HUDSON RIVER BEDS NEAR ALBANY 503 



identified as Diplograptus mucronatus, but unques- 

 tionably a new species, is one of the small mucronate forms of 

 the Utica shale not occurring in the Normans kill fauna. 



S. W. Ford 



In the next year, the untiring collector, S. W. Ford, reported 

 the discovery of another interesting locality at Schodack Land- 

 ing, to the southeast of Albany, on the east bank of the Hudson 

 river (29). 



He found the slates excellently exposed, though bent and con- 

 torted almost beyond description, in two promontories, where a 

 band of black slates yielded the characteristic Normans kill 

 fauna, and ^^at once resolved to institute a careful search for 

 other fossils in the rocks of the neighborhood'^; in which endeavor 

 he was very successful, for a bed of limestone about 2 feet thick, 

 and in part somewhat brecciated in appearance, inclosed in the 

 slates, was found. This yielded the following species: 

 Asaphus platycephalus, Oalymene senaria, 

 Orthis testudinaria, O. lynx,Leptaena sericea, 

 Strophomena alternata and the hemispheric form of 

 Chaetetes lycoperdon. He concluded : " None of the 

 species of this locality are distinctive of the Utica slate, and both 

 the limestone and its associated graptolitic slates represent in my 

 estimation the Hudson river group." These fossils are, however, 

 not restricted to the Hudson river group and would prove only 

 that the Normans kill graptolite shales may belong anywhere 

 from the base of the Trenton to the Lorraine beds. 



In another paper (30), Ford discussed the age of the slaty and 

 arenaceous rocks in the vicinity of Schenectady, which by Mather, 

 Emmons and Whitfield have been considered to be of Lorraine 

 age. Ford found at Schenectady G-raptolithus pristis, 

 Gr. mucronatus (that is, a mucronate Diplograptus), 

 Tria rthrusbecki and a L i n g u 1 a, which he considers 

 tobeLingulacurta. On the strength of this evidence he 

 regards the Schenectady beds as of Utica age. This result, if 

 fartb^? verified, would be tot^^^stin!^ m so far as it tsvould show 



