GRAPTOLITES OF NEW YORK. PART 1 491 



correlation table of zones in New York, p.575]. To the Trenton were referred 

 tlie typical Normanskill or lower Dicellograptus fauna, the lower Dicellograptus 

 fauna of Mt Olympus at Troy, which contains some differing elements 

 and the Diplograptus amplexicaulis fauna. The Utica formation 

 was found to be represented by four different faunal associations: that of 

 Mechanicville, which contains, besides the typical Utica fossils, Conularia 

 trentonensis and Climacograptus caudatus, a form hitherto 

 known only from Europe as being associated with the equivalent of the 

 Normanskill fauna ; the Utica fauna of Van Schaick island, which has Crypto- 

 graptus tricornis, another Normanskill form, as an element ; the typical 

 Utica fauna of Rural cemetery, etc. ; and the Upper Utica fauna of the old 

 Dudley observatory site, etc. The first two faunas are evidently transitional 

 to the Trenton. A fuller account of the faunas of these zones and a 

 discussion of their relations to European faunas will be given after a renewed 

 and more detailed study, in a subsequent memoir. 



In another publication [1902] the writer has announced the discovery of 

 the Quebec (Levis) graptolite fauna at the Deep kill in the " Hudson river 

 shales " of New York, and of its division into three well defined zones, which 

 in their faunal constitution exactly correspond to the homotaxially successive 

 European zones. These zones were correlated by the writer with the Beek- 

 mantown or Calciferous beds of New York, the uppermost being considered 

 as possibly of Chazy age. It is this locality at the Deep kill Avhich, yielding 

 an extremely rich fauna m an exceptionally excellent state of preservation, 

 has furnished the larger portion of the material for this memoir. 



As we have in the paper mentioned given a full account of the Canadian 

 and European equivalents of the Deep kill zones and of the geographic 

 distribution of the faunas represented there, we refer here for all details to 

 that publication and to the correlation table [p.575] of the zones and the table 

 of the distribution of the species, appended to this chapter, restricting 

 ourselves in this place to a short characterization of the zones. 



The presence in New York State of the Dictyonema flabelli- 

 forme zone, so well known in Europe as characterizing the upper limit 



