PORTAGE AND CHEMUNG FORMATIONS OF MARYLAND 341 



Clarke^ as frequently present in it in New York. It contains one 

 species, Pterinea chemungensis, which is stated by Williams to be char- 

 acteristic of the Chemung of New York.^ This species is, however, 

 cited from the Ithaca of New York by Clarke^ and is quoted by Wil- 

 liams and Kindle'^ in what they regard as the Ithaca fauna in the Cata- 

 wissa, Pa., fauna. The occurrence of this species therefore does not 

 seem sufficient to determine the Chemung age of the fauna. All the 

 species contained in the list, save one, are found in the Ithaca fauna 

 of New York, 5 and that exception, Ectenodesma birostratum, is found 

 in the Ithaca fauna in the section at Catawissa, Pa.*^ These facts 

 would seem to indicate the Ithaca age of this fauna. 



It is interesting to note that Ectenodesma birostratum and Pterinea 

 chemungensis are restricted to the upper zone of the Ithaca fauna of 

 the Catawissa section, and are also restricted to the upper zone of the 

 fauna in Maryland. Indeed, there are numerous resemblances 

 between the upper horizons of the two sections. 



There is also a resemblance between this fauna and the Leiorhyn- 

 chus globuliforme fauna found above the Oneonta sandstone of New 

 York, as shown by the following list of species of brachiopods occur- 

 ring at Cowles Hill, Greene, New York.' 



Airy pa reticularis 



Schizophoria impressa (=5. Striatula) 



Leiorhynchus globuliforme 



Spirifer mucronatus ( = pennatus) var. 



Productella speciosa 



Stropheodonta demissa 



Spirifer laevis 



Cyrtina recta 



Leptostrophia mucronata 



The resemblance is very close. It will be noted that Spirifer laevis is 

 quoted by Kindle and Williams from the upper zone of the Ithaca 



1 Ithaca Fauna of Central New York, Bulletin 82, N. Y. State Mus., p. 64, 1905. 



2 Journal of Geology, Vol. XV, p. 98, 1907. 



3 Bulletin 82, N. Y. State Museum, p. 62, 1905. 



4 Bulletin of the U. S. Geological Survey, No. 244, p. 77, 1905. 



5 Bulletin 82, N. Y. State Mus., pp. 61-65, i9°S- 



^ Kindle and Williams, Bulletin of the U. S. Geological Survey, No. 244, p. 77, 

 1905. 



T 4Qth Ann. Rept. for 1895, N. Y. State Museum, Vol. II, pp. 36-38, 1898. 



