Ptero. 



816 



Pteronites chemungensis. (Avicula chcmun^ensis.Yan- 



uxem, Geol. N. Y. page 

 182, fig. 49. Rogers 

 Geo]. Pa., page 829. 

 fig. 678. Hall Geol. N. 

 Y., 1843, page 263, fig. 

 118, l,a, b. (Compare 

 Avicula damno7iensis 

 Sowerby. in Geolog. 

 Trans. London 1 2] 

 LIII, fig. 22.) 

 Chemung for- 

 mation, — In 

 Huntingdon 

 and Centre 



49.' 



counties it is characteristic of the 

 Chemung (T, 29; T4, 434), as, for in- 

 stance, in sandy shales No. 44, 45, Fa. 

 R. R., Juniata section below Hunt- 

 ingdon. (T3, 264.) In Columbia Co. the Rupert's Narrow's 

 beds 41 (G7, 69, 70; Claypole's Cat. spec. 93-11, fine speci- 

 mens). The Bloomsburg section bed 67 (G7, 287), and beds 7, 

 9 (G7, 290) yield it with Chonetes setigerus. and Spirit era 

 mesoGOStalis^ in the Chemung proper. But in the Catawissa 

 section (G7, p. 238) it occurs with Lingula spatulata^ in bed 25, 

 800 feet above the Catskill HoloptychiusAsh-hed^ or 1300 above 

 top of Chemung proper. VIII g ; XI. 



Pteronites decussatus. [Avicula decussata.) Hall. Geol. 



VII! c^ 



of Fourth District 

 N.Y. 1843, page 203, 

 fig. 82, 1 (a cast in 

 limestone), fig. 82,2 

 (a shell in shale.) 



