arrangement of beds.

The remains of molluscs were specially abundant in parts of the section. The upper beds holding Ostreas while in the lower shell bed I am almost sure I can recognise remains of Paludinas especially of the conical species got last year in the lignite tertiary. If this goes far to confirm the age of these beds as Tertiary. Shows estuarine conditions. See fossils.

16 m. W. of camp exposures belonging to same series & showing purplish Carbonaceous shales, yellowish sandstones & grey sandy clays occur.

Camped about 20 m. West of camp, the East Butte bearing almost exactly S. (Mag) & about 9 miles distant. A dyke of softish green-grey trap with layer [of] crystaline mica here forms a very prominent object. Standing up like a wall as already described. Its general course is N70E on radiant from the highest peak of Butte.

The shales &c. on both sides of it are nearly horizontal & contain numerous ostreas in some layers. Immediately in contact with it however they are much bent & contorted & altered. The dark carbonaceous shales especially are hardened to look like those of the true coal measures. The alteration extends but a very short distance from the dyke.

The whole of the beds seen today probably belong to one formation & that as seen on Milk R. Though so extensively distributed, the whole