Report of a Reconnaissance of the North-West Provinces and Indian Territories of the Dominion of Canada, and Narrative of Journey Across the Continent Through Canadian Territory to British Columbia and Vancouver Island

1873 ◽  
Vol 17 (74) ◽  
pp. 543-567
Author(s):  
Robertson Ross
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
North West ◽  
The North

Tsunami Deposits Beneath Tidal Marshes on Northwestern Vancouver Island, British Columbia

1997 ◽  
Vol 48 (2) ◽  
pp. 192-204 ◽  
Author(s):  
Boyd E. Benson ◽  
Kurt A. Grimm ◽  
John J. Clague
Keyword(s):  
British Columbia ◽  
Plate Boundary ◽  
Vancouver Island ◽  
Tidal Marshes ◽  
Tsunami Source ◽  
Cascadia Subduction Zone ◽  
Tsunami Deposits ◽  
The North ◽  
Sand Sheet ◽  
Sand Sheets

AbstractTwo sand sheets underlying tidal marshes at Fair Harbour, Neroutsos Inlet, and Koprino Harbour on the northwestern coast of Vancouver Island, British Columbia, were probably deposited by tsunamis. The sand sheets become thinner and finer-grained landward, drape former land surfaces, contain marine microfossils, are locally graded or internally stratified, and can be correlated with earthquakes that generated tsunamis in the region. 137Cs dating and historical accounts indicate that the upper sand sheet was deposited by the tsunami from the great Alaska earthquake in 1964. Radiocarbon ages on plant fossils within and on top of the lower sand sheet show that it was deposited sometime after about A.D. 1660. We attribute the lower sand sheet to a tsunami from the most recent plate-boundary earthquake on the Cascadia subduction zone about 300 yr ago, extending the documented effects of this earthquake north of the Nootka fault zone. The 1964 tsunami deposits differ little in thickness and continuity among the three marshes. In contrast, the lower sand sheet becomes thinner and less continuous to the north, implying a tsunami source south of the study area.

The 1946 Mount Colonel Foster rock avalanche and associated displacement wave, Vancouver Island, British Columbia

1989 ◽  
Vol 26 (3) ◽  
pp. 447-452 ◽  
Author(s):  
Stephen G. Evans
Keyword(s):  
British Columbia ◽  
Rock Avalanche ◽  
Vancouver Island ◽  
Wave Crest ◽  
Canadian Cordillera ◽  
Mountainous Terrain ◽  
The North ◽  
Displacement Wave ◽  
Volcaniclastic Rocks ◽  
Landslide Lake

The 1946 Vancouver Island earthquake (M = 7.2) triggered a rock avalanche from the north face of Mount Colonel Foster, central Vancouver Island, British Columbia. Approximately 1.5 × 106 m3 of Triassic volcaniclastic rocks detached from between el. 1965 m and el. 1600 m. Although just over half of this volume was deposited in the upper part of the track above el. 1080 m, approximately 0.7 × 106 m3 descended the lower part of the track and entered the waters of Landslide Lake at el. 890 m. The resultant displacement wave ran up a maximum vertical distance of 51 m on the opposite shore and the wave crest was about 29 m high when it spilled over the lip of the lake. Water displaced during the event destroyed forest in the upper reaches of the Elk River valley up to 3 km from Landslide Lake. The wave at Landslide Lake is comparable to other waves generated by similar magnitude rock avalanches in Peru and Norway and it is the largest recorded in the Canadian Cordillera. The case history illustrates the conditions where substantial damage may be caused by a rock avalanche well beyond the limits of its debris when it produces a landslide-generated wave in the mountainous terrain of the Cordillera. Key words: rock avalanche, earthquake-induced landslides, landslide-generated waves, mountains.

Compass Observations on a Cruise through the North-west Passage

1955 ◽  
Vol 8 (1) ◽  
pp. 59-66
Author(s):  
E. M. Penton
Keyword(s):  
British Columbia ◽  
Nova Scotia ◽  
Canadian Arctic ◽  
Scientific Work ◽  
North West ◽  
The North ◽  
Hydrographic Surveying

On 23 July 1954, the new Canadian Icebreaking Patrol Vessel H.M.C.S. Labrador (6000 tons) left Halifax, Nova Scotia, on her maiden voyage in support of the annual ship supply mission to the Canadian Arctic bases. In addition she carried out much hydrographic surveying and other scientific work, and subsequently withdrew to the westward, arriving at Esquimalt, British Columbia, on 27 September, thus becoming the first warship to complete the North-west Passage.

VII.—Sketch of the Geology of British Columbia

1881 ◽  
Vol 8 (5) ◽  
pp. 214-227
Author(s):  
George M. Dawson
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Fossil Plants ◽  
North East ◽  
The North ◽  
Time Spread

Cretaceous.—Lying everywhere quite unconformably below the Tertiary beds are the Cretaceous rocks, which constitute on the coast the true Coal-bearing horizon of British Columbia. These rocks probably at one time spread much more widely along the coast than they now do, but have since been folded and disturbed during the continuation of the process of mountain elevation, and have been much reduced by denudation. Their most important area, including the coal-rnining regions of Nanaimo and Comox, may be described as forming a narrow trough along the north-east border of Vancouver Island, 130 miles in length. The rocks are sandstones, conglomerates, and shales. They hold abundance of fossil plants and marine shells in some places, and in appearance and degree of induration much resemble the true Carboniferous rocks of some parts of Eastern America.

The North-West Mounted Police and British Columbia

1949 ◽  
Vol 18 (3) ◽  
pp. 345-361
Author(s):  
Walter N. Sage
Keyword(s):  
British Columbia ◽  
North West ◽  
The North

SEM and TEM observations of sperm development in the testis of the freshwater fish Oreochromis mossambicus

1990 ◽  
Vol 48 (3) ◽  
pp. 58-59
Author(s):  
Daryl A. Cornish ◽  
George L. Smit
Keyword(s):  
Morphological Characteristics ◽  
Oreochromis Mossambicus ◽  
Breeding Cycle ◽  
Limited Information ◽  
North West ◽  
The North ◽  
Sem And Tem ◽  
Sperm Development ◽  
Ultrastructural Characteristics ◽  
The University

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.

Sign in / Sign up

Export Citation Format

Share Document