Portage Stages of New York. 225 



Paraeyclas lirata (Con.) Hall, common in the Hamilton of 

 central and eastern New York,' and then extends well np into 

 the Portage ; Cimitaria recurva (Con.) Hall, Hamilton of 

 central New York and reported from Mt. Upton* which is 

 near the same horizon as the Norwich and Oneonta zone ; 

 Goniophora carinata (Con.) Hall, from Oneonta and Mt. 

 Upton and consequently in this zone ; Leptodesma Rogersi 

 Hall, in the upper Hamilton and at Norwich ;f and Phacops 

 rdna (Green) Hall, is reported doubtfully from the Upper 

 Helderberg and occurs in the Marcellus, Hamilton, Tully lime- 

 stone, and Chemung. Consequently it is clear that so far as 

 the fossils are concerned this list sIiowl a closer relationship 

 with the " Ithaca group," as stated by Varuxem in 18424 than 

 with any other stage. To be sure most )i the species occur 

 in the Hamilton stage, but so do the majority of the species 

 found in the "Ithaca group" at Ithaca, and judged by that 

 alone the zone might be referred to the Hamilton instead of 

 the Portage where its stratigraphical position and other evi- 

 dence show it to belong. 



At Norwich, six miles south of North Norwich, the base of 

 this zone has been carried by the dip below the surface. A 

 number of observations along the Chenango valley indicate 

 the dip to be between 35 and 40 feet per mile for that region. 

 The high hill west of Norwich affords a good section of 550 

 feet. At the base of the hill on the Canaswacta creek are the 

 lowest rocks, at an approximate elevation of 985', which are 

 bluish rather arenaceous shales containing fossils. At 1140' is 

 the base of an old quarry which runs up to 1193' and in this 

 quite a good many fossils were found. The most common 

 species are Paraeyclas lirata Con., Chonetes scitula Hall, 

 Tropicloleptus carinatus Con., Phynchonella Stephani Hall(?) 

 and Atrypa reticularis (Linne) Dal. At 1230' are the last 

 shales containing fossils below the reds and grays. The most 

 abundant fossils are segments of crinoid stems, but with these 

 are specimens of Paraeyclas lirata Con. and Cypricardella 

 (Microdon) bellistriata (Con.) Hall. At 1262' are rather fine 

 fissile shales which are succeeded by coarse sandstones at 1370'. 

 A prominent concretionary sandstone occurs at 1410' and at 

 1460' is a coarse gray sandstone. The first red shale resting 

 on thin fissile olive shales, occurs at 1475' and in the red shales 

 at about 1479' is a somewhat calcareous layer with pebbles con- 

 taining numerous fish scales which are found to a less extent 

 in the red shales close to this stratum. The red shale stops 



* Pal. N. Y., vol. v, Pt. I, Lamell. II, p. 468. 

 \IbicL, Lamell. I, p. 177. 



X See Geol. N. Y.,~Pt. Ill, p. 178, where this quarry is described under the 

 head of the Ithaca group. 



Am. Jour. Sci.— Third Series, Vol. XLYI, No. 273.— Sept., 1893. 

 16 



