48 NEW YORK STATE MUSEUM 



In addition, a few feet above the most fossiliferous bed of this 

 zone is a thin bed (zone 2a, 5a of Ulrich) filled with S y n t r o - 

 phia lateralis Whitfield. 



Above zone 2 fossils are comparatively scarce, though apparently 

 of these same species through a thickness of some 30 feet of beds, 

 when the two Cryptozoon horizons are reached (beds 18 and 21 of 

 the Pythian Home section). From bed 18 we collected no fossils 

 aside from the Cryptozoon. But bed 21 contains the best preserved 

 fossils obtained from the entire section, lying above the Cryptozoon 

 masses, and evidently inhabiting the reef. Good material can be 

 collected only from somewhat weathered rock. In freshly quarried 

 material the fossils break across. 



Zone 3 (zone 6 of Ulrich) Eccyliopterus zone. 



Cryptozoon sp. undet. (cf. C. minnesotensis Winchell) 



Eccyliopterus planidorsatus Ulrich 



Eccyliopterus planibasalis Ulrich 



Endoceras montrealense Billings 



Cameroceras (?) (siphuncle only, strongly annulated) 



Involute cephalopod of undetermined genus 



Of this fauna E. planidorsatus is the common form, 

 outnumbering E. planibasalis by 5 or 6 to i. Annulated 

 cephalopod fragments are not scarce, but the Eccyliopterids are 

 the abundant fossils. 



Zone 4 (7 of Ulrich), Hormotoma zone, only a few feet above 

 zone 3. 



Hormotoma gracilens Whitfield, 



Turritospira cf. anna Billings and confusa Whitfield. 



This thin layer is crammed full of these small gastropods, and 

 likely several other species can be identified when the fauna is 

 thoroughly studied. 



Ulrich comments on the fossils as follows : "Apparently all 

 these zones belong above division C and beneath division E of the 

 Champlain section. Stratigraphically then, they occupy the position 

 of division D. The fauna of division E is not even suggested', 

 while none of the species are of those which particularly charac- 

 terize the fossil beds at Fort Cassin. The latter, I believe, belong 

 between typical D and E. Hence the Ogdensburg dolomite seems 

 to correspond exactly, or at least essentially, to division D." ^ 



1 Letter of January 13, 1915. 



