The Devonian limestone is dolomitic in large beds, and hasour almost no fossils until near the top where shells and then limestone come in. Here Atropia (crasely plicate) are common. See the small lot of fossils. the Apache ear Lauwen wants to put all into the Cambrian; the Trog quartzite into the Upper Cambrian, and the rest into the Middle and Low Cambrian. To see the Trog, Chescah and Chipping Spring are unmistakably marine and of Upper cambrian age. I could put all of the Apache into the upper Cambrian and I have no doubt more fossils will be found to prove this. The quartzite The pettles of the various employments Peyersone and Lauwen says come from Portergric formation and good outcrops of them canbe seen about 10 miles to the north of the Selber- Here they lie unmapped across the lower part of Cambrinian Ray area. Above these or under the Plateau