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TitleA probable meteorite crater of Precambrian age at Holleford, Ontario
AuthorBeals, C S
SourcePublications of the Dominion Observatory vol. 24, no. 6, 1960, 26 pages; 2 air photos,
PublisherCanada Department of Mines and Technical Surveys (Ottawa, Canada)
Mediapaper; photograph; on-line; digital
File formatpdf
Subjectsgeophysics; regional geology; structural geology; meteorite craters; densities; gravity interpretations; magnetic interpretations; sedimentary basins; seismic surveys; gravity surveys, ground; Holleford Crater; New Quebec Crater; Phanerozoic; Paleozoic; Ordovician; Precambrian
Released1960 01 01; 2018 11 19
AbstractA circular feature 1.46 miles in diameter and 100 feet deep located at longitude 76° 38' W and latitude 44° 27' N in southeastem Ontario has been investigated as a possible meteorite crater. Stereoscopic studies of aerial photographe in conjunction with geological and geophysical investigations indicated the presence of a circular depression in Precambrian rock filled in and covered over by Palaeozoic sediments. Three diamond drill holes at distances of 1,400 feet, 2,500 feet and 3,750 feet from the centre were eunk to see whether the depth below the sediments and the euh-surface structure were consistent with a meteoritic origin. The results showed a depth and profile close to those predicted for a meteorite crater of the observed diameter. Below the sediments a thickness of several hundred feet of
shattered and pulverized rock was found for which no adequate explanation has yet been found except that of meteorite impact and explosion.