Potassium–argon ages of dolerite plugs in the South Cariboo region, British Columbia

1969 ◽  
Vol 6 (6) ◽  
pp. 1468-1470 ◽  
Author(s):  
R. B. Farquharson ◽  
J. J. Stipp
Keyword(s):  
British Columbia ◽  
The South ◽  
South Central ◽  
Late Tertiary

Potassium–argon dates for late Tertiary dolerite plugs in south-central British Columbia indicate that a period of volcanism occurred in mid-Pliocene time.

Des oolites volcaniques dans le massif du Mont-Dore

1964 ◽  
Vol S7-VI (3) ◽  
pp. 402-411
Author(s):  
Robert Brousse
Keyword(s):  
Aqueous Environment ◽  
The South ◽  
South Central ◽  
Great Height ◽  
Late Tertiary ◽  
Pumice Flow

Abstract A bed of late Tertiary volcanic oolitic concretions occurs at the top of a pumice flow intercalated between two basalt flows in the south flank of the Mont Dore volcanic massif of south-central France. The oolites are ellipsoidal to pear-shaped and have a mean density of only 0.11 as contrasted with 0.5 for pumice. The cores are aggregates of pumice, glass, feldspar, and augite fragments with five to ten concentric shells of the same materials. The oolites are not of aqueous environment. Their positions in the bed indicate they were air-borne and some are radially cracked from impact. The original shattered materials were thrown to great height by a violent eruption, and the oolites were formed by progressive aggregation of the fine fragments in falling back to earth in a manner analogous to the formation of hail.

Relationships between deer mice and downed wood in managed forests of southern British Columbia

2006 ◽  
Vol 36 (9) ◽  
pp. 2189-2203 ◽  
Author(s):  
Vanessa J Craig ◽  
Walt Klenner ◽  
Michael C Feller ◽  
Thomas P Sullivan
Keyword(s):  
British Columbia ◽  
Population Dynamics ◽  
Vegetation Cover ◽  
High Elevation ◽  
Deer Mice ◽  
The South ◽  
Clear Cut ◽  
South Central ◽  
High Elevation Site ◽  
Downed Wood

We examined the relationship between deer mice (Peromyscus maniculatus (Wagner)) and downed wood in a low-elevation Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest and a high-elevation Engelmann spruce (Picea engelmannii Parry ex Engelm.) – subalpine fir (Abies lasiocarpa (Hook.) Nutt.) forest in the south-central interior of British Columbia. We experimentally manipulated the volume of downed wood on clear-cut and forested sites and monitored the response of deer mice with a mark–recapture study to assess population densities and survival and reproduction rates. Populations responded positively to harvesting at the low-elevation but not the high-elevation study area. At the low-elevation study area, the population dynamics of deer mice on clear-cut and forested treatments were not positively associated with patterns of vegetation cover or increasing downed-wood volumes. Instead, populations on clearcuts appeared to increase in response to an unknown factor associated with lower volumes. No relationship was detected between population dynamics of deer mice and downed-wood volumes at the high-elevation site. The population dynamics of deer mice on forests at the high-elevation site appeared to be more closely related to vegetation cover than to downed wood. The results indicated that downed wood is not a critical habitat component for deer mice in the south-central interior of British Columbia.

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