Secular variation of the Earth's magnetic field from 18.5 to 15.0 ka BP, as recorded in a Vancouver Island stalagmite

1987 ◽  
Vol 24 (6) ◽  
pp. 1235-1241 ◽  
Author(s):  
A. G. Latham ◽  
H. P. Schwarcz ◽  
D. C. Ford
Keyword(s):  
Magnetic Field ◽  
British Columbia ◽  
North America ◽  
Secular Variation ◽  
North American ◽  
Vancouver Island ◽  
American Continent ◽  
The West ◽  
Type Curve ◽  
North American Continent

A record of secular variation has been obtained from a stalagmite from Vancouver Island, British Columbia, Canada, covering the period 18.5–15.0 ka BP. The ages, obtained by the U–Th method, were not fully constrained because of the low U content of the sample. The record contributes to a regional type curve obtained from the sediments of Bessette Creek (31–19 ka BP), and to which it shows similar features. In particular, a 1600 year long signal of easterly bias and shallow inclinations is similar to three earlier such features, attributed by M. E. Evans to oscillating geomagnetic sources to the west of North America. The later part of the composite record correlates fairly well with other western North American lake records. There is no evidence for a geomagnetic excursion during this period for the western North American continent.

RECORDS OF SOME SPECIES OF POLYCHAETA NEW TO BRITISH COLUMBIA AND OF EXTENSIONS IN DISTRIBUTION OF SOME OTHERS

1966 ◽  
Vol 44 (5) ◽  
pp. 839-849 ◽  
Author(s):  
C. Berkeley
Keyword(s):  
British Columbia ◽  
North America ◽  
West Coast ◽  
Vancouver Island ◽  
The Other ◽  
The West ◽  
New Subspecies ◽  
Northeast Pacific ◽  
Considerable Depth ◽  
Geographical Locations

Twenty-five species of Polychaeta recently collected off the coast of British Columbia are discussed. Most were taken in waters of considerable depth off the west coast of Vancouver Island. Sixteen are new to British Columbia. Most of these are known from farther south on the west coast of North America, but some from much shallower depths than those from which they are now recorded; two of them are new to the northeast Pacific; one is a new subspecies. The other nine have been previously known from British Columbia, but they are now recorded from much greater depths than hitherto, or in new geographical locations.

The species of Thecaphora on Compositae in North America

1982 ◽  
Vol 60 (8) ◽  
pp. 1512-1522 ◽  
Author(s):  
Rubén Durán
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
Morphological Characteristics ◽  
American Continent ◽  
Bright Field ◽  
New Host ◽  
North American Continent ◽  
The North ◽  
Scanning Electron

Five new species of Thecaphora collected in Mexico are described, some of which are parasitic on genera of Compositae not previously reported as hosts. Species of Thecaphora on Compositae for the North American continent now total 11. New species include Thecaphora denticulata, T. heliopsidis, T. hennenea, T. melampodii, and T. neo-mexicana. New host genera for North America include Bidens, Heliopsis, and Melampodium. Morphological characteristics of Thecaphora species and taxonomic criteria to delimit them are discussed. Keys to the species, interpretations of spore ball morphology and spore sculpturing, and scanning electron and bright-field micrographs are presented.

William Burke and Guadeloupe

2019 ◽  
pp. 27-46
Author(s):  
P. J. Marshall
Keyword(s):  
North American ◽  
West Indies ◽  
Benjamin Franklin ◽  
French Population ◽  
American Continent ◽  
The West ◽  
North American Continent ◽  
The North ◽  
British Colony ◽  
The Caribbean

William Burke gained the very desirable office of Secretary in the new regime established in the French island of Guadeloupe after the British conquest of 1758. The autonomy guaranteed to the French population under the terms of Guadeloupe’s surrender, however, limited the pecuniary advantages which he could obtain there. For much of his tenure he was in Britain, where he orchestrated a vigorous campaign for Guadeloupe to be turned into a permanent British colony. In his pamphlets, William, assisted by Edmund, argued cogently for greater value to be attached to gains in the Caribbean than to territorial aggrandizement on the North American continent. He was opposed by Benjamin Franklin among others. Whatever their merits, William’s arguments could not overturn long-established strategic priorities, in which new acquisitions in the West Indies did not feature highly. Guadeloupe went back to France in 1763 and William lost his office.

Evidence for the Emergence of the Hercynian Front on the North American Continent

1975 ◽  
Vol 12 (8) ◽  
pp. 1474-1479 ◽  
Author(s):  
Norman Z. Cherkis ◽  
Henry S. Fleming ◽  
James V. Massingill ◽  
Robert H. Feden
Keyword(s):  
Continental Margin ◽  
North American ◽  
Fracture Zone ◽  
Magnetic Measurements ◽  
American Continent ◽  
The West ◽  
North American Continent ◽  
The North ◽  
Mid Atlantic Ridge ◽  
Marine Seismic

Recent marine seismic reflection, bathymetric and magnetic measurements made across the Charlie Gibbs Fracture Zone have clearly shown that the fracture zone extends to the east of 17 °west longitude. Projections to the west of the Mid-Atlantic Ridge extend the fracture zone to the North American Continental margin northeast of Newfoundland. Projection of the structural trends of the Hercynian Front from the European continental margin offer a remarkable linearity with the Charlie Gibbs Fracture Zone on the west. Remnants of the Hercynian Front have been identified in New Brunswick. Flemish Cap, which foundered during the initial phase of the latest opening of the Atlantic is believed to have been located on the fracture zone's southern edge, before drifting southeasterly to its present position. The alignment of the Hercynian Front with the Charlie Gibbs Fracture Zone is linked up on the North American continent and is offered as a possible clue to the pre-drift configuration of the Laurasian continent.

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.

scholarly journals THE EFFECT OF THE GLACIAL EPOCH UPON THE DISTRIBUTION OF INSECTS IN NORTH AMERICA

1875 ◽  
Vol 7 (9) ◽  
pp. 164-167
Author(s):  
Aug. R. Grote
Keyword(s):  
United States ◽  
North America ◽  
North American ◽  
The United States ◽  
American Continent ◽  
North American Continent ◽  
The North ◽  
Glacial Epoch

From the condition of an hypothesis the glacial epoch has been elevated into that of a theory by the explanations it has afforded to a certain class of geological phenomena. The present paper endeavors to show that certain zoological facts are consistent with the presence, during past times, of a vast progressive field of ice, which, in its movement from north to south, gradually extended over large portions of the North American continent. These facts, in the present instance, are furnished by a study of our Lepidoptera, or certain kinds of butterflies and moths now inhabiting the United States and adjacent territories.

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