PALAEOBOTANICAL STUDY OF LATE-GLACIAL DEPOSITS FROM VANCOUVER ISLAND, BRITISH COLUMBIA

1959 ◽  
Vol 37 (5) ◽  
pp. 815-817 ◽  
Author(s):  
J. Terasmae ◽  
J. G. Fyles
Keyword(s):  
British Columbia ◽  
Radiocarbon Dating ◽  
Late Glacial ◽  
Vancouver Island ◽  
River Section ◽  
Glacial Deposits ◽  
Palynological Study

Plant-bearing beds have been discovered by J. G. Fyles in late-glacial deposits from the Englishman River section, Vancouver Island, B.C. Radiocarbon dating indicated an age of ca. 12,000 years for these beds. Fossil cones of Pinus contoria Dougl. and leaves of Dryas drummondii Richards, were discovered and identified. Palynological study indicates that climate at the time was colder than the present.

The Cowichan Ice tongue, Vancouver Island

1968 ◽  
Vol 5 (6) ◽  
pp. 1409-1415 ◽  
Author(s):  
E. Carl Halstead
Keyword(s):  
British Columbia ◽  
Late Glacial ◽  
Vancouver Island ◽  
Glacial Deposits ◽  
Strait Of Georgia ◽  
Continuous Melting

The sequence of late glacial deposits within Cowichan Valley and on Saanich Peninsula, Vancouver Island, British Columbia, suggests the existence of an ice tongue that occupied Cowichan Valley and extended eastward to Saanich Peninsula prior to the merging with and being overridden by Cordilleran ice of the last major glaciation. Following the maximum advance of Cordilleran ice, continuous melting and downwasting prevailed, but before deglaciation was complete, remnant ice in Cowichan Valley was rejuvenated. Similar glacio-climatic events have been recognized elsewhere in the Strait of Georgia, and are named the Evans Creek Stade, the Vashon Stade, and the Sumas Stade of the Fraser glaciation. The writer tentatively applies these names to the events on Vancouver Island.

Holocene and latest Pleistocene cirque glaciations in the Shuswap Highland, British Columbia

1978 ◽  
Vol 15 (6) ◽  
pp. 865-873 ◽  
Author(s):  
J. M. Duford ◽  
G. D. Osborn
Keyword(s):  
British Columbia ◽  
Radiocarbon Dating ◽  
Volcanic Ash ◽  
Early Holocene ◽  
Glacial Deposits ◽  
Canadian Rockies ◽  
Radiocarbon Age ◽  
Recent Advances ◽  
The World

Ages of glacial deposits in cirques of the Shuswap Highland, British Columbia are approximated or bracketed using tephrochronology, radiocarbon dating and lichenometry. There is evidence for two minor Holocene glacial advances. The younger, named the Raft Mountain Advance, is defined by the type Raft Mountain moraine, which is about 100 years old judging from Rhizocarpon lichens. No volcanic ash is found on the moraine or its equivalents. The older, named the Dunn Peak Advance, is defined by the type Dunn Peak moraine and equivalent deposits in the Dunn Peak area. These deposits bear Mazama ash and are thus older than 6600 years; one of the moraines has a minimum radiocarbon age of about 7400 years. The deposits are younger than the Late Wisconsin deglaciation in southern B.C. (about 11 000 years BP). In addition, an earlier event, possibly a stillstand, is represented by a moraine (the Harper Creek moraine) downstream of the type Dunn Peak moraine. This moraine is also bracketed between 6600 and 11 000 years in age. The Dunn Peak Advance may be correlative with an Early Holocene Advance reported from the Canadian Rockies and northern American Rockies, and the Raft Mountain Advance is correlative with very recent advances reported from several parts of the world.

Optical Dating of Tsunami-Laid Sands

1996 ◽  
Vol 46 (2) ◽  
pp. 127-140 ◽  
Author(s):  
David J. Huntley ◽  
John J. Clague
Keyword(s):  
British Columbia ◽  
Radiocarbon Dating ◽  
Large Earthquake ◽  
Vancouver Island ◽  
Tsunami Source ◽  
Cascadia Subduction Zone ◽  
Stratigraphic Correlation ◽  
Optical Dating ◽  
Tsunami Measurements ◽  
Infrared Excitation

