354 HONEYMAX ON NOVA SCOTIAN GEOLOGY. 



thorouoh examination of Arisaio^ in the summer of 1866. I then 

 extended the graptolite and lingula shales of Doctor's Brook to the 

 cove south of Arisaig Pier. Here I found the shales having a rich 

 and varied fauna. They vrere in close contact with the slates 

 and shales, v^^hose characteristic fossil is the Graptolithus clinton- 

 ensis, I found that w^hile the two setts of strata were lithologic- 

 ally distinct, the graptolithus clintonensis passed downwards into 

 the lower shales, and consequently I distinguished the latter B as 

 Lower Clinton, the former B' as Upper Clinton, and so regarded 

 the graptolites of Doctor's Brook as a colony. I regard the 

 climacograpsus of the slates of the Intercolonial Railway as char- 

 acteristic as the associated Lingulae are forms different from those 

 of the Upper Arisaig series. They strikingly resemble Trenton 

 Limestone and Hudson River forms. The other fauna are all 

 different from those of Arisaig, and are new to Nova Scotian 

 Palaeontology. I therefore distinguish this as the ** Went worth 

 Group," and regard the formation as approximately Hudson River, 

 U. S., or Bala, England. The position that I assign the group in 

 Nova Scotian Geology, is between the Upper and Lower Arisaig 

 series, ^. e. between the fossiliferous and crystalline. 



The Wentworth fauna of my collection are Orthoceras 2 sp. 

 Cyclonema^ Avicula^ Cyrtodoyita, Modiolopsis, Str op h omena, 

 LeptaenajChonetes, Camerella, Rhynchonella, Atrypa, Lingulae 

 DiscincB, GornuliteSf Tentaculites, A.saphus, Calymene, Dalma- 

 7iites^ Crinoid(Bi Graptolithus, Glimacograpsus. 



The Graptolites^ Lingulce and Discinae are beautifully pre- 

 served, many of the others have been pyritized, and the remainder 

 are in the form of casts. 



Preceding on the line of Railway we have, affcer the Wentworth 

 section an obscure interval between Little Whetstone Brook and 

 Big Whetstone Brook, and then two sections of metamorphic 

 rocks having a width of 2000 feet. 



Note. — Considering that rocks of the Intercolonial Railway have a greater 

 resemblance to those of Sainfc John Co., N. B. than to the eastern part of Nova 

 Scotia, with the exception of " Lower Arisaig," 1 am disposed to ally this part of 

 the Cobequids with Saint John, and to regard the Wentworth slates and their 

 fauna as the successors of the Saint John slates and their Primordial fauna 



