614 NEW YORK STATE MUSEUM 



laceous and arenaceous shales with beds of argillaceous sand- 

 stone and gritty bands. These rocks have, in many places, be- 

 come semi-metamorphic {'' glazed shales " of the older New York 

 geologists) by the influence of the orogenic forces. Fossils from 

 them were known to Vanuxem, and the species reported by Hall 

 (7) have been enumerated above (p. 493). Walcott remarks that 

 this fauna connects the shales of the Hudson valley region with 

 the Frankfort shale fauna of the central part of the state. 



The writer had the good fortune to find an excellent oppor- 

 tunity for collecting in the usually very refractory shales by the 

 opening of ditches for the purpose of laying water pipes in the 

 southern part of Waterford. Here, at the end of Grace street, 

 near the Mohawk, beds of dark argillaceous shales, changing 

 through dark sandy shales into ferruginous sandstones, were cut 

 into. They furnished: 



Glyptocrinjus decadactylus, Hall, uumerous joints 

 Ddplograptus putillus, Hall^ several specimens!^ 



^This small form was originally described by Hall (11:44) from tbe 

 " Hudson river group of Iowa ", and is also cited by Schucliert from the 

 " Hudson river group " near Granger and near Springvalley Minn., and 

 from Graf la. One of Hall's types is reported in Whitfield & Hovey's 

 catalogue (61) to have come from Dubuque la. According to Gurley's 

 lists the form is restricted to the Utica horizon (lower Maquoketa shales). 

 Sardesou (57) distinguishes the lower Maquoketa formation as " Diplo- 

 graptus-bed ". Though he does not give any identification of the Diplo- 

 graptus, it becomes apparent from the localities of this horizon, mentioned 

 by him (Graf la. and Granger Minn.) that Hall's and" Schuchert's 

 specimens were also obtained from this horizon. The writer's observations 

 on the vertical range of this form in the east agree well with these data; 

 for D. putillus has been found to be common in the Utica shale of cer- 

 tain parts of the Mohawk valley, specially north of Utica and near the 

 village of Mohawk; and I have recently found it in great abundance, 

 together with Orthograptus quadrimucronatus, Oory- 

 noides curtus and a minute, uudescribed spinous Diplograp- 

 t u s , in the Utica shales directly above the Trenton limestone in the 

 beautiful section along the shore of Lake Ghamplain near Panton Vt., to 

 which interesting locality the writer's attention was kindly directed by 

 Dr Theodore White of Columbia university. 



The form may, however, as its occiirrence at Waterford proves, pass 

 into the Lorraine beds» 



