00000nam 2200000zi 4500 9.917243 CaOODSP 20251031142448 m o d f cr mn||||||||| 221114t20222022oncab ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-on M183-2/8851E-PDF Brooks, Gregory Robert, 1958- author. Thickness record of varves from glacial Ojibway Lake recovered in sediment cores from Frederick House Lake, northeastern Ontario / G.R. Brooks. [Ottawa] : Geological Survey of Canada, 2022. ©2022 1 online resource (18 pages) : illustrations (some colour), maps (some colour) + radiograph images (1 page). text txt rdacontent computer c rdamedia online resource cr rdacarrier Open file, 2816-7155 ; 8851 Includes bibliographical references (pages 16-18). "The thicknesses of 384 rhythmic couplets were measured along a composite sequence of glacial Lake Ojibway glaciolacustrine deposits recovered in two sediment cores from Frederick House Lake, Ontario. The visual comparison of distinctive couplets in the CT-scan radiographs of the Frederick House core samples to photographs of core samples from Reid Lake show a match of ±1 varve number from v1656-v1902, and ±5 varve numbers between v1903-v2010, relative to the regional numbering of the Timiskaming varve series. There are two interpretations for the post-v2010 couplets that fall within the Connaught varve sequence of the regional series. In the first, the interpreted numbering spans from v2066-v2115, which produces a gap of 55 missing varves equivalent to v2011-v2065, and corresponds to the original interpretation of the Connaught varve numbering. The second spans v2011a-v2060a, and represents alternative (a) numbering for the same varves. Varve thickness data are listed in spreadsheet files (.xlsx and .csv formats), and CT-Scan radiograph images of core samples are laid out on a mosaic poster showing the interpreted varve numbering and between-core sample correlations of the varve couplets"--Abstract, page 1. Varves Ontario. Lake sediments Ontario. Glacial lakes Ontario. Varves Ontario. Sédiments lacustres Ontario. Lacs glaciaires Ontario. Geological Survey of Canada, issuing body. Open file (Geological Survey of Canada) 8851. (CaOODSP)9.506878 PDF 17.76 MB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8851-eng.pdf (report) PDF 18.87 MB https://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8851-1-eng.pdf (Radiograph images of the Frederick House Lake cores) HTML N/A https://doi.org/10.4095/329275 (complete dataset)