Bedrock geology of the Uncha Mountain area, northwestern Nechako River map area, central British Columbia

In Canada, Lemmon's Holly Fern, Polystichum lemmonii, is restricted to the Baldy Mountain area on the eastern side of the Okanagan River valley in south-central British Columbia. This population represents the northern limits of the species which ranges south through northern Idaho, Washington and Oregon to northern California. In British Columbia, P. lemmonii is associated with ultramafic rocky ridges within a montane forest at an elevation of 1900 m. The population in the Baldy Mountain area is relatively small, unprotected and potentially imperilled by mining exploration, forest road construction or wildfires.

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Bedrock geology, Burns Lake, British Columbia

10.4095/211092 ◽

2000 ◽

Author(s):

L C Struik ◽

K Fallas ◽

M G Hrudey ◽

J B Whalen

Keyword(s):

British Columbia ◽

Bedrock Geology

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Surficial geology, Gnawed Mountain area, British Columbia, parts of NTS 92-I/6, NTS 92-I/7, NTS 92-I/10, and NTS 92-I/11

10.4095/299383 ◽

2017 ◽

Author(s):

A Plouffe

Keyword(s):

British Columbia ◽

Mountain Area ◽

Surficial Geology ◽

I 11

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Eocene paleo-physiography and drainage directions, southern Interior Plateau, British Columbia

Canadian Journal of Earth Sciences ◽

10.1139/e04-062 ◽

2005 ◽

Vol 42 (2) ◽

pp. 215-230 ◽

Cited By ~ 28

Author(s):

Selina Tribe

Keyword(s):

British Columbia ◽

Middle Eocene ◽

Regional Scale ◽

River Valley ◽

Coast Mountains ◽

Base Level ◽

The North ◽

Bedrock Geology ◽

River Valleys ◽

Early Cenozoic

A map of reconstructed Eocene physiography and drainage directions is presented for the southern Interior Plateau region, British Columbia south of 53°N. Eocene landforms are inferred from the distribution and depositional paleoenvironment of Eocene rocks and from crosscutting relationships between regional-scale geomorphology and bedrock geology of known age. Eocene drainage directions are inferred from physiography, relief, and base level elevations of the sub-Eocene unconformity and the documented distribution, provenance, and paleocurrents of early Cenozoic fluvial sediments. The Eocene landscape of the southern Interior Plateau resembled its modern counterpart, with highlands, plains, and deeply incised drainages, except regional drainage was to the north. An anabranching valley system trending west and northwest from Quesnel and Shuswap Highlands, across the Cariboo Plateau to the Fraser River valley, contained north-flowing streams from Eocene to early Quaternary time. Other valleys dating back at least to Middle Eocene time include the North Thompson valley south of Clearwater, Thompson valley from Kamloops to Spences Bridge, the valley containing Nicola Lake, Bridge River valley, and Okanagan Lake valley. During the early Cenozoic, highlands existed where the Coast Mountains are today. Southward drainage along the modern Fraser, Chilcotin, and Thompson River valleys was established after the Late Miocene.

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Application of Apatite Fission-track Dating to the Study of Porphyry Type Mineral Deposits

Canadian Journal of Earth Sciences ◽

10.1139/e73-076 ◽

1973 ◽

Vol 10 (6) ◽

pp. 846-851

Author(s):

Peter A. Christopher

Keyword(s):

British Columbia ◽

Fission Track ◽

Yukon Territory ◽

Mineral Deposits ◽

Fission Track Dating ◽

Apatite Fission Track ◽

Mountain Area ◽

Thermal Event ◽

Fission Track Ages ◽

Apatite Fission Track Dating

Apatite fission-track ages for weakly altered rocks from the Syenite Range and Burwash Landing area of the Yukon Territory, and Cassiar area of British Columbia are shown to be consistent and generally concordant with K–Ar ages obtained on biotite from the same samples. More intensely altered rocks from Granisle Mine and the Copper Mountain area of British Columbia have discordant ages, due in part to alteration of apatite grains and, for samples from the Copper Mountain intrusions, to a Cretaceous (?) thermal event.

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