46 



FOSSIL MEDUSA. 





Sk 



:■'. >;-. 



k 





or decomposed prior to final burial in the mud, than the Middle Cambrian 

 Brooksella and Laotira. 



In addition to the large number of specimens obtained on the slabs of 

 slate in the sidewalks of Middle Granville, I collected a series of fine speci- 

 mens from the greenish-colored roofing slate at the middle Penrhyn quarry, 

 just west of the upper end of the village. At this quarry the cleavage of 

 the slate is coincident with the bedding. The vertical range of the medusa? 



is through a band of slate about 

 f ~~ \ 6 feet thick that occurs in the 



face of the quarry, about 50 feet 

 above the lowest bed quarried. 

 It is only when this portion of 

 the quarry is being worked that 

 specimens can be obtained. 

 Through the courtesy of the 

 superintendent in charge, Mr. 

 Edward Willis, of New York, I 

 was notified at the time the 

 quarrymen were taking down a 

 new cut that passed through 

 the medusa bed. 



The gregarious habit of this species is shown by the occurrence of 42 

 specimens on the surface of a slab of slate 37 by 62 inches, 19 on a slab 

 26 by 49 inches, and 11 on a slab 27 by 38 inches. 



Formation and locality. — Lower Cambrian; Penrhyn quarry, Middle Gran- 

 ville, Washington County, New York. 



Dactyloidites astekoides in Vermont. 



- 



Fig. 15. — DaciyloidUrs attteroides from Parker's quarry, 

 Georgia, Vermont. 



I recently received from Mr. G. E. Edson, of St. Albans, Vermont, an 

 impression of a star-like fossil which he found at Parker's quarry, Georgia, 

 Vermont, in the coarse Olenellus shales. He calls attention to its resem- 

 blance to Dactyloidites asteroides, and I am inclined to think that this identi- 

 fication is correct. The impression is quite clearly defined on the somewhat 

 rough, arenaceous shale, and the interior canals are clearly shown in three 

 of the lobes. The specimen is represented in text fig. 15. 



