Stratigraphy, sedimentology, and regional correlation of the Horsethief Creek Group (Hadrynian, Late Precambrian) in the northern Purcell and Selkirk Mountains, British Columbia

1980 ◽  
Vol 17 (12) ◽  
pp. 1708-1724 ◽  
Author(s):  
T. P. Poulton ◽  
P. S. Simony
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Submarine Fan ◽  
Source Areas ◽  
Late Precambrian ◽  
Coarse Sediment ◽  
Regional Correlation ◽  
Selkirk Mountains ◽  
Igneous Activity ◽  
Thickness Variations

The Hadrynian Horsethief Creek Group in the northernmost Purcell Mountains and adjacent Selkirk Mountains is subdivisible regionally into grit, slate, carbonate, and upper clastic divisions in upward succession. The grit division represents a submarine fan assemblage and the slate division hemipelagic muds probably deposited in intermediate depths. The carbonate division comprises an interval of discontinuous lenses representing "bahamian" carbonate bank and off-bank assemblages, and the upper clastic division is a heterogeneous clastic wedge, which shows some evidence of northerly and westerly increasing depositional depths. Feldspathic quartz pebble conglomerate beds intercalated with the carbonates in both bank and off-bank facies indicate tectonic activation of granitic source areas like those from which similar rocks in the upper part of the Miette Group of the Rocky Mountains were derived.The upper part of the slate division, which can be differentiated in western localities as a distinct semipelite–amphibolite unit, and the upper clastic division each expand in thickness northwestward to dominate the Horsethief Creek outcrops in the Selkirk Mountains. These thickness variations, the increase of amphibolite northward in the semipelite–amphibolite unit, and the loss of grit beds northward in the slate division suggest deposition in a depocentre that received coarse sediment from southerly and easterly directions, and that became the site of mafic igneous activity.

Stratigraphy and deformational history of the Scrip Nappe, Monashee Mountains, British Columbia

1983 ◽  
Vol 20 (4) ◽  
pp. 639-650 ◽  
Author(s):  
Robert P. Raeside ◽  
Philip S. Simony
Keyword(s):  
British Columbia ◽  
Lower Limb ◽  
Rocky Mountains ◽  
Metamorphic Grade ◽  
Deformational History ◽  
Crenulation Cleavage ◽  
Deformation Phase ◽  
Nappe Complex ◽  
Selkirk Mountains ◽  
History Of

The Scrip Nappe, a large recumbent anticline that occupies the northern Selkirk and northern Monashee Mountains, has an inverted lower limb, some 50 km in length across strike, and comprises stratigraphic divisions of the Hadrynian Horsethief Creek Group, which can be traced southward with decreasing metamorphic grade through the Selkirk Mountains to the northern Purcell Mountains. The Scrip Nappe has a southwesterly vergence and it formed that way during the first folding phase of the Mesozoic Columbian Orogeny. Metamorphism no greater than biotite zone accompanied that first deformation. The nappe was subsequently refolded into tight northeast verging folds. Metamorphism rose to upper amphibolite facies late in the second deformation phase. After the metamorphic climax, northeast verging buckle folds and associated crenulation cleavage formed locally during a third folding episode. The entire nappe complex was then carried northeastward, on the Purcell thrust, over the folds and thrusts of the western Rocky Mountains.

Isotopic provenance of the lower Muskwa assemblage (Mesoproterozoic, Rocky Mountains, British Columbia): new clues to correlation and source areas

2001 ◽  
Vol 111 (1-4) ◽  
pp. 57-77 ◽  
Author(s):  
G.M Ross ◽  
M.E Villeneuve ◽  
R.J Theriault
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Source Areas

Timing of geological events in the circum-Pacific region

1977 ◽  
Vol 14 (4) ◽  
pp. 551-561 ◽  
Author(s):  
Tatsuro Matsumoto
Keyword(s):  
Evolutionary Development ◽  
Pacific Region ◽  
Late Mesozoic ◽  
Late Precambrian ◽  
Tectonic History ◽  
Regional Correlation ◽  
Minor Degree ◽  
Igneous Activity ◽  
Tectonic Movements ◽  
Pacific Area

Two aspects of the timing of geological events in the circum-Pacific area are treated here. First, the tectonic history is considered on the basis of regional correlation. The circum-Pacific belt has been mobile in various ways since the late Precambrian and orogeny proceeded poly-cyclically without showing stabilized termination in any cycle. A major evolutionary development with an adolescent stage in late Mesozoic times is recognized.Second, the timing of the late Mesozoic events is examined in more detail, using Japan as an example. Tectonic movements proceeded for long periods of time, with several intermittent impulses or stepwise accelerations of major or minor degree. Minor movements are compatible with the tectonic displacement at the time of earthquakes. Igneous activity, including emplacement of granitic bodies and some associated volcanism, was long-lasting, and episodic in space and time.

