Report of the State Geologist Author:James Hall Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: NEWARK ROCKS OF ROCKLAND COUNTY, N. Y. The Newark formation occurs in New York state only in Rock- land county. It occupies a triangular area the base of whic... more »h is formed by the New Jersey state line between Suffern and the Hudson river, and the apex of which is at Stonypoint. The Hudson river marks one side of the triangle, and the steep escarpment of Ramapo mountain, stretching northeastward from Suffern to Stonypoint, forms the other. The area of the triangle is about 100 square miles. This small area is the northern end of a belt which extends southwest through New Jersey, Pennsylvania, Maryland and into Virginia. It must therefore be studied with due regard for this relationship and in the light of conclusions drawn from the careful examination of the more southern parts of the belt.1 Some of the conclusions set forth in this paper have been based on evidence collected in New Jersey, and would not be warranted were the facts of this smaller area only to be considered. TOPOGRAPHY The region is characterized by a rolling topography—a series of hills trending north and south, separated by valleys which have been eroded from 150 to 200 feet below the level of the hilltops. There is usually but slight difference in the steepness of the eastern and western slopes of these ridges, although where such a difference exists, the eastern slope is nearly always the steeper. Most of the roads which extend north and south follow either the valleys or keep along the crests of the hills and are fairly level. The east and west roads cross the narrow, steep-sided ridges at right angles and are very hilly. The general level of the tops of the hills in the western part of the area iDetalled reports on the New Jersey area will be found in the annual reports of the state geologist of ...« less