132 NEW YORK STATE MUSEUM 



be more abundant in the eastern deposits of the region than in the 

 western where the species from the interior would hold sway. 

 H a 1 y s i t e s c a t e n u 1 a t u s is one of these species, which is 

 extremely characteristic of the Cobleskill of the Rosendale cement 

 region, but Hartnagel records it from only one locality in the Scho- 

 harie region, i. e. northeast of Howes Cave. Again some of the 

 characteristic western species, such as Spirifer eriensis, 

 S. corallinensis, Trochoceras gebhardi and 

 Leperditia scalaris, while common in the Schoharie 

 region, are absent in the Cobleskill of the Hudson valley. S . 

 corallinensis and S. eriensis occur however in the 

 uppermost Manlius of Becraft mountain,^ showing that by the 

 end of Manlius time these species had made their way east to the 

 Hudson valley. 



^Grabau, Stratigraphy of Becraft Mountain. N. Y. State Paleontol. An, 

 Rep't for 1902; N. Y. State Mus. Bnl. 69, p. 1042 



