June 30 Bkst (3) 3 00 Groceries (3) 1 32 Beer (3) 3 00 Time + Cigars (3) 50 7 82 Went with Doug Black, his ass't Joe Gollick (sp?) and Cox and Dr. Tullis of S.D.S.M. over Blacks area. Highpoints were finding that Blacks "Pierre" extended into Bullhead equivalent; finding T.L. fauna south of Rattlesnake Butte; seeing Pierre + taking samples for Jim. Felt poorly all day. There is a prominent, silty member that weathers like the Trail City in Pierre here - looks to be in lower part Mobridge equivalent-got bxcvlites from top to show Cobban.