MY AMATEUR ADVENTURES IN CRATER EXPLORATION
by: Charles O’Dale
- Crater URL List
- Craters Sorted
- 2021 Data Updates
- RASC 150 featuring the Manicouagