HUDSON RIVER BEDS NEAR ALBANY 52T 



of Utica age, and Walcolt declared it to represent in the whole 

 the upper Utica age of the Mohawk valley region. It is remark- 

 able for the considerable number of Lorraine forms on one hand 

 and the nearly as great number of Trenton forms on the other. 

 Some of these Lorraine forms were also observed in the very old 

 Utica beds of Mechaniosville, and their varietal differences fromi 

 the typical Lorraine forms remarked on. None of these Trenton 

 forms occur in the pure Lorraine faunas of Block island and 

 Waterford.i 



Station 11. Railroad station, Menands 



A few fos&ils were discovered by Dr Clarke in fissile argillar 

 ceous shales exposed in a small gravel pit about a hundred yards 

 north of Menands station. The fossils are: 



Dalmanella testudinaria, Dalman .sp. cc 



Plectorthis plicatella, Hall, c 



Plectambomtes sericea, Soioerhy ep. cc 



P. sericea var. aspera, James var. c 



Kafinesquina deltoidea, Conrad sp. rr > 



Archinacella patelliformis, Hall, c 



Bellerophon bilobartus, Hall, r , 



Spyroceras bilineatum, Hall, r 



Ctenobolbina ciliata, Emmons sp. r 



The presence of Plectorthis plicatella and S p y- 

 roceras bilineatum connects this f aunule with the 

 faunas of Green Island. 



Station 12. Devil's Den, Watervliet 



In a deep gorge, called Devil's Den (station 12), behind Gen. 

 Schuyler's historic home and half a mile west of Watervliet, 

 blackish and gray, fissile, soft argillaceous shales, somewhat 

 sandy toward the upper end of the gorge, are exposed for about 

 half a mile. These yielded a number of well preserved specimens 

 of Orthograptus quadrimucronatus, Hall sp. 



*The association of Trenton and Lorraine forms in the same beds, and 

 tlie peculiar position of these beds in the Utica zone will be discussed; 

 later (p. 564). 



