|   | 
| Unit No. | Description | Thickness |  
| 1 | Gray shale |  |  
| 2 | Granular crinoidal limestine, poorly shown | 8 ft. |  
| 3 | Blocky and shaly sandstone, poorly shown | 45 ft. |  
| 4 | Massive sandstone | 20 ft. |  
| 5 | Erosion remnants of Winterset up to 1/2 fto., brown crystalline limestone | 0.5 ft. |  
| 6 | Black, fussile shale (Stark) | 2 ft. |  
| 7 | Gray shale | 0.5 ft. |  
| 8 | Bluish-gray, fine limestone with Marginifera | 2.5 ft. |  
| 9 | Shale |  |  |