GEOLOGY OF THE HONEOYE-WAYLAND QUADRANGLES II 



Orthothetes pandora Hall 



O. bellulus Clarke 



Orthis cf. lenticularis Hall 



Chonetes deflectus Hall 



C. lineatus {Conrad) 



C. cf. yandellanus Hall i 



Pholidops hamiltoniae Hall 



Stictopora incisurata Hall 



Stereolasma rectum Hall 



The Marcellus beds are covered on this quadrangle except for a 

 smaH 'exposure under the Erie Railroad bridge over Little Conesus 

 creek a mile south of Avon. 



• STAFFORD LIMESTONE 



This formation takes its name from Stafford, Genesee county, 

 where it is well exposed. It is eight feet three inches thick at 

 Lancaster, Erie county, but diminishes gradually toward the east, 

 and at its extreme eastern exposure on Flint creek, Ontario county, 

 is but four inches thick. 



On this quadrangle it is a hard blue limestone, in one stratum 

 14 to 18 inches thick with a few inches of calcareous shale above 

 and below. 



There are no exposures of the Stafford limestone on these quad- 

 rangles but it may be, seen below the second dam on Conesus outlet 

 west of Ashantee, and in the bed of Little Conesus creek east of 

 the Erie Railroad bridge. 



The Stafford limestone is rich in fossils at every exposure and 

 a list published in State Museum Bulletin 49 contains the names of 

 118 species which have been collected from it. This stratum occurs 

 in the Livonia salt shaft at the depth of 823 feet and contained the 

 following forms : 



Phacops rana Green 

 Orthoceras aedipus Hall 

 O. cf. marcellense Hall 

 Loxonema delphicola Hall 

 Pleurotomaria sulcomarginata {Conrad) 

 P. itys Hall 

 P. lucina Hall 

 Meristella barrisi Hall 



