The Geology of the O. and P. S. Railway. 169 



valley of the Bonnechere River to the vicinity of Douglas. To 

 the north of this valley the rocks are crystalline of the old 

 series, comprising both limestones and gneisses as well as 

 frequent masses of granite. Similar rocks occur to the south of 

 the railway, but approaching Douglas it skirts the south side 

 of a large outlier of the Black River formation and several 

 quarries are here located in these rocks. In these the charac- 

 teristic fossils are quite abundant and a careful study of the 

 several strata will amply repay the collector. To the north of 

 Douglas village also these rocks are well exposed, and will yield 

 good results. 



From Douglas to Caldwell the rocks are of the old series, 

 being well exposed near the latter station. Occasionally 

 pyroxenic rocks are seen with these, and traces of various 

 minerals were observed at several points, but not in quantity to 

 be of economic importance. But little exploration has yet been 

 done in this area for minerals as yet, and it is possible that sub- 

 sequent search may be more successful. The road passes about 

 a mile to the south of Eganville which is on the Bonnechere 

 River ; but before reaching Eganville station it crosses another 

 very considerable outlier of the Black River formation, which 

 extends northward to the river and also presents a good field to 

 the fossil collector. At Eganville itself the Chazy also appears, 

 and the presence of several small faults along the valley of the 

 stream tends to complicate the structure and make the study 

 more interesting. To the south of Eganville, at Clear Lake, a 

 very interesting mineralogical field is presented, and several 

 islands in this lake have afforded a rich collecting ground for 

 mineralogists both from the United States and Canada for 

 some years, and some very rare and valuable minerals have been 

 obtained. A very interesting outlier of Utica Shale was found 

 several years ago by the officers of the Geological Survey on 

 the north slope of the mountain which rises from the south shore 

 of the lake, at an elevation of about 800 feet above the sea. 



The valley of the Bonnechere west of Renfrew, and nearly 

 to Douglas, is occupied by heavy deposits of clay. These must 



