000 02946nam  2200349za 4500
0019.833564
003CaOODSP
00520230131161137
007cr |||||||||||
008170308s1999    oncab   ob   f000 0 eng d
040 |aCaOODSP|beng
043 |an-cn-on|an-cn-qu
0861 |aM183-2/3708E-PDF
1001 |aVeillette, Jean.
24514|aThe enigmatic rings of the James Bay Lowland |h[electronic resource] : |ba probable geological origin / |cJ.J. Veillette, J-F. Giroux.
260 |a[Ottawa] : |bNatural Resources Canada, |c1999.
300 |a28, [11] p. : |bill., maps
4901 |aOpen file ; |v3708
500 |aHistorical publication digitized by the Geological Survey of Canada.
500 |a"1999."
500 |aAuthors' affiliation: Terrain Sciences Division, Geological Survey of Canada; Département des sciences biologiques, Université du Québec a Montréal.
504 |aIncludes bibliographical references (p. 21).
5203 |a"Light-coloured circular rings typically <300 m but up to 2 km in diameter, are clearly visible on airphotos, in poorly-drained stands of black spruce (Picea mariana) in the boreal forest of northwestem Quebec and northern Ontario, as well as on Anticosti Island in the Gulf of Saint Lawrence. The features have long been object of curiosity and speculation. Their origin remains unknown and has intrigued vegetation and earth science specialists since aerial photographs became a common surveying tool. The features have been noted by geologists, some of whom mapped them using a symbol proportional to their actual size. But generally the rings were ignored or not detected by surficial mappers and foresters. We present here the first systematic inventory of the features in an attempt to focus the attention of the geobotanical and geoscience communities on their potential scientific and economic importance. This progress report traces the evolution of research completed toward the objective of determining the origin of the rings, considered by some to be the result of biological and by others, of geological processes. We favour a geolocial/geochemical origin on the basis of the strong negative evidence gathered with respect to biological causes and the positive evidence for geological processes described in this report. Current investigations being carried out in cooperation with the Ontario Geological Survey and the private sector, are directed at a detailed analysis of individual rings"--Intro., p. 3.
69207|2gccst|aPlants
69207|2gccst|aSoil
69207|2gccst|aGeology
69207|2gccst|aGeochemistry
7001 |aGiroux, Jean-François,|d1975-
7101 |aCanada. |bNatural Resources Canada.
7102 |aGeological Survey of Canada.
830#0|aOpen file (Geological Survey of Canada)|v3708|w(CaOODSP)9.506878
85640|qPDF|s20.19 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M183-2/M183-2-3708-eng.pdf