1 8 The Ottawa Naturalist. 



which is also found at a number of places in the vicinity of 

 Ottawa, and which has been somewhat extensively mined in 

 recent years. Good illustrations of its mode of occurrence are 

 found at the mines on the east bank of the Gatineau, a short 

 distance below the Paugan Falls. The intrusive character of 

 the dioritec and granites can also be well studied at this place, 

 which may be said to form one of the most attractive spots for 

 excursions in the Gatineau River area. 



In the rocks at Old Chelsea opportunities were afforded for 

 the study of the mica and apatite deposits, while small quantities of 

 serpentine and renssellaerite are found just at the forks of the road 

 to King's Mountain. A handsome variety of red jasper, from 

 which fine specimens can be obtained, is found in the vicinity in 

 connection with one of the mica mines, and certain dykes of 

 pyroxene just to the north of Mr. Chamberlain's house, furnish 

 large numbers of pyroxene crystals, of which good specimens 

 can readily be collected. This locality is also a very interesting 

 one for geological work, and will readily furnish matter for 

 study for several excursions in this branch of the Club's work. 



The deposit of sands and clays in the cuttings north of 

 Chelsea station, on the Gatineau Valley railway, contains marine 

 shells from which collections were obtained by members of the 

 Club, and has already been referred to in a previous report. 



The limestone of Galetta resembles closely that of the 

 Paugan and Chelsea. Dykes of syenite and diorite cut these at 

 many points, and one of these, crossing the Ottawa River at the 

 Chats, near Fitzroy Harbor, causes the long chain of falls 

 opposite that village, which is regarded as one of finest pieces of 

 broken water anywhere on the Ottawa. This limestone is 

 probably the extension of the same belt seen on the Gatineau, 

 though its continuity is broken by great masses of syenite north 

 of the River Ottawa. At one place, about a mile north-east of 

 Galetta Village, a deposit of galena once mined, can be seen in 

 the limestones in close proximity to a large syenite dyke which 

 here cuts the strata. ^ -^ Fttc; 



W. F. Ferrier, 

 H. M. Ami. 



