and irregular outcrops all the older rocks, Clarke lays it down as "Leronno-Carmino fauna" because the Iockie sandstones contain our plants as young as the Archaeopteryx plana. There must therefore have been decided mountain making here in Middle Ordovician time, resulting locally in the thick Appalacian and in the Middle Appalachians thrift of the 10,000 feet of Hamilton and the tousands of feet of Chemung shales and sandstones. Did not collect Didymogyra at Pierce Rock spent a good deal of time about the south around Mt. Joli. At the swamp one has light evan and calcareous shales with fern fossils, there we saw Didymogoptus, Remplerids (platella, which), crinits shunns, Cyclospina biculata. This then is the Atlantic fauna of middle Ordovician time. These same strata strike through Mt. Joli and come out on the other side. The strata of Mt. Joli itself are greenish shales and hardnited calcareous strata and are stand on edge. Clarke calls them Rilegian