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TitleProposals for time classification and correlation of precambrian rocks and events in Canada and adjacent areas of the Canadian Shield, part 2: a provisional standard for correlating precambrian rocks
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDouglas, R J W
SourceGeological Survey of Canada, Paper no. 80-24, 1980, 19 pages (1 sheet), https://doi.org/10.4095/111343 (Open Access)
Year1980
PublisherGeological Survey of Canada
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Subjectsgeochronology; correlations; time; Canadian Shield; Precambrian
Released1981 03 01; 2016 03 11
AbstractIn 1964 the Geological Survey published a Precambrian time scale based on isotopic age determinations which quantified and somewhat elaborated the then existing fourfold division. The Survey is currently compiling a 64-sheet, 1:1 million Geological Atlas and this has emphasized the need for a revised standard of Precambrian time to enable correlation between different map areas and to describe more clearly geological relationships . In this report modifications are proposed to the 1964 standard, "type" assemblages are designated and the possible use of magneto-chronological units is examined. The units are described in order of increasing age in terms of Magnetic Intervals and isotopic age. It is proposed that the Archean be divided into three eras and that the youngest of these be divided into two suberas. It is further proposed that the Aphebian be divided into three suberas, that the Neohelikian be divided into three suberas, that the Paleohelikian also be divided into three and that the Hadrynian be divided into two suberas. New names are proposed for some of these divisions.
GEOSCAN ID111343