TRANSACTIONS OF SECTION C. 717 



indicates the presence of pyroxenite ; but the latter is often found without the 

 former. 



The apatite extracted from these deposits varies greatly in quantity; some- 

 yielding a few hundred pounds, others a few tons, and so up to over 7,000 tons 

 from the largest worked deposit, which is still being worked. 



It has been met with in pyroxenite having a schistose structure in masses of 

 from a few pounds to a few tons between the irregular layers. 



Deposits of apatite have been met with which, on the surface soil beinr.- 

 removed, showed a length of, say, ten times the width ; where the width is, say, 

 four feet the length would be, say, forty feet, narrowing towards the ends. On 

 being worked it generally happened that both the width and the length gradually 

 decreased until the deposit ran out or left only a narrow streak of apatite ; giving 

 one the impression that the deposit was the segment of an irregular circular form 

 of which the greater part had been cut off. The strike is generally that of the 

 neighbourhood, and the mineral usually separated cleanly from one wall, buS 

 seldom from both. One might fancy such a deposit had been squeezed into a bed- 

 like form. 



Mining has extended to a depth of 130 feet, but by far the greater quantity 

 has been taken from surface workings — workings open to daylight. 



7. On the Occurrence of the Noriuegian ' Apatithringer ' in Canada, with a 

 few notes on the microscopic characters of some Laurentian Amphibolites: 

 By Frank D. Adams, M.Ap.Sc 



The author first gave a short account of the investigations which have been 

 made on this amphibole-scapolite rock in Norway, where all the principal deposits 

 of apatite either traverse it or occur in its immediate vicinity. The deposits of 

 apatite in Canada generally occur associated with some variety of highly pyroxenic 

 rock, often holding orthoclase and quartz. 



The ' Apatitbringer ' has, however, recently been found in the vicinity of the- 

 town of Arnprior on the River Ottawa. It closely resembles the Norwegian rock, 

 both in external appearance and in its microscopic characters, containing horn- 

 blende, scapolite, and pyroxene as essential constituents. A number of amphibo- 

 lites in the museum of the Geological Survey of Canada, which resemble this rock 

 in appearance, have been sliced and examined with the microscope, and one of them 

 found to contain scapolite in large amount. It was collected at Mazinaw Lake, in 

 the township of Abiuger, and is from the same belt of hornblendic rocks as that in 

 which Arnprior is situated. The paper closed with a short account of some cf 

 these amphibolites. 



8. On the Acadian Basin in American Geology. 

 By L. W. Bailey, M.A., F.E.S.C. 



The Acadian Basin, embracing the region bordering on and including the Gulf 

 of St. Lawrence, together with the provinces of New Brunswick, Nova Scotia,. 

 Newfoundland, and Prince Edward Island, constitutes one of the natural physical 

 divisions of the continent of North America, and exhibits many marked peculiari- 

 ties of climate and floral and faunal distribution. In its geological structure, and 

 in the history which this reveals, its individuality is not less clearly marked, 

 being often in strong contrast with that of other portions of the continent farther- 

 west ; and in some periods and features even exhibiting a closer relationship with 

 the geology of Europe. In the present paper, the facts bearing upon this in- 

 dividuality are summarised and discussed; including the consideration of the 

 varying land-surfaces of Acadia in different eras, the time and nature of its physical 

 movements, its climate and its life. A review of recent progress in the investigation. 

 of its geological structure is also given. 



