HORIZONS AND FOSSILS 351 



Irondeqnoit limestone. Whether the lower shaly part of this limestone 

 at Rochester contains any representative of the Brewerton is not yet de- 

 termined; it is not very productive, except for ButJiotrepliis crassa, and 

 has not been carefully collected from, but Busophijcus Inloha and Eopliy- 

 lon? striatum occur in a brilliant green shale film at the basal contact 

 zone. 



Since "Phoenix" has been used by Keith for a limestone lentil in Utah 

 and by Daly for a volcanic formation in British Columbia, recourse may 

 be had, if necessary, to Schroeppel, the township in which Phoenix lies. 



HERKUIER SANDSTONE 



This name is derived from Herkimer County and is here applied to the 

 Upper Clinton "gray 1)and" of Eaton, Avliich stretches conspicuously 

 across the southern part of this county with a maximum tliickness of 70 

 or 80 feet at the type locality on Steeles Creek (1 : 81-82, 257; name pre- 

 occupied), five miles southwest of Herkimer village, where it has yielded 

 (3:100-105): 



2Ii/ti1arca mytilifonnis Orthoceras clavatum 



Modiolopsls ovata Trimcrus delphinocephaliis 



Modiolopsis suhcar'mata "Ichthyodontlitc'' 

 Ctcnodonta elJiptica 



As a part of this congeries, but from localities farther west that seem 

 to belong to the Phoenix division. Hall has described also: 



Rafinesquina ohscuraf (probably Schtichertella suljplana!) 

 Pentamerus oralis Diaplioro stoma sp. 



These have been listed under the Phoenix, of which we believe the Her- 

 kimer is indeed only a sandstone phase, as before argued, and as Hall 

 apparently suspected. 



DONNELLY IRON ORE 



Tlie ore "at Thomas DonnellyV (1:88) has been correlated (9:26) 

 with the thin seam at the base of the upper Irondequoit (Lakeport) lime- 

 stone in the Lakeport well and with that at Tipple's quarry, near Verona 

 (1 : 87), all of which are al)0ve the Phoenix and close to Lockport quarries. 

 Vanuxem (1:89, 272) describes other doubtful exposures along Oneida 

 Lake and a 2-foot bed of ore at Joscelin Corners, only a mile or so from 

 the drilling. He lists from Donnelly's the following, two of^ which occur 

 also at Tipple's : 



Lcptwna rliomlioidaUs A trypa reticularis a/finis 



^pirlfcr (Eospirifrr) radiatii.^ Pcntmnerus ''oMongus" {oralis f) 



