128 NEW YORK STATE MUSEUM 



Surface smooth, shining, bearing only fine concentric lines. 

 Internal east smooth. 



Dimensions. Hight 22 mm; width across body whorl 17 mm; 

 hight of body whorl 18 mm. 



Locality. Agoniatite limestone, Manlius. 



This very pretty species has been found by Prin. J. D. 

 Wilson of Syracuse, who has considerately presented the type 

 specimen to the state museum. It is unlike any species known 

 from the New York Devonic in its short, concave spire and very 

 large body whorl, features which will also distinguish it from 

 other forms of the genus. 



STRATIGRAPHY OF THE STAFFORD LIMESTONE 



This limestone has highly characteristic lithologic structure. 

 It is when fresh of a dark chocolate brown, compact in texture 

 and inclined to be splintery under the hammer. Its fossils, in 

 which it for the most part abounds, are often replaced by a black 

 crystalline calcite, and, when weathered, blocks of the rock 

 become gray, while the fossils are contrasted therewith by their 

 dark tint. From the meridian of Flint creek westward to Lake 

 Erie such blocks are common in the drift piles and are at once 

 recognizable. 



Along Flint creek is the first appearance of this interesting 

 limestone, but it is seldom that complete sections of the beds 

 are exposed anywhere in western New York. One was afforded 

 by the Livonia salt shaft, and another, fully described at the con- 

 clusion of this paper, occurs at Lancaster, Erie co. 



In the Livonia salt shaft, as recorded by D. D. Luther and the 

 writer in the 13th report of the state geologist, the Marcellus 

 strata were regarded as beginning at a depth of 650 feet from the 

 surface and continuing downward to a depth of S66.5 feet, giving 

 the beds a thickness of 216.5 feet. This apparently great thick- 

 ness is due to the fact that, in the succession of the upper beds 

 which pass gradually into the Hamilton shales above, a consider- 

 able part of the blue black shales was assigned to this formation 

 on account of the preponderance of Marcellus species. This 



