HUDSON RIVER BEDS NEAR ALBANY 529 



Eopoljchaetus albanienisis sp. n. 



PontO'bdellopsis cometa sp. n?- 



Leptobolus imsignis, Hall 



(Schizambon (?) fissus var. canadensis Ami 



Hormotoma cf. gracilis, HaU ep. 



With the exception of Dendrograptus, which at this 

 locality is of rare occurrence, all graptolites of this fauna were 

 found in the lowest Utica shale at Panton Vt. As the same 

 combination of graptolites has also been observed on slabs from 

 the neighborhood of Amsterdam N. Y., it seems to constitute a 

 faunule characteristic of a certain horizon of the Utica shale 

 in New York, evidently of the lower part of the formation. In 

 all three localities the graptolites are rarely found mixed but 

 occur on different surfaces of closely adjoining layers; only the 

 rarer D. spinulosus mingling with the others, as if they 

 were assorted according to their weight while drifting about. 

 The other graptolites of the Utica shale occur for the most part 

 separately in the shales of the Mohawk valley; this is specially 

 notable of Olimacograptus typicalis, CI . b i c o r - 

 XL is and Dip 1 ogr apt us ruedemanni. 



Station 15. Old Dudley observatory, Albany 



3 miles S SW of the Rural cemetery exposure and just north 

 of Albany, on Patroon's creek near the old Dudley observatory 

 (station 15) is the exposure from where Dr Beecher, in 1889, ob- 

 tained the first unmistakable Utica fauna from the Hudson river 

 ehales (see p. 50'2). 



whole is more slender and flexible (only .1 mm wide), but its thickest basal 

 parts correspond in thickness to the terminal parts of that extremely 

 delicate graptolite whose thin filiform ends also show at times an inclina- 

 tion to become convolute. Furthermore most of the branches possess the 

 game smooth, unindented character and apparently, though not distinct 

 enough to permit positive assertion, small pits along the median line. In 

 the absence of more complete material, it seems therefore justifiable to 

 consider this fossil as consisting of the broken, thin filiform ends of 

 Dendrograptus tenuiramosusora similar species. 

 ^See description of these fossils p. 574. 



