112 NEW YORK STATE MUSEUM 



This faunule indicates that also the black shale at the south end of 

 Lake Champlain, near Ticonderoga, is referable to the Canajoharie 

 shale. 



A long exposure of black shale is found at the north end of Wills- 

 boro Point, about two-thirds down the lake, and half way between 

 the Panton outcrops and the large outcrops of black shale on Grand 

 Isle, Vermont. The contact or transition with the Trenton lime- 

 stone was not observed. Unfortunately a strongly developed cleav- 

 age cuts this shale perpendicular to the bedding planes and this makes 

 collecting extremely difficult. There were found, however: 



Mesograptus mohawkensis Ruedemann 

 Leptobolus insignis Hall 

 Dalmanella rogata Sardeson 

 Liospira sp. 

 Triarthrus becki Green 

 Primitiella unicornis (Ulrich) cc 

 Aparchites minutissimus (Hall) cc 



This faunule indicates the uppermost division of the Canajoharie 

 shale and demonstrates that the latter extends northward beyond the 

 middle of the Champlain basin. 



There is but one outcrop of shale between Willsboro Point and the 

 Canadian boundary line, that at Stony Point ij4 miles south of 

 Rouses Point, and thus close to the international boundary. Here 

 were found in hard, splintery, dark bluish gray calcareous shale: 



Climacograptus spiniferus Ruedemann c 

 Glossograptus quadrimticronatus Hall c 

 Lasiograptus eucharis {Hall) r 

 Leptobolus insignis Hall r 

 Triarthrus becki Green cc 



This faunule is characterized by the combination of Glosso- 

 graptus quadrimucronatus, and Climaco- 

 graptus spiniferus, with Lasiograptus 

 eucharis and Triarthrus becki. 



Climacograptus spiniferus and Triarthrus 

 becki* point unmistakably to the eastern shale belt and a northern 

 continuation of the Martinsburg, Snake Hill and Canajoharie shales 

 of Pennsylvania and New York into this northern Champlain region. 

 As to the age of the rock we infer from these two fossils that it i? 

 still older than Utica and probably homotaxial to late Trenton, a con- 

 clusion that is not contradicted by the other graptolites because they 



*(Note). Triarthrus becki is a Snake hill and Canajoharie form 

 The Utica and Frankfort form is T . e a t o n i Hall. 



