REPORT OF THE STATE PALEONTOLOGIST 1901 429 



these lenses which were made by the paleontologist in 1899 and 

 1900 have been supplemented during the last year by a fuller 

 and more careful study of the field conditions by Prof. A. W. 

 Grabau of Columbia university. Dr Grabau has had as asso- 

 ciates in this work H. W. Shimer of Columbia university, R. F. 

 Morgan of Bulfalo, T. W. Peirson of Lockport and Charles- 

 Ewing of Middleport, all of whom in this work volunteered 

 their services. 



Evidence of these lenses has been found at Lockport; on the 

 east side of the " gulf " and north of the Niagara road is an 

 exposure of several of them lying on the shelf formed by the 

 Clinton limestones. One of these could be located only by pre- 

 sumption, as its site seems to be cohered by the embankment 

 of the new^ electric railroad. Two other lenses are exposed 

 within a short distance of each other, and these apparently rest 

 on the surface of the Clinton limestone. The greatest thick- 

 ness of these two bodies w^as 3 to 4 feet, though this may 

 have been reduced by long weathering. Compared with the 

 lens outcrops farther west in the vicinity of Lewiston, these 

 at Lockport did not prove very fossiliferous, the principal fos- 

 sils being Lichenalia: and Whitfieldella nitida. The 

 lithologic structure of the rock however, a subcrystalline^ 

 unstratified mass of hardened, calcareo-magnesian mud, is very 

 characteristic and in harmony with the traits displayed at 

 other localities. Heretofore actual exposures of these lenses 

 have not been recorded at Lockport, Dr Ringueberg's original 

 description having cited only loose blocks of this material in 

 this neighborhood. In the northern part of the city of Lock- 

 port, in the rear of William Stamp's lot on Jackson street, and 

 on land owned by Mr Mansfield, several large masses of the 

 same rock are exposed. These rest on the limestone ledges of 

 the Clinton, which here form a shelf of some width. This 

 exposure would seem to indicate not less than two separate 

 rock bodies. 



Between Lockport and Oasport none of these lenses have been 

 seen, exposures everywhere being unfavorable for their exhibi- 



