This afternoon I made as careful search of the Mancos formation outcrops as possible and found the following. Beginning with the Rochwood quartzite the formation alone (like seen at Mr. [illegible] five spring) lies with a crassly arenaceous limestone charged with traces of Tarsets. One finds these cores on the surface indicating a thickness of about 15 feet. At about 30 feet from base occur the Chinotopora shale mixed up with the cores. Probably at about the same horizon or a little lower occur the Oniotella. These [illegible] near the above mentioned spring found in a little abandoned quarry which can hardly be more than 30 feet above the quartzite showing here. The fine-grained are- aceous sandstone in one place is followed at once by the Chattanooga and at another after about 15 feet of an orange rim stained sandstone which is evidently the same as