HORIZONS AND FOSSILS 



347 



WOLCOTT LIMESTONE 



Hartnagel, 1907 (8 : 14:-15), emended. Here, again, in following Hall, 

 two horizons were confounded in the original description, namely, the 

 lower and the middle limestones; hut the t3'pe locality was specified as 

 "Wolcott in Wayne County," and emphasis was laid on the ^'large hrachio- 

 pod Pentamerus oMongus." But in the type region specified this fossil 

 fails in the lower (Reynales) limestone at its sole exposure, on Bear 

 Creek, six miles northeast of Wolcott, which is there so shaly that Hall 

 (2 : 66, 64:) mistook it for the upper shale. The name Wolcott limestone, 

 therefore, must clearly he restricted to the rock which is a limestone and 

 does carry Pentamerus and which alone of the two limestones crops out 

 on Wolcott Ci-eek, namely, at the old Wolcott furnace, just north of A\^ol- 

 cott village (9, figure 3; 2: 66). Its thickness in the Wolcott test well is 

 nearly 22 feet. Wolcott village itself is on fossiliferous Rochester shale, 

 which may have caused the citation (13: 95, 858) of two Rochester shale 

 species as from the Wolcott limestone. 



Though absent at Rochester and westward, where the Reynales has 

 masqueraded for it, the Wolcott limestone (shale to east and north) is an 

 important member in all sections from Wayne County to Clinton and its 

 fauna should be fully investigated. The only species now known with 

 certainty are: Semico scinium clintoni (Vanuxem, 1:87, 89), {''Fenes- 

 tella priscaf Hall), ''Fenestella' tenuis (3:51; compare 2:62, 66 for 

 location), Pentamerus ohlongus (9:21, 31, 32), Calymene clintoni (3: 

 298). Vanuxem (1:89) reports ^^a specimen" of Spirifer niagarensis, 

 but this needs confirmation. 



Vanuxem's specimens of his ''Clinton retepora" (on which he based his 

 correlations now confirmed by the State drillings) are before me from 

 Verona and Martville, bearing the Survey label (Hall's?) : ''Fenestella 

 prisca." This form is highly characteristic of these beds and will prob- 

 ably prove distinct from S. tenuiceps of the Rochester shale. Our Verona 

 specimen contains also a pygidium of Calymene, probably vogdesi. 



In the shales above the oolitic ore at Clinton, which seem to occupy the 

 Wolcott horizon, the following graptolites occur (New York State Mu- 

 seum, Memoir 11) : 



Gactoyraptus crassus 

 Dendrograptus rectus 

 Dictyonema retiforme 

 (collected by the writer) 



Also, close to the ore, 

 Palcuodictyofa clintonensis 

 Palwodictyota hclla recta 

 Cycloffraptus rotadentaius 

 Dictyonema scalariformc 



The finding of the Rochester Dictyonema in these dark blue-green 



