HONEYMAN — OJnT NOVA SCOTIAN GEOLOGY. 13 



Arisaig cove, all the organisms that I found originally at Doctor's 

 Brook in great number and in a better state of preservation, with 

 corals of species different from any heretofore found in the Nova 

 Scotian rocks, abundance of crinoids and trizobites of genera 

 Phacops, and Caiymene, in fine preservation, and Graptolites. 

 This discovery shewed that the strata which I had before described 

 as poor in fossils was on the contrary rather rich, and that the 

 circumstances under which these shales originated were favorable to 

 the existence of animal life. 



In the succeeding strata or the Lower Arisaig of Dawson or 

 Clinton equivalent, I found two specimens of Conularia. I had 

 found the same organism in the same horizon at French River. 

 These are the only instances in which this pteropod has been found 

 in a position lower than the lower carboniferous in Nova Scotia. 

 I would here observe that Dana in his list of foreiorn Silurian fossils 

 not yet met w^ith in America, specifies the Grammy sia cingulata. 

 By referring to my catalogue of the fossils found in the Arisaig 

 Clinton, it will be there observed. Salter recognized it in my 

 collection of the London Exhibition of 1862. I also succeeded in 

 extending the Lower Arisaig farther to the east of Doctor's Brook, 

 i. e. to the mouth of McNeil's brook, any farther extension of these 

 in this direction must pass into the Strait of Northumberland. 



In the beautiful section of the Arisaig rocks on the shore, a 

 little to the east of McAra's Brook, there appears a set of red 

 strata dipping in a different direction from the variegated strata or 

 Lower Helderberg. As far as I can ascertain this red band of 

 argillites is non-fossiliferous. I found these strata dipping regu- 

 larly in McAra's Brook and beyond it, and therefore of consider- 

 able thickness. They are also found in Mc Adams' Brook to the 

 east of McAras' Brook. They are certainly not Lower Helderberg 

 and may therefore be Devonian. I would name them the McAra's 

 Brook strata. Upon these the Lower Carboniferous conglomerates 

 lie unconformably — the line of junction being behind a mass of 

 amygdaloid. In my paper on Arisaig, I designated the Doctor's 

 Brook Graptolite, and Lingula Shales B, and Dawson's Lower 

 Arisaig B with an accent. There is a marked difference between 

 the two sets of strata in structure. At the mouth of Arisaisr 



