20 NEW YORK STATE MUSEUM 



i Compact bluish dolomite, with Enterolasma caliculus 



(Lockport) 4 feet 



2 Dark grayish brown dolomite with white chert nodules. This 

 layer has furnished Trematonotus alpheus, but fossils 

 are very scarce. (Guelph or upper Shelby horizon) 



Wayne county 



The original occurrence of Guelph fossils in New York, was, as we 

 have already noted, from the bottom of the Erie canal near Newark. Pro- 

 fessor Hall has stated that these remains (a mere handful of depauperated 

 shells) were thrown out with the Salina marls, the rock containing the fossils 

 preserving " the celluliferous structure and characteristic color of the argila- 

 ceous limestone of that formation." ' Newark lies on the Salina shales which 

 are shown to a depth of not less than 200 feet in well sections in the city.* 

 The canal (9 feet deep) passes through the city in an east-west course which 

 it retains for several miles. The nearest outcrop of the dolomite is at Fair- 

 ville, 6 miles due north. This outcrop may be near the middle of the series 

 and the dip of the beds is south 30-50 feet to the mile. It would thus 

 appear that Professor Hall's specimens must have come from a high hori- 

 zon, even within the Salina shales wherein was represented a brief, ill con- 

 ditioned return of Guelph species. 



Southern Ontario — the section at Hamilton 



The composition of the Niagara escarpment, which is finely continued 

 along Lake Ontario (Hamilton bay) just south of the city of Hamilton, has 

 been carefully studied by Colonel C. C. Grant of that place, who has pub- 

 lished various data in regard to it. Dr J. W. Spencer also some years ago 

 studied this region stratigraphically and described some of the fossils there- 

 from. From these sources we gather that the section here is the following, 

 beginning at the top. 



■N. Y. State Cab. Nat. Hist. 20th An. Rep't, p. 305 (rev. ed. p. 347). 



2 The section of a well put down at Alloway, 3 miles south of Newark, showed 580 feet 

 of Salina shales to the top of the dolomites. [See Prosser. Am. Geologist, June 1900, 

 P- 353] 



