HONEYMAN GEOLOGY OF AMTIGONISH COUNTY. 115 



in the Province where the lower carboniferous limestone is found 

 to contain the trilobite, the PMllijpsia Howi having been found by 

 Dr. How in the Kennetcook limestone in 1862. These limestones 

 in the possession of this genus of trilobite, correspond wath the 

 mountain limestone of the British Isles, so that the one and the 

 other are undoubtedly approximately contemporaneous. Succeed- 

 ing the conglomerates of the Antigonish mountains and reposing 

 directly upon them, we have limestone of considerable thickness ; 

 this can easily be traced continuously from the Marshy Hope to 

 Morristown, a distance of about sixteen miles. In several places 

 where it is quarried for building stone, large deposits of brown 

 ochre are found, and the slabs are often coloured with films of car- 

 Jbonate of copper, and in one quarry where Braley brook issues 

 from the mountains, I found some years ago imbedded in ochre 

 several pieces of copper pyrites of considerable size. 



Succeedinar these limestones of the Antigonish mountains, we 

 have an enormous bed of gypsum ; its length is nearly equal to 

 that of its associated limestone. It appears at the forks of James' 

 river and the Ohio river ; it passes over nearly in the course of 

 James river until it reaches within one hundred paces of the lime- 

 stones ; its mountain side runs parallel with the limestones, Braley 

 brook running between and along the bottom of the abrupt and 

 lofty gypseous wall for about three miles. After parting with the 

 brook the gypsum pursues its course until it reaches Right's river, 

 nearly a mile north of the town. After an apparent break of 

 two miles it again appears on the east side of the Sugar Loaf and 

 proceeds onwards into St. George's bay, its land terminus being" 

 Ogden's lofty cliff. 



Dr. Dawson shows this cliff in a plate in his Acadian Geology , 

 where he examines very fully and satisfactorily the gypseous forma- 

 tion from Right's river to St. George's bay, so that in examining 

 this part v/e traverse the ground which he has already rendered 

 so familiar to the geologist. The breadth of this great gypsum 

 deposit is duly proportioned to its length. It stretches from the 

 mountains at North river, through the harbour and up the west side 

 of South river, presenting at its southern terminus as well as on either 

 side of the harbour and elsewhere in its course, a striking conical 

 aspect. The southern terminus is seen by the traveller on the 



