38 NEW YORK STATE MUSEUM 



(Lingulepis) acuminata, Agraulos sp. nov.^ and 

 Ptychoparia matheri Walcott. 



HOYT LIMESTONE MEMBER 



In 1879 ^^ C- ^- Walcott first described an Upper Cambric 

 fauna from limestones of that age in the vicinity of Saratoga, and 

 made frequent reference to the same fauna and beds in subsequent 

 publications.^ In 1899 Clarke and Schuchert first assigned a name 

 to this formation, calling it the Greenfield limestone." This name, 

 however, was preoccupied having been previously assigned to a 

 limestone of Siluric (Monroe) age, in central Ohio. A new name 

 had therefore to be assigned, and yet no suitable one seemed forth- 

 coming. The known exposures of the formation are all in Green- 

 field township, and the villages in the township all bear the name 

 of Greenfield, in so far as they are located on the formation. There 

 are no good exposures of the formation along any watercourse 

 whose name could be utilized. The name Saratogan was preoc- 

 cupied. Under the circumstances there seemed no alternative but 

 to apply to the formation the name of the quarry at which it is 

 best and most fully shown (plate 2). The name of the quarry has 

 already appeared in geologic literature, in papers by Hall, Walcott 

 and Prosser.^ Unfortunately the farm has changed hands and the 

 quarry is no longer locally known as the Hoyt quarry. But no 

 other name suggests itself as suitable, and we are therefore pro- 

 posing the name Hoyt limestone for the formation, at the same time 

 indicating the location of the quarry upon the geologic map. 



In an earlier paper by Ulrich and Gushing this Hoyt limestone 

 was made a basal member of the Little Falls dolomite, the next 

 formation above. ^ More strictly, however, it seems a phase of the 

 upper portion of the Theresa formation, the thickness of the 

 Theresa and Hoyt together, in the vicinity of Saratoga, about equal- 

 ing the thickness of the Theresa alone north and west of Saratoga; 



1 Regarding this Dr C. D. Walcott writes Doctor Ruedemann this form is 

 " very closely related, if not identical with a species of Agraulos which I 

 have marked as a new species from the upper beds of the St Croix sand- 

 stone of Wisconsin." 



2 N. Y. State Mus. Nat. Hist. 326. Ann. Rep't, p. 129-31 ; U. S. Geol. Surv. 

 Bui. 81, p. 346-47. 



3 Science, December 15, 1899. 



* N. Y. State Mus. Nat. Hist. 36th Ann. Rep't, pi. 6, description ; Science, 

 1884, 3:137; N. Y. State Mus. Bui. 34, p. 478-79. 

 ^ N. Y. State Mus. Bui. 140, p. 129. 



