majence sets in bringing in an abundance of marine life (the first time). This is the Potowom or Tama River sands and this eutrajene con- tinues into the Eocene when the sea outside. Today I saw nothing of the unemformities described by Clarke between the Patuxent and the Potascer and between the latter and the Raritan. As the Potomac deposits are largely of continental origin it seems to one that these unemformities may mean nothing. Then again they may and but only after it has been shown that considerable variations exist in the planes, that either mud erosion has taken place or that the surface shows considerable decomposition at the formation of soils. The metamorphosed schismic = metarhyolite seen so much along the D & B. R. R. is deeply rotted and chemically altered. In some of the cuts this decomposed material or mud simulates the Potascer that I took it for it only the chance by Banell that it was the altered metarhyolite. The Drayland Quarry has cropped it also as the Potascer in two cuts north east of Jackson station.