. Annual report of the Regents. New York State Museum; Science. NEWARK ROCKS OF ROCKLAND COUNTY, N. Y. 29 south of the Rockland lake landing (&, fig. 4). 100 yards north of the landing (c) a welded contact of fine grained trap resting on highly metamorphosed shale is exposed near the water level in the bed of a small brook. Just north of this, brown sandstone outcrops at a higher level, showing that here again the trap ascends at least 25 and probably 75 feet across the beds. Be- tween these exposures north and south of the landing, the base of the trap seems to be near the water level. Th
. Annual report of the Regents. New York State Museum; Science. NEWARK ROCKS OF ROCKLAND COUNTY, N. Y. 29 south of the Rockland lake landing (&, fig. 4). 100 yards north of the landing (c) a welded contact of fine grained trap resting on highly metamorphosed shale is exposed near the water level in the bed of a small brook. Just north of this, brown sandstone outcrops at a higher level, showing that here again the trap ascends at least 25 and probably 75 feet across the beds. Be- tween these exposures north and south of the landing, the base of the trap seems to be near the water level. The evidence appears to show that there is no change of horizon at the gap just back of the landing. This point is of importance in determining whether or not the gap is located on a fault line. Though not conclusive, the evidence is strongly against the fault hypothesis. JO Feet .\ 1- ,1 \\l 'V-i-ii-Miio / / -:ij in. Fig. 3 Basal contact near the powder house one mile south of Rockland Lake landing. From Rockland lake landing northward the trend of the shore constantly brings higher beds down to the level of the river. The base of the trap must, therefore, soon be carried below sea level, unless it changes to higher geologic horizons. At the locality last mentioned the contact rises by crossing the beds to an ele- vation of at least 75 feet above the river. (Thence it is in part conformable to the shales and in consequence slowly descends to about 25 feet above the river at the Cosgriff trap rock quarry (d, fig. 4) at Trough Hollow. Whether in this interval of half a mile it changes its horizon is unknown, as the actual contact is not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
