HONEYMAX — ON NOVA SCOTIAN GEOLOGY. ooS 



granitoid cliorite. Vide Transactions 1^1 2-1 ?>. I have not found 

 it in connection with the •' Upper Arisaig Series." 



In slates and shales, No. 6, I found abundance of fo8sih<. The 

 prevalence of Lingula and Orthis testudinaria led me at first to 

 think that I had found a formation corresponding in age with my 

 lingula beds in the County of Pictou, or the B. of my Upper 

 Arisaig Series. The farther discovery of Graptolites, led me to 

 suppose that we had the equivalent of the graptolite shales of 

 Doctor's Brook, Arisaig Township, or the lowest part of B. of 

 Arisaig, or the base of the Lower Clinton. One difficulty in the 

 way of this correlation, arises from the absence of A. Arisaig or the 

 Mayhill sandstone equivalent. Wherever the lower members of 

 the Upper Arisaig Series are found in Eastern Nova Scotia this is 

 always present. Supposing, however, that. this case may ];e excep- 

 tional. With a few exceptions the fauna are different from the 

 familiar forms of the Arisaig series. The exceptions are Calymene 

 Bhim en b achii, Terehratula ajffinis^ Stro2:)ho7nena de p ressa. 

 These are Lower, Middle and Upper Silurian forms and indicate no 

 particular Silurian horizon. Orthis testudinaria is a form of very 

 frequent occurrence occurs in the B' or Upper Clinton of Arisaig, 

 but it is also a Lower Silurian form. Diprionidean forms of 

 graptolites, e. g. Climacograpsus occur in the Doctor's Brook 

 shales, or the base of B. of Arisaig, Lower Clinton. The existence 

 of Climacograpsus at Doctor's Brook was a palasontological diffi- 

 culty, in the way of correlating the containing strata. Prof. James 

 Hall in his w^ork, ** On the Graptolites of the Quebec Group," 

 makes the Hudson River group the Upper limit of this f«rm, Vide 

 Table, This led me in my paper ' ' On the Geology of Antigonish 

 County," to regard B of Arisaig as of Hudson River age, and A as . 

 Utica State. 



Subsequently, however, I came to regard the graptolites of 

 Doctor's Brook as a colony from the Hudson River — Lower Sil- 

 urian. I was led to this conclusion when I made a systematic and 



Note. — This form of diorite occurs frequently in the Huronian rocks of St. 

 John, N. B., and also associated with tlie Lower Silurian slates at the end of the 

 ^fifispec Road near the old Ei>is copal Cemetry. 