The Sphaeroceridae (Diptera) of the Queen Charlotte Islands, British Columbia

1991 ◽  
Vol 69 (2) ◽  
pp. 443-448 ◽  
Author(s):  
S. A. Marshall ◽  
Terry A. Wheeler
Keyword(s):  
British Columbia ◽  
North America ◽  
Rocky Mountains ◽  
Glacial Refugium ◽  
Coastal Forest ◽  
Coast Range ◽  
Postglacial Colonization ◽  
Source Areas ◽  
Queen Charlotte Islands ◽  
Parsimonious Explanation

Sphaeroceridae were collected in the Queen Charlotte Islands, British Columbia, in July 1988, and their distributional patterns were examined to test the hypothesis that the archipelago was the site of a Wisconsinan glacial refugium. A total of 27 species of Sphaeroceridae was identified. Ten of these species show widespread Holarctic distributions, four species are widespread across North America, seven species are restricted to North America west of the Rocky Mountains, three species are restricted to the coastal forest west of the Coast Range, and three species are supralittoral along the coast. There is no indication of endemism or relict distributions on the islands; the sphaerocerid fauna is similar to that found on the adjacent mainland. The most parsimonious explanation for the origin of the present sphaerocerid fauna of the archipelago is postglacial colonization from mainland North America. The sphaerocerid distribution pattern was compared with patterns for other Diptera and Coleoptera from the region. In general, the Sphaeroceridae corroborate the pattern seen in most other insect taxa, with postglacial dispersal from mainland source areas accounting for the present sphaerocerid fauna of the Queen Charlotte Islands.

Ediacaran fossils and dubiofossils, Miette Group of Mount Fitzwilliam area, British Columbia

1991 ◽  
Vol 28 (10) ◽  
pp. 1541-1552 ◽  
Author(s):  
H. J. Hofmann ◽  
E. W. Mountjoy ◽  
M. W. Teitz
Keyword(s):  
British Columbia ◽  
Shallow Water ◽  
Rocky Mountains ◽  
Carbonate Mounds ◽  
Windermere Supergroup

Shallow-water clastic beds flanking stromatolitic carbonate mounds in the upper part of the Vendian Miette Group (Windermere Supergroup) of the Rocky Mountains contain a poorly preserved, soft-bodied fauna that comprises morphologically very variable discoid remains; these include the taxa Beltanella sp., cf. B. grandis, Charniodiscus? sp., Irridinitus? sp., Nimbia occlusa, Protodipleurosoma sp., cf. P. rugulosum, and Zolotytsia? sp. and seven types of dubiofossils.

New Lower Jurassic ammonite faunas from the Fernie Formation, southern Canadian Rocky Mountains

1987 ◽  
Vol 24 (8) ◽  
pp. 1688-1704 ◽  
Author(s):  
Russell L. Hall
Keyword(s):  
British Columbia ◽  
North American ◽  
Rocky Mountains ◽  
Red Deer ◽  
First Record ◽  
Lower Jurassic ◽  
Canadian Rocky Mountains ◽  
Poker Chip

New ammonite faunas are described from sections along Bighorn and Scalp creeks in central-western Alberta where Lower Jurassic parts of the Fernie Formation are exposed. The first record of the upper Sinemurian Obtusum Zone from the Fernie is based on the occurrence of Asteroceras cf. stellare and Epophioceras cf. breoni in the basal pebbly coquina on Bighorn Creek. The overlying Red Deer Member has yielded Amaltheus cf. stokesi, representing the upper Pliensbachian Margaritatus Zone; in immediately superjacent strata the first North American examples of ?Amauroceras occur together with Protogrammoceras and ?Aveyroniceras. In the basal parts of the overlying Poker Chip Shale a fauna including Harpoceras cf. falciferum, Harpoceratoides, Polyplectus cf. subplanatus, Hildaites cf. serpentiniformis, and Dactylioceras cf. athleticum is correlated with the lower Toarcian Falciferum Zone.The upper parts of the Poker Chip Shale on Fording River in southeastern British Columbia contain a fauna representing some part of the upper Toarcian, but owing to poor preservation, generic identifications are only tentatively made.

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