sombre clays occur at intervals all the way & prove their contiuity. In some places they hold a good deal of selenite. The same absence of thick lignites characterizes sections seen about traders road & may indicate the edge of the basin in that direction, nearly following the Coteau.

June 30. Engaged writing up diary & Geological notes. Packing specimens & changing paper of plants.

Sent off letter this morning to P. by Howard the American Expedition scout who is going to Ft. Peck on the Missouri. He has not yet heard anything of the arrival of the party in these regions & goes to enquire as to their movements. They seem rather behindhand.

Camp

8 A.M.

B. 27.10

T. 67

Clear & fine.

Noon

27.06

76

Fine Small Cum. clouds of

8 P.M.

27.08

64

Fine Calm Cloudless.

July 1. Morning & evening engaged getting specimens packed & put in order. Afternoon rode out with Nilson down the valley fossil hunting.

Geol: By carefully examining the sections of sombre clays in the valley found a good many fossils, clearly proving Cretaceous age of beds. Found many bacculites, one ammonite, & several smaller forms. They occur in connection with the nodular layers of ironstone which are frequent. They are generally imbedded in the stone. The fossils often crushed but sometimes perfect. Bacculites filled with ironstone but retain pearly lustre of shell.

Seems certain that these clays & portion D of sect. of 29th June, are the same & that top of Cretaceous must lie at top of D or in yellow sands above it.

The difference of level between camp on creek 10 m. E. of here & this place by comparison of Barometric readings = 0.14 or about 127 ft.

The top of the sombre clays being above the first mentioned clays &