76 From 72, above 73, along 75 to sk[illegible] 76 are the Cambrian sand- stones in range. These could be followed further but there was no time. It is stated that the Cambrian sand- stones are becoming thicker toward the north, and round grate important slaty chal- members are becoming im- pregnated into the same as the lime conditions are be- coming more pure sand- stone, a fact already sug- gest[illegible] by exposures from 69 to 70.