S22 HGNEYMAN ON THE HISTORY OF A BOULDEE. 



Hall. The abundance of boulders led to the belief that the rocks 

 which produced them were at no great distance. Shortly after the 

 discovery of the boulder, I had made another discovery. In a road 

 cuttins:, at the brido;e of a branch of French River, east from the 

 site of our boulder, are soft shales locally known as " pencil stone." 

 In these I found Graptolithus Clintonensis — Hall. This is the 

 only locality where this fossil has been found away from Arisaig. 

 It indicates the Clinton age of New York, or Middle Silurian. In 

 addition these shales produce several trilobites — several braehio- 

 pods, e. g. Leptocoelia intermedia — Hall, Leptaena depressa, 

 Lingula ohlonga, Discina, Cornulites, or tubiculous worms, a 

 Conularia, Pteropods, and an Orthoceras, a cephalopod. This, 

 I have elsewhere named Upper Clinton, W. — In another road 

 cutting at Barney's River, and yet another on a branch of the same 

 river, to the east, I found abundance of nodules — -all with one or 

 two exceptions encasing beautiful Linguloe of several species. 

 This is the second of three localities where beds oi Lingula nodules 

 have been found. The first is Arisaig, the second is Barney's 

 River, and the third Sutherland's River. These shales I have in my 

 *' Geology of Arisaig" characterized as B, and elsewhere as Lower 

 Clinton. 



In the bed of French River and at the road side at Barney's 

 River, I found boulders with JPetraia, and trumpet-shaped Oornn^ 

 lites. Here was evidence of the existence of still lower strata, or 

 the A strata of Arisaig. After search the strata whence these were 

 derived, were found up Barney's River. Here was bold and solid 

 strata, forming flanks of the mountains. Here I found nearly as 

 great a variety of fossils, as in the corresponding strata A of 

 Arisaig. — These are found extending eastward to Marshy Hope, 

 and westward to French River. They underlie the Lower Clinton 

 and Upper Clinton shales, already referred to, and overlie Crys- 

 talline rocks — Syenites, Lower Arisaig Series. 



The Clinton strata from Marshy Hope to French River, west- 

 ward, are overlaid by Lower Carboniferous. Here, then, there is 

 an irregularity in succession — the Upper Silurian and Devonian 

 being absent. 



The strata which produced our boulder yet remained undiscovered. 



