I can no Stromatoporas in zone D neither in the southern or northern lime quarry but along the middle of the escarp- ment on the C. R. N. R. they abound in this gone through a thickness Perhapsly 13 feet. Zone C is the real Stromatopora horizon being most abundant here but com in this zone at the southern end of the cut they are rare or absent. Zones C and D towards the north are separated by from 1 to 4 inches of a black bituminous shale and here zone D has other black shale bands. At the very top of the cutting along the middle in gone A can be seen several large Geonularias which Helman take the base of the Geonularia beds of Grindleys. The dip is quite irregular. In the O.&E. quarry it is towards the N.W. quarry while in the upper end of the latter the strata again size. It is probably these undulations and the rapid lithological change which the Hamilton undergo