CRAPTOLITES OF NEW YORK, PART 2 2 <n 



resenting t r i f i d u s , of C . cf. ami q u u s and of the variety r ig i d u s 

 of D i eel 1 . d i var i cat u s suggests the homotaxy and provincial unity 

 of the Arkansas and Indian Territory beds. 



Small faunules which contain elements of the Normanskill fauna have 

 also been collected in Nevada by the geologists of the national government. 

 One from the Silver Peak quadrangle contains: 



Nemagraptus sp. Diplograptus angustifolius Hall 



Dicellograptus divaricatus Hall D. cf. euglyphus Lapworth 



Dicranograptus furcatus Hall Climacograptus sp. 



The specimens are much distorted. 



Another from Belmont, Nevada | Wheeler Survey Rep't, 1875, v - 4. an< ^ 

 Gurley, 1896, p. 306] consists of Diplograptus foliaceus and 

 Dicranograptus nicholsoni var. w h i t i a n u s . The pres- 

 ence of the Normanskill zone or a closely preceding staee has lontr been 

 known in the Rocky mountains oj [Canada and in British Columbia. Lap- 

 worth has recorded [1886] from Kicking Horse (Wapta) Pass, Rocky 

 mountains : 

 Didymograptus nov. aff. D. euodus Lap- Cryptograptus tricornis Carruthers 



worth Diplograptus angustifolius Hall 



Glossograptus ciliatus Emmons D. rugosus Emmons 



G. spinulosus Hall Climacograptus caelatus Lapworth 



and from the shales along Dcase river, British Columbia \ 1889] : 

 Diplograptus euglyphus Lapworth Glossograptus ciliatus Emmons 



Climacograptus cf. antiquus Lapworth Didymograptus cf. Sagittarius (Hall) 



Cryptograptus cf. tricornis (Carruthers) New form allied to Nemagraptus' 



1 Lapworth suggests that both the Kicking Horse pass and Dease river faunas may be 

 a little older than the Normanskill fauna, mainly on account of the absence of the Dicran- 

 ograptidae, Leptograptidae and Nemagraptidae. Since in America also the so called 

 Upper Dicellograptus zone and the succeeding Utica shale are markedly free of these 

 groups, the possibility has to be taken into account that they may be slightly younger than 

 the typical Normanskill aggregation. At any rate it would seem to be giving an exagger- 

 ated importance to this difference in faunal composition if they are correlated with the 

 Chazy [Gurley, 1896, p. 304], for it must be noted that practically all elements of these 

 faunules are present in our Normanskill fauna and they therefore can not be far removed 

 from earlv Trenton acre. 



