30 NEW YORK STATE MUSEUM 



and lists from this locality [1896, p. 296] which, as he states, furnishes the 



largest fauna of the subzone : 



Dicranograptus nicholsoniiw. arkansasen- D. peosta mut. perexcavatus nov. ? 



sis Gurley D. truncatus ? Lapworth 



D. ramosus Hall Cryptograptus tricornis (Carruthers) 



Climacograptus caudatus Lapworth Lasiograptus mucronatus (Hall) 



id. var. laticaulis Gurley Dendrograptus unilateralis Gurley 



C. kamptotheca Gurley D. sp. 



C. oligotheca Gurley Dictyonema sp. incert. 



C. scharenbergi Lapworth Thamnograptus barrandi Hall 



C. wilsoni Lapworth Corynoides calicularis Nicholson 

 Diplograptus foliaceus Murchison 



It will be noticed that these faunules observed in Canada are essen- 

 tially relict faunules of the climacteric fauna of the zone of Nemagraptus 

 gracilis. The Didymograptidae have vanished entirely and the Dicrano- 

 graptidae almost ; only the long range forms Dicranograptus ramo- 

 sus and n i c h o 1 s o n i are still observed, and the Diplograptidae can be 

 said to hold now almost entirely the field with the genera Diplograptus, 

 Climacograptus and Cryptograptus. The graptolite shales of New York 

 or of any other part of the United States have not yet furnished a typical 

 representation of this zone, 1 but we have in this State several faunules which 

 clearly are intercalated between the Normanskill and Utica shales and obvi- 

 ously either represent fragmentary faunules of this zone or minor subzones 

 of the same. 



As the most important of these Ave regard the shales with Diplograptus 

 amplexicatdis var. pertenuis exposed in various localities ^Watervliet 

 arsenal etc., see N. Y. State Mus. Bui. 42, p. 5 28) denoting a belt of rock 

 that passes along the Hudson between the cities of Troy and Albany and 

 is intercalated between Normanskill shales on the east and Utica shale on 

 the west. Lapworth has also commented \op. cit. p. 172] on " the presence 

 of a form identical with, or closely allied to, the G . amp 1 ex i cau 1 i s of 



1 (lurk-)- thought at first to recognize it in the graptolite shales of Arkansas [ 1892, p.403], 

 but later [1S96, p. 305] changed Ins view regarding the proper correlation of that fauna. 