The ages of some tsunami deposits can be determined by optical dating, a key requirement being that the deposits are derived from sediment that was reworked and exposed to daylight by tidal currents, waves, wind, or bioturbation during the last years before the tsunami. Measurements have been made using 1.4 eV (infrared) excitation of K-feldspar grains separated from samples of prehistoric tsunami sand sheets and modern analogs of tsunami source sediments at four sites in Washington state and British Columbia. Source sands gave equivalent doses indicative of recent exposure to daylight. Tsunami sand at Cultus Bay, Washington, yielded an optical age of 1285 ± 95 yr (calendric years before A.D. 1995, ±1σ). At 2σ, this age overlaps the range of from 1030 to 1100 yr determined through a combination of high-precision radiocarbon dating and stratigraphic correlation. Tsunami sands at three sites near Tofino and Port Alberni on Vancouver Island, British Columbia, have optical ages of 260 ± 20, 325 ± 25, and 335 ± 45 yr. Historical records and radiocarbon dating show that the sand at each of the three sites is between 150 and 400 yr old. These optical ages support the hypothesis that the Vancouver Island sands were deposited by a tsunami generated by a large earthquake on the Cascadia subduction zone about 300 yr ago.

Late-glacial and postglacial vegetation history at Bear Cove Bog, northeast Vancouver Island, British Columbia

1983 ◽  
Vol 61 (12) ◽  
pp. 3172-3192 ◽  
Author(s):  
Richard J. Hebda
Keyword(s):  
British Columbia ◽  
Forest Canopy ◽  
Vegetation History ◽  
Late Glacial ◽  
Vancouver Island ◽  
Tsuga Heterophylla ◽  
Picea Sitchensis ◽  
Pteridium Aquilinum ◽  
Thuja Plicata ◽  
Blanket Bog

At 13 630 ± 310 BP (WAT-721) Port Hardy is the earliest area known to have been deglaciated at the end of the Fraser Glaciation on Vancouver Island. Pollen and macrofossil analyses of two cores from a basin–blanket bog show that about 14 000 years ago Pinus contorta, Alnus, and Pteridium aquilinum formed pioneering vegetation typical of post-ice environments on the Pacific Northwest coast. Climate is interpreted to have been relatively cool and dry. Picea sitchensis – Tsuga mertensiana forest succeeded at about 11 500 BP and persisted until about 10 000 BP. Climate was cool, moist, and maritime. Warming at about 10 000 BP permitted Tsuga heterophylla gradually to replace T. mertensiana. At 8800 BP Pseudotsuga menziesii migrated into the area and together with P. sitchensis dominated the forest. Abundant Pteridium aquilinum spores suggest forests were open. During the interval 8800 to 7000 BP the climate was warmer and drier than at present because today forests with Pseudotsuga do not extend as far north as Port Hardy. During this warm time, shallow ponds dried out. By 7000 BP Pseudotsuga declined and T. heterophylla and P. sitchensis dominated forests. Climate became wetter and cooler than in the preceding period but not as cool as today. About 3000 BP Cupressaceae, presumably both Thuja plicata and Chamaecyparis nootkatensis, shared the forest canopy with T. heterophylla. Sphagnum growth and bog development occurred after 7000 BP as climate became moister. The vegetation sequence described is a "maritime" type similar to sequences on the west coast of Washington State but unlike those from the Fraser Lowland. The xerothermic interval was of short duration between 8800 and 7000 BP but was expressed clearly in this area of moist maritime climate and therefore must have been of considerable amplitude. Vegetation differences between coastal and inland southwestern British Columbia were established by 11 500 BP.

The plainfin midshipman’s soundscape at two sites around Vancouver Island, British Columbia

2018 ◽  
Vol 603 ◽  
pp. 189-200 ◽  
Author(s):  
WD Halliday ◽  
MK Pine ◽  
APH Bose ◽  
S Balshine ◽  
F Juanes
Keyword(s):  
British Columbia ◽  
Vancouver Island

scholarly journals A rare genotype of Cryptococcus gattii caused the cryptococcosis outbreak on Vancouver Island (British Columbia, Canada)

2004 ◽  
Vol 101 (49) ◽  
pp. 17258-17263 ◽  
Author(s):  
S. E. Kidd ◽  
F. Hagen ◽  
R. L. Tscharke ◽  
M. Huynh ◽  
K. H. Bartlett ◽  
...  
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Cryptococcus Gattii

Eutardigrada from Vancouver Island, British Columbia, Canada, including a description of Platicrista cheleusis n.sp.

1990 ◽  
Vol 68 (9) ◽  
pp. 1880-1895 ◽  
Author(s):  
R. Deedee Kathman
Keyword(s):  
British Columbia ◽  
Vancouver Island

Thirty-one species of eutardigrades were collected on five mountains on Vancouver Island, British Columbia, during July 1986 and July 1987. Three of the species found were new to science, including 1 species, Platicrista cheleusis n.sp., described herein and 2 species described elsewhere, and 21 others are new to British Columbia; 13 of these are also new to Canada.

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