00000nam 2200000za 4500 9.821654 CaOODSP 20251031142447 cr ||||||||||| 160726s2011 onc|||||o f|0| 0 eng d CaOODSP eng n-cn--- M183-2/6822E-PDF Evidence for an important tectonostratigraphic seismic marker across Canada Basin and southern Alpha Ridge of the Arctic Ocean [electronic resource] / J.W Shimeld ... [et al.]. [Ottawa] : Natural Resources Canada, Geological Survey of Canada, 2011. 1 poster : photos, graphs, maps. Open file (Geological Survey of Canada) 6822 Includes bibliographical references. An extensive modern dataset of short-offset seismic reflection profiles coupled with wide-angle reflection and refraction sonobuoy records enable new insights into the crustal types, rifting processes, subsidence history, and sedimentary sequences of Canada Basin, Northwind Ridge, and southern Alpha Ridge. Exceeding 6.5 km in thickness across southern Canada Basin and thinning northward to Alpha Ridge, the sedimentary succession is divided into more than a dozen regional seismostratigraphic units, the oldest of which is informally named the bisque unit. Characterized by anomalously high-amplitude reflections, this unit is of interest since it immediately overlies acoustic basement and may indicate something about the nature of basement and its tectonic history. ... gccst Geophysics gccst Sediments gccst Stratigraphy Seismic reflection Tectonic history Crustal studies Marine geology Shimeld, John W. (John William), 1968- Canada. Natural Resources Canada. Geological Survey of Canada. Open file (Geological Survey of Canada) 6822 (CaOODSP)9.506878 PDF 23.72 MB https://publications.gc.ca/collections/collection_2016/rncan-nrcan/M183-2-6822-eng.pdf doi:10.4095/289234