Cenozoic ichthyolith biostratigraphy: Tofino Basin, British Columbia

2006 ◽  
Vol 43 (2) ◽  
pp. 177-204 ◽  
Author(s):  
Marjorie J Johns ◽  
Christopher R Barnes ◽  
Y Roshni Narayan
Keyword(s):  
British Columbia ◽  
Vancouver Island ◽  
Late Eocene ◽  
Pacific Rim ◽  
Accretionary Complex ◽  
Crescent Formation ◽  
The Pacific ◽  
Tectonically Active ◽  
Multiple Data Sets ◽  
Fossil Preservation

Five new late Eocene – Pliocene ichthyolith zones are defined based on indigenous faunal occurrences in strata that outcrop along western Vancouver Island and samples from six offshore Tofino Basin wells. Five new interval zones are each defined based on distinct transported ichthyolith assemblages. Results are correlated within the framework of established Cenozoic west coast and Arctic foraminifer zones and ichthyolith occurrences in deep-sea core samples and Cretaceous Queen Charlotte Group and Nanaimo Group strata of coastal British Columbia. The use of multiple data sets was important to interpret complex active tectonic margin sedimentation and structures. The integrated ichthyolith and foraminifer biostratigraphy allowed an interpretation of well log data and lithology reports. Also, we reassessed previous offshore seismic data, evaluated fossil preservation and thermal alteration, and distinguished transported from indigenous ichthyolith occurrences. These data allowed a reinterpretation of tectonic segments and associated strata of the Pacific Rim and Crescent terranes and the Cascadia Accretionary Complex onshore and offshore Vancouver Island. Tectonically active phases during the Eocene and Oligocene – early Miocene resulted in transport of Cretaceous to Eocene ichthyoliths from structural highs to lows, indicating proximity of the Pluto I-87 and Zeus D-14 wells to the Tofino Fault between the Pacific Rim and Crescent terranes and suggesting derivation with coeval Hesquiat Peninsula strata. An unconformity above the Eocene Crescent Formation volcanics in Prometheus H-68 and Zeus D-14 wells is correlated with the Pluto I-87 and Apollo J-14 well stratigraphy. An upper Miocene unconformable surface coincides with accretion and uplift of the Cascadia Accretionary Complex.

Integrated geophysical modelling of terranes and other structural features along the western Canadian margin

1992 ◽  
Vol 29 (7) ◽  
pp. 1492-1508 ◽  
Author(s):  
S. A. Dehler ◽  
R. M. Clowes
Keyword(s):  
Seismic Refraction ◽  
Vancouver Island ◽  
Structural Features ◽  
Pacific Rim ◽  
Data Set ◽  
Reflection Seismic ◽  
Barkley Sound ◽  
The Pacific ◽  
Wrangellia Terrane ◽  
Lower Crustal

An integrated geophysical data set has been used to develop structural models across the continental margin west of Vancouver Island, Canada. A modern accretionary complex underlies the continental slope and shelf and rests against and below the allochthonous Crescent and Pacific Rim terranes. These terranes in turn abut against the pre-Tertiary Wrangellia terrane that constitutes most of the island. Gravity and magnetic anomaly data, constrained by seismic reflection, seismic refraction, and other data, were interpreted to determine the offshore positions of these terranes and related features. Iterative 2.5-dimensional forward models of anomaly profiles were stepped laterally along the margin to extend areal coverage over a 70 km wide swath oriented normal to the tectonic features. An average model was then developed to represent this part of the margin. The Pacific Rim terrane appears to be continuous and close to the coastline along the length of Vancouver Island, consistent with emplacement by strike-slip motion along the margin. The Westcoast fault, the boundary between the Pacific Rim and Wrangellia terranes, is interpreted to be 15 km farther seaward than in previous interpretations in the region of Barkley Sound. The Crescent terrane forms a thin landward-dipping slab along the southern half of the Vancouver Island margin, and cannot be confirmed along the northern part. Model results suggest the slab has buckled into an anticline beneath southern Vancouver Island and Juan de Fuca Strait, uplifting high-density lower crustal or upper mantle material close to the surface to produce the observed intense positive gravity anomaly. This geometry is consistent with emplacement of the Crescent terrane by oblique subduction.

A New Species of Bradyidius (Copepoda: Calanoida) from the Pacific Coast of North America

1966 ◽  
Vol 23 (6) ◽  
pp. 805-811 ◽  
Author(s):  
Tai Soo Park
Keyword(s):  
British Columbia ◽  
New Species ◽  
North America ◽  
Pacific Coast ◽  
Vancouver Island ◽  
Saanich Inlet ◽  
The Pacific ◽  
A New Species

A new species Bradyidius saanichi from Saanich Inlet, Vancouver Island, British Columbia, Canada, is described and illustrated in detail. This species is closely related to B. pacificus (Brodsky, 1950) among the six previously known species in the genus, but can be readily distinguished from the latter by the strongly divergent rostral rami in addition to some other differences.

