352 E. M . KINDLE 



ITHACA FAUNA AT PINE GROVE, PENNSYLVANIA 



Aulopora sp r 



Cystodictya meeki c 



Chonetes scitula a 



Spirifer pennatus var. posterus a 



Tropidoleptus carinatus c 



Palaeoneilo plana c 



Modiomorpha cf . subalata r 



Goniophora minor r 



Paracyclas liratus r 



Actinopteria peristralis c 



Coleolus aciculum r 



Pleurotomaria capillaria r 



Pleurotomaria sulcomarginata c 



Murchisonia cf . leda r 



From central and eastern Pennsylvania the Ithaca fauna extends 

 southward across Maryland far into Virginia. The Portage and 

 Ithaca faunas occupy the same relative stratigraphic and geo- 

 graphic positions in this southerly area 1 as in New York state, 

 the former having its maximum development to the westward of 

 and parallel with the Ithaca fauna. Evidence that Tropidoleptus 

 carinatus lived during Portage time near the eastern margin of the 

 Appalachian Sea in Virginia as well as in Pennsylvania and New 

 York is furnished by a collection representing the Ithaca fauna 

 which the writer made at Bells Valley, Virginia. In this collec- 

 tion T. carinatus is a very abundant species, while another pre- 

 Portage species, Rhipidomella vanuxemi, occurs sparingly with it. 



The relation which Tropidoleptus carinatus bears to Hamilton, 

 Portage, and Chemung sediments may be illustrated by the 

 accompanying diagram which shows the easterly restriction of the 

 species in New York during Portage time and the westerly exten- 

 sion of its habitat during Chemung time. The easterly or coast- 

 wise restriction of the species at the close of the Hamilton could 

 be graphically shown for Pennsylvania and Maryland by diagrams 

 of similar character, except that the Tully limestone would be 

 omitted. 



J E. M. Kindle, Bull. U.S. Geol. Survey No. 244 (1905), 35, 41, faunules 1380S 

 and 1382D; Charles K. Swartz, Jour. Geology, XVI (1908), 328-46. 



