The following refers to the Havengurk. See the later addendum. At about 1 1/2 mile south of Delaware Hotel the red clay stops, the shales dip out rather quickly disagreeable and the white series goes over into them bedded sand- stones and conglomerates with the pebbles again little thine of the Havengurk and from 3/4 to 3/8 inch in diameter. All of the clay, grimes (more than 1/2 thickness) have flaccid shale pebble inclusions, some rounded but most of them are flat. It is a rough material, coarse, poorly cemented, and much concreted. This series may be the Upper Medina sandstones, 1 200 feet in thickness. Below it the section cannot see therefore then must be shale, below. The thickness known is not quite enough to be the Medina upper shales for after 300 to 400 of shales appear again coarse, conglomeratic clay with clay bedded sandstone and flaccid shale in- clusions. The Hudson River at the N.-E. end of Gap consists dark and light of blue-black shales with grimes of them bedded dark quartz- ites, probably more than half in sandstone. The junction plane has about the same dip on both sides and other than well character it is hard to distinguish them.