Bulletin of the United States Geological Survey Volume 65-70 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...of King's Point, there is a fine cross section exposure, showing the relations of the trap to the underlying strata, as shown in Fig. 22. Northward from the tunnel for some distance outcrops are infrequent, but the line of contact appears to remain essentially unchanged in position nntil near Guttenberg, where there are some indications of either a slight fault or a change of horizon. The relations at this point are not determinable on account of the drift and debris, and a slight local decrease in dip may be the cause of the apparent irregularity. In the road below the quarries of Guttenberg there is a dike in the arkose underlying the trap, exposed as shown in the following figure: Flo. 23.--Dike in arkose below the qnan ies at Guttenberg, New Jersey. Looking northwest. From a photograph This dike appears to be connected with the palisade trap, and is a precisely similar rock, but whether it is an ascending dike or an offshoot from the trap above is not known. At Fort Lee landing there is a break in the continuity of the crestline, a shallow depression extends up into the ridge, and the line of escarpment offsets several rods to the eastward to form the "Blufif" which marks the beginning of the palisadal front, thence extending uorthward uninterruptedly beyond tbe State line. Near the lower end of the depression behind the " Bluff" there is an obscure exposure in the road-side, in which the trap breaks down across the edges of the intensely indurated shales and the base of the sheet in the "Bluff" is apparently about 75 feet below the horizon, which it held southward. It seems probable that in this instance there is a descent of the trap laterally across the edges of the shales for some distance, as in the King's Point exposu...