288 



NEW YORK STATE MUSEUM 



kethau creek is the highest ridge of the Helder- 

 bergs which is composed of slightly arenaceous 

 shales containing abundant Hamilton fossils. 

 Onondaga limestone 



Cliff of massive limestone, the top of which forms 

 the upper terrace due to the erosion of the Mar- 

 cellus shale. The rock is light gray in color, 

 contains in places a considerable amount of 

 chert and is not very fossiliferous, most of the 

 species being corals. 

 Schoharie grit 



An impure, dark gray limestone which weathers 

 to a buff, porous sandrock, shown in places at 

 the base of the Onondaga limestone on the cliff 

 south of west of the house of Mr K. P. Parrish, 

 where a thickness of 2' 10" was measured. 

 Esopus shales 



Blackish, somewhat arenaceous shales which con- 

 tain specimens of Spirophyton ca u da- 

 gal 1 i (Van.) Hall. 

 Oriskany sandstone 



Very dark gray quartzite sandstone which 

 weathers to a brownish color and contains 

 abundant fossils. The upper surface of this 

 sandstone is generally covered with mark- 

 ings of Spirophyton caudagalli, 

 and it forms the upper part of the lower ter- 

 race. The fossils are: 



1 Spirlfer arenosns (Con.) Hall a 



2 S. murchisoni Cast, a 



3 S. pyxidatus Hall r 



4 Rensselaeria ovoides (Eaton) Hall c 



5 Eatonia peeuliaris (Con.) Hall c 

 Meristella lata Hall r 



7 Leptocoelia flabellites (Con.) Hall r 



8 Ortbis (Rhipidomella) musculosa Hall c 

 1) ELipparionyx proximus (Van.) H. & C. (?) r 



Small specimens, probably young individuals. 



10 Platyostoma ventricosum Con. r 



11 Orbiculoidea ampla (Hall)— Discina grandis (Hall) H. & C. r 



12 Ortbis sp. V 



13 Stropheodonta cf. m'agniventra Hall r 



14 Platyeeras nodosum Con. r 



Becraft limestone 1 17-596 



Ledge of massive, light gray, fossiliferous lime- 

 stone which is well exposed some distance 



1 Corrected measurements for this and the New Scotland beds were given 

 by Prosser in Am. Oeol. 1003. 32:380. 



Feet Total 



100-822 



3-722 



121-719 



2-598 



