolomite.