1190 



NEW YORK STATE MUSEUM 



can a continuous section from top to bottom be examined, and 

 the physical characters of the formation are such that it has 

 suffered great deformation, which is manifested in the pro- 

 nounced slaty cleavage, numerous small folds and local thrusts, 

 all of which render determination of its thickness a matter of 

 much difficulty. Portions of the New Scotland beds are exposed 

 at several points. Among the best exposures are those at the 

 south end of the vertical cut on the west side of the Vlightberg; 

 along the top of the Vlightberg; on the north side of Delaware 

 avenue; between the Delaware avenue quarry and Gross's lime 

 quarry; in the foot wall of the White lime quarry; and in a 

 low bluff at the west side of the small swale that extends 

 northwestward from the Old quarry. This formation consists 

 of dark gray shaly limestone bands alternating with frequent 

 thin seams of gray semicrystalline limestone.- At some points, 

 as on Delaware avenue, sandy shales are present in the middle 

 of the formation. The lower portion has considerable chert, 

 which is often associated, as in the underlying Coeymans, with 

 an abundance of sponges. The upper portion of the New Scot 

 land graduates by increased thickness of the limestone bands, 

 which contain abundant " scutellae," into the lower portion of 

 the Becraft limestone. This transition is very gradual and 

 may be well seen in the White lime quarry, in the Old quarry, 

 in the Vertical cut, and in the quarry which follows the out- 

 crop of the Becraft limestone along the face of the hill at the 

 northern end of the West Shore Kailroad bridge at Wilbur. 



Several feet of the upper portion of the New Scotland beds 

 are so limy, that they might with equal propriety be included 

 with 1he overlying Becraft limestone, but the line between the 

 two formations has been drawn at a well marked division plane,' 

 which indicates a stoppage or temporary change in the sedi- 

 mentation. 



FAUNA OF THE LOWER NEW SCOTLAND BEDS 

 From the ledge northwest of the Old quarry 

 Orthothetes woolworthanus Hall, aa Chactetes sphaericus Hall, c 

 Strophonella piinr-tulifera (Conrad), c Stropheodonta becki Hall, aa 

 Rhipidomella oblata Hall, c j Leptaena rhonihoidalis (Wilck), aa 



Crinoid stems, aa Phacops logani Hall, c 



I-ochilina, minute species, aa Dalmanitos plouroptyx (Green), c 



