Annual report . e limestone aboutfour miles to the northeast at Swartoutville, a hamlet two and one-half miles north of Brinckerhoff. On the Haight farm the fossil-iferous limestone is well exposed in the fields, but in the brush it isfollowed with great difficulty. This rock, or that with which it isinterbedded, is overlain by a calcareous conglomerate in certainplaces. The fossiliferous limestone is very dense and compact. It isquite impossible to remove the coils from the smooth surface. Ahard blow with the sledge simply chips the rock into small pieceswith conchoidal fracture. The chisel m
Annual report . e limestone aboutfour miles to the northeast at Swartoutville, a hamlet two and one-half miles north of Brinckerhoff. On the Haight farm the fossil-iferous limestone is well exposed in the fields, but in the brush it isfollowed with great difficulty. This rock, or that with which it isinterbedded, is overlain by a calcareous conglomerate in certainplaces. The fossiliferous limestone is very dense and compact. It isquite impossible to remove the coils from the smooth surface. Ahard blow with the sledge simply chips the rock into small pieceswith conchoidal fracture. The chisel makes no impression. The coils are most distinct when at right angles, or nearly so, tothe axis of the whorls. They then show as fine spiral lines,resembling a fine loosely-coiled watch spring, which have weatheredout very sharply into bas-reliefs. When in the plane of the axis, orat a small angle with it, the lines are thick and patchy. The finecoils vary in diameter from one and one-half inches to three-fourths. Pig. 22 Whorls of a discoidal gastropod identified as Ophiletacompacta Salter, from the ledge shown in plate 12 of an inch. The medium-sized are most abundant. They bear theclosest resemblance to the discoidal gastropod O p h i 1 e t acompacta Salter, as described for the Calciferous of theQuebec group1 (see plate 12). 1 Canadian Organic Remains, 1859. Decade 1, p. 16, plate 3. 74 NEW YORK STATE MUSEUM The smaller coils resemble the M a c 1 u r e a sordid a. andOphileta levata of the Calciferous of New Oneform, which very closely resembles the Ophileta com-planata as figured by Hall,2 was noted. The fossiliferous rock at Haights farm lies just east of the Glen-ham gneiss belt with outcrops of the latter not more than 150 or200 feet away. The strike of the limestone varies from n. 15 and the dip from 35° to 400 e. The strike is such as tocarry the limestone diagonally across the gneiss belt. The distanceseparating the gneiss is too short to allow a ve
Size: 2153px × 1160px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
