60 NEW YORK STATE MUSEUM 



locality is very fossiliferous, and the weathering and fires have 

 so decomposed parts of the massive cliff that it makes an excellent 

 place for collecting. ,Along,the road from Altamont there are 

 alternating exposures of sandstones and shales, sandstones pre- 

 dominating, with a thickness of 635 feet by the barometer with- 

 out allowing for the dip, which would increase the amount; then 

 210 feet are covered when this Pentamerus ledge is reached, 845 

 feet higher than Altamont. It is not clear whether the base of 

 the Pentamerus is shown or not, but the Tentaculite is covered, 

 and only 30 feet of the Pentamerus is exposed. The following 

 species were collected at this place. 



1 Sieberella galeatus (Dal.) H. & C. (aa) 



2 Atrypa reticularis (Lin.) Dal. (a) 



3 Strophonella punctulifera (Con.) Hall (c) 



4 Stropheodonta varistriata (Con.) Hall (r) 



5 Spirifer perlamellosus Hall (r) 



6 Uncinulus mutabilis (Hall) H. & C. (r) 



7 U. pyramidatus (Hall) H. d C. (rr) 



SECTION NEAR KNOX 



About 4 miles southwest of Altamont and 1J miles northeast 

 of Knox, at a locality known as " the Rocks," are interesting ex- 

 posures of the Helderberg limestones and, specially, of the Orisk- 

 any sandstone. This is also an excellent place for collecting 

 Oriskany fossils, and the formation forms the bed of the Alta- 

 mont-Knox highway for some distance. The following section 

 begins on the lower road at the Armstrong house, near the foot 

 of the hill, and extends to its top. 



Feet 



XI B 1 Massive ledges of Pentamerus limestone. Prob- 65=65 



ably the lower part of this zone is transitional to 

 the Tentaculite limestone; but the latter is not 

 shown at this place. 

 B 2 Mostly covered slope, with occasional exposures 95=160 

 of shaly limestone. These shales are very 

 fossiliferous, and many species may be obtained 



