"We then rode a long distance over deeply dissected holson deposits. There are three plains here, and the streams are slowly cutting to a still worn level. Back in the Pleistocene or better in the Pliocene the climate must have been dry dry, and much drier than now, or that mountain debris was all preserved in the hollows filling in all between the arks. In the center of the plain occur thick beds of gypsum and diatom deposits sometimes 10 ft more foot thick. Finally we passed Christmas and Omminett and came out into the valley of the Salina river. It had considerable water. At three miles from Drinkleman's, where the San Pedro river joins the Salina, are are in the Pennsylvanian series. Lawson said are more high in the Pennsylvanian. There are rare fossils common. Composita.