Description of Mycale bamfieldense n.sp. (Porifera, Demospongiae, Poecilosclerida) from Vancouver Island, British Columbia

1989 ◽  
Vol 67 (3) ◽  
pp. 674-677 ◽  
Author(s):  
H. M. Reiswig ◽  
H. Kaiser
Keyword(s):  
British Columbia ◽  
New Species ◽  
Vancouver Island ◽  
Pacific Basin ◽  
Cytoplasmic Vacuoles ◽  
The Pacific ◽  
Sponge Spicules ◽  
A New Species ◽  
Outer Coast

A new species of Porifera, Mycale banfieldense (Demospongiae, Poecilosclerida), is described from a semiobscure, intertidal cavern of the outer coast of Vancouver Island, British Columbia, Canada. This is the first species of Mycale from the Pacific basin known to possess micracanthoxea microscleres, and only the second such species worldwide. These microscleres, which average 4.2 × 0.2 μm, are the smallest sponge spicules discovered to date. They are formed individually within cytoplasmic vacuoles of anucleolate scleroblasts but each scleroblast contains 20 to 50 similar spicules.

scholarly journals Magnetic anomaly map of the pacific ocean west and northwest of Vancouver island, British Columbia

1979 ◽  
Author(s):  
R G Currie ◽  
D A Seemann ◽  
D L Tiffin
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Magnetic Anomaly ◽  
Vancouver Island ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Anomaly Map

New Enchytraeidae (Oligochaeta) from the east coast of Vancouver Island

1969 ◽  
Vol 47 (3) ◽  
pp. 387-393 ◽  
Author(s):  
Michael J. Tynen
Keyword(s):  
British Columbia ◽  
New Species ◽  
North America ◽  
North American ◽  
East Coast ◽  
Vancouver Island ◽  
Northwest Pacific ◽  
The Pacific ◽  
Pacific Slope

The following new species of littoral enchytraeid are described from the east coast of Vancouver Island, British Columbia—Enchytraeus cryptosetosus, Lumbricillus mirabilis, L. vancouverensis, L. georgiensis, L. qualicumensis, L. belli. These descriptions bring the number of North American Enchytraeus spp. to 6 and that of Lumbricillus spp. to 13. Existing evidence suggests that the enchytraeid fauna of the Pacific slope is quite distinct from that of the rest of North America and may have closer affinities with that of the northwest Pacific.

Hydrographic Charting and Oceanography on the West Coast of Canada from the Eighteenth Century to the Present Day

1972 ◽  
Vol 73 ◽  
pp. 75-83
Author(s):  
Robert W. Sandilands
Keyword(s):  
British Columbia ◽  
Eighteenth Century ◽  
Pacific Northwest ◽  
West Coast ◽  
Vancouver Island ◽  
The West ◽  
Special Place ◽  
The Pacific ◽  
Short Period ◽  
Formative Years

Those participating in this Congress are aware of the leadership of Rear-Admiral George Henry Richards in mounting the Challenger Expedition, which he himself regarded as the crowning achievement of his career. However, he also has a very special place in the history and development of British Columbia and it can fairly be said that his work in the Pacific Northwest was the major achievement of his sea-going career. His service on the coast covered the short period 1857 to 1863, but these were formative years in the development of the west coast colonies of Vancouver Island and British Columbia.

scholarly journals Conservation Evaluation of the Pacific Population of Tall Woolly-heads, Psilocarphus elatior, an Endangered Herb in Canada

2004 ◽  
Vol 118 (2) ◽  
pp. 169
Author(s):  
George W. Douglas ◽  
Jeanne M. Illingworth
Keyword(s):  
British Columbia ◽  
Vernal Pools ◽  
Vancouver Island ◽  
Pacific Population ◽  
Large Numbers ◽  
The Pacific ◽  
The Status ◽  
Conservation Evaluation

In Canada, Psilocarphus elatior occurs in British Columbia, Alberta and Saskatchewan. This paper examines the status of the Pacific populations located on southeastern Vancouver Island in southwestern British Columbia. The Pacific population consists of 12 recorded sites of which only five have been confirmed since 1993. In British Columbia, P. elatior is associated with dried beds of vernal pools and other open, moist depressions at lower elevations. In British Columbia, P. elatior populations occur in large numbers at only two of the seven locations.

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