EXPLORATORY DRILLING IN THE PRAIRIE DU CHIEN GROUP .
Dolomite, buff, cherry Dolomite, lightgroy, sholy Shale, bluegreen, with thin limestone layers Phosphatic fossil zone at base Dolomite, yellow, thin bedded. shalv Dolomite, buff, thickbedded Receptaculites in lower part Dolomite, graybuff, cherty Receptaculites near base Dolomite,gray,argillaceous Limestone, pink, and