At Cataract, Dundas, Hamilton and Story Creek the upper horizon in the midst of the rd. bygro beds are characterised by small bivalves. The latter are also present at the same level at Niagara Falls so that they range geographically all the way from N. F to at least Cataract. Farther northwest more and limestone is developed and the bivalves drop out. An Althaea planocoxa holds the horizon gjust above the sandstone and has a range of not more than 15 feet. At times they look much like Ctypra reticulata and this is particularly true at Story Creek. Cornulites is especially common at Story Creek. Plectambonites is common only at Story Creek and Hamilton, and not or at the former place. Some day someone will get a large crinoid. The stems look almost like those of Mariacrinus. There are also other species of crinoids.