[meteorite-list] It's a 'hole' lotta fun ("Cooradigbee crater")
From: Paul H. <oxytropidoceras_at_meteoritecentral.com>
Date: Sun, 23 Sep 2012 10:20:30 -0500 Message-ID: <20120923112030.CUG3M.2120721.imail_at_eastrmwml301> In "It's a 'hole' lotta fun" at: http://six.pairlist.net/pipermail/meteorite-list/2012-September/087340.html Tom Randall wrote ?Cooradigbee crater? Anyone have any more info on this? http://bit.ly/NHLhWu ? The article is It's a 'hole' lotta fun? by Tim the Yowie Man, Travel Section, The Age at http://www.theage.com.au/travel/blogs/yowie-man/its-a-hole-lotta-fun-20120921-26cnh.html There is a picture of the alleged crater at: http://images.theage.com.au/2012/09/21/3654727/art353-yowie3-300x0.jpg Given the small size of it and the indefinite location it is hard to tell much about from a literature review and without going there. Judging from the lack of any well defined rim and any reported evidence other than tilted rocks, it does not look at all promising. Still, any definitive conclusion would have to come from an onsite inspection by a professional or avocational geologist. The video does claim that rocks being ?45 degrees to the west? in one place and being ?45 degrees to the east? in another part of the area as evidence of an impact. The Brindabella 1:100 000 Geological Map (Owen and Wyborn 1979), Canberra 1:250,000 scale geologic map (Gilligan 1974), Goulburn 1:250 000 Geological Map (Johnson et al. 2010), and the Yass 1:100 000 Geological Map (Colquhoun 2008), demonstrate that the area of Lake Burrinjuck, New South Wales within which the Cooradigbee Homestead (and ?Cooradigbee Crater?) occurs consist of tightly folded, faulted, and otherwise deformed Early Devonian volcanic, volcanoclastic, and terrigeneous sedimentary rocks. There is also a thick layer of folded and faulted ?massive to thin-bedded fossiliferous limestone and calcareous shale? in the area of Wee Jasper. As a result, a person will need more than tilted strata to argue for the existence of a impact crater. Also, depending on the location of this shallow topographic bowl, a person might have to exclude the possibility it is a sinkhole. For Google Earth fans, the location of the Cooradigbee Homestead is 35 degrees, 3?, 49.73?S, and 148 degrees, 39?, 37.61? E. Reference cited Colquhoun G. P., A. Y. E. Warren, R. G. Cameron, A. J. Johnston, and D. J. Pogson, 2008, Yass 1:100 000 Geological Sheet 8628, 2nd edition. Geological Survey of New South Wales, Sydney. http://www.resources.nsw.gov.au/geological/geological-maps/1-100-000/yass-1100-000-geological-map http://www.resources.nsw.gov.au/geological/geological-maps/1-100-000#central Gilligan, L. B., 1974, Canberra 1:250,000 Metallogenic Map. Geological Survey of New South Wales, SI/55-16, Sydney, Australia. http://www.resources.nsw.gov.au/geological/mineral-maps-data/1-250-000/canberra-1250-000-metallogenic-map http://www.resources.nsw.gov.au/geological/mineral-maps-data/1-250-000 Johnston, A. J., M. M. Scott, O. D. Thomas, D. J. Pogson, A. Y. E. Warren, L. Sherwin, G. P. Colquhoun, J .J. Watkins, R. G. Cameron, G. P. Macrae and R. A. Glen., 2010, Goulburn 1:250 000 Geological Sheet SI/55-12, Provisional 2nd edition, Geological Survey of New South Wales, Maitland. http://www.resources.nsw.gov.au/geological/geological-maps/1-250-001/goulburn-250k-geological-map http://www.resources.nsw.gov.au/geological/geological-maps/1-250-001 Owen, M. and D. Wyborn, 1979, Brindabella (NSW and ACT) 1:100 000 Geological Map First Edition, BMR, Canberra http://www.resources.nsw.gov.au/geological/geological-maps/1-100-000/brindabella-1100-000-geological-map http://www.resources.nsw.gov.au/geological/geological-maps/1-100-000#central For other Australian geological maps go to: Scanned 1:250 000 Geology Maps of Australia http://tinyurl.com/GeologicalMapsAustralia http://www.geoscience.gov.au/index.html Best wishes, Paul H. Received on Sun 23 Sep 2012 11:20:30 AM PDT |
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