Additions to the Museum Collections, in Geology 



and PalcBontology, made in connection 



with work on the Geological map. 



Durino; the early autumn a new locality of Graptolites was dis- 

 covered in the vicinity of Hudson, ]N^. Y., on the south-western 

 ""ace of Merino Mountain, and a considerable collection has been 

 lade therefrom. The collection amounts to about 1,000 specimens, 

 hich have been arranged in drawers in the upper story of the 

 rate Hall. The discovery of this locality is interesting as fur- 

 ishing the same species of Graptolites as those published in 

 olume I of the Palasontology of ]N"ew York, in 1847; and the 

 >lates are in similar condition. The original specimens were 

 btained from comparatively small masses and sometimes only a 

 nv thin lamina of black slate infolded and incorporated in the 

 ontorted and partially altered gray slates of the Pludson Eiver 

 roup at the outlet of the Xormans Kill. This locality has for many 

 oars been inaccessible on account of buildings having been 

 rected on the ground ; and no other similar locality had been 

 3und preserving the same species in like condition and in slates 

 f the same physical character. 



These forms were originally referred to the horizon of the Utica 

 ate, although it was not possible to obtain any exposure showing 

 le actual stratigraphical relations. During later years some 

 iiestion has been raised regarding the correctness of this refer- 

 ice, the suggestion having been made that the inclosed black 

 ates at the ]S"ormans Kill might have been derived from an older 

 )rmation and involved in Hudson shales during their folding 

 nd uplifting. 



The locality at Hudson presents a clear outcrop in an escarp- 

 ment, showing the shaly beds in such relations to the upper 



