Diagenesis and Depositional Environment of Pre-Harrogate Devonian, British Columbia: ABSTRACT

AAPG Bulletin ◽  
1964 ◽  
Vol 48 ◽  
Author(s):  
H. R. Belyea
Keyword(s):  
British Columbia ◽  
Depositional Environment

scholarly journals An Upper Jurassic ichthyosaur (Ichthyosauria: Ophthalmosauridae) from the Bowser Basin, British Columbia

2016 ◽  
Vol 53 (1) ◽  
pp. 34-40
Author(s):  
Robin L. Sissons ◽  
Michael W. Caldwell ◽  
Carol A. Evenchick ◽  
Donald B. Brinkman ◽  
Matthew J. Vavrek
Keyword(s):  
British Columbia ◽  
Body Size ◽  
Late Jurassic ◽  
Body Shape ◽  
Depositional Environment ◽  
Upper Jurassic ◽  
Generic Level ◽  
Shallow Marine ◽  
Northwestern North America ◽  
High Diversity

Although the Jurassic was a period of high diversity in ichthyosaurs, only a small number of specimens have been recorded from Canada to date. We describe here a new occurrence of an ophthalmosaurid ichthyosaur from a shallow marine depositional environment within the Bowser Basin of northern British Columbia. Based on vertebral diameters and the size of the humerus, the ichthyosaur was relatively large compared to other contemporaneous forms, yet possessed teeth that were small for its body size. As well, the height to length ratio of the preserved vertebrae suggests it may have had a more elongate, less regionalized body shape. Although indeterminate at a generic level, the presence of Late Jurassic ichthyosaurs in nearshore waters of northwestern North America further demonstrates their cosmopolitan distribution.

Debris avalanche impoundments of Squamish River, Mount Cayley area, southwestern British Columbia

1991 ◽  
Vol 28 (9) ◽  
pp. 1375-1385 ◽  
Author(s):  
Gregory R. Brooks ◽  
Edward J. Hickin
Keyword(s):  
British Columbia ◽  
Depositional Environment ◽  
Debris Avalanche ◽  
Low Energy ◽  
Fluvial Deposits ◽  
Debris Avalanches ◽  
Lower Terrace ◽  
Terrace Deposit

Squamish River has been impounded temporarily by debris avalanches from Mount Cayley on numerous occasions. Evidence of these impoundments comes from backwater deposits and also from a cluster of in situ stumps protruding from a bar along Squamish River. Backwater deposits consist of both lacustrine and fluvial deposits that have formed within the low-energy depositional environment created by a river impoundment. Three main backwater deposits occur in the study area. The fan toe deposit is ~14 m thick and represents a single impoundment of Squamish River that likely formed behind a large ~4800 BP debris avalanche. In situ ~3200 BP stumps along Squamish River probably were killed by a river impoundment due to a debris avalanche. The upper terrace backwater deposit is ~6 m thick and forms an aggradational terrace along Squamish River which probably accumulated behind an ~1100 BP debris avalanche. The lower terrace deposit also forms an aggradational terrace along Squamish River but represents four or possibly five separate impoundments. These occurred between ~1100 BP and 1955 AD, and it seems likely that one of the deposits relates to an ~500 BP debris avalanche. Seven or eight Holocene impoundments of Squamish River have been identified in the study area.

scholarly journals Holocene Paleohydrology of the St. Elias Mountains, British Columbia and Yukon

2007 ◽  
Vol 40 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Peter G. Johnson
Keyword(s):  
British Columbia ◽  
Sediment Transport ◽  
Depositional Environment ◽  
Temporal Changes ◽  
The Holocene ◽  
Lake Formation ◽  
Valley Side ◽  
Dammed Lake ◽  
Fluctuation Model ◽  
Talus Deposits

ABSTRACT The evolution of the Holocene paraglacial environment of the St. Elias Mountains has been dominated by hydrological variations which modify the direct glacial depositional environment and trigger instabilities in valley side glacial and talus deposits. Data from the Kaskawulsh Glacier demonstrate how discharge and sediment transport regimes vary through the season, as sediment is flushed out of the system, and a marginal to subglacial drainage change of the Grizzly Creek Glacier illustrates the effects of extraordinary events in transporting large volumes of sediment. A multiple glacier fluctuation model applied to the region produces rapid temporal changes in discharge and sediment regimes throughout the Holocene. The effect of these variations is enhanced by the occurrence of surges of many of the glaciers of the St. Elias Mountains and by sequences of glacier dammed lake formation and drainage in the region.

Biostratigraphic constraints and depositional environment of theLower Cretaceous (Albian) Boulder Creek Formation, Monkman area, northeastern British Columbia

1990 ◽  
Vol 27 (3) ◽  
pp. 452-458 ◽  
Author(s):  
C. R. Stelck ◽  
Dale A. Leckie
Keyword(s):  
British Columbia ◽  
Depositional Environment ◽  
Middle Portion ◽  
Full Core

A full core through the Boulder Creek Formation in the Monkman area of northeastern British Columbia yielded foraminifera from the overlying Hasler Formation and underlying Hulcross Formation, thereby constraining the age of the Boulder Creek Formation from mid middle Albian to mid late Albian. Shales of the Hulcross Formation carry the microfauna of the Haplophragmoides multiplum Subzone of the Gaudryina nanushukensis Zone. Cored shales of the Hasler Formation immediately overlying the Boulder Creek Formation carry the microfauna of the Trochammina depressa Subzone of the Haplophragmoides gigas Zone. The presence of 15 fossil soils within the middle portion of the Boulder Creek Formation records multiple depositional hiatuses within the formation in the Monkman area.

Paleoecology of Eocene lacustrine varves at Horsefly, British Columbia

1977 ◽  
Vol 14 (5) ◽  
pp. 953-962 ◽  
Author(s):  
M. V. H. Wilson
Keyword(s):  
British Columbia ◽  
Depositional Environment ◽  
Middle Eocene ◽  
Lacustrine Sediments ◽  
Late Summer ◽  
Coarse Grained ◽  
Temperate Climate ◽  
Fish Scales ◽  
Plant Remains ◽  
Warm Temperate

Middle Eocene lacustrine sediments, cropping out in the valley of the Horsefly River, British Columbia, contain abundant fossils of fishes, fish scales, fish coprolites, insects, leaves, and diatoms. The fish scales, insects, and leaves are preserved in at least three sequences of alternating light tuff and dark sapropel laminae, separated stratigraphically by coarse-grained structureless sequences. The proportions of the main types of fossils occurring in the light laminae compared with the dark laminae are significantly different, and are consistent with the hypothesis that the laminations are varves, with dark organic winter laminae and light inorganic summer laminae. Occasional graded sandy layers contain carbonized allochthonous plant remains and represent turbidity deposits caused by storms in the drainage basin.It is proposed here that the varves were deposited in the deeper regions of a stratified, monomictic or meromictic lake in a warm temperate climate. The depositional environment was anaerobic, containing abundant hydrogen sulphide, and was free of turbulence and benthos. Fish were entombed mostly during the winter, insects during the spring and summer, coprolites during the summer, and deciduous leaves during the late summer and autumn. The fish died of starvation and (or) overturn-induced anoxia.

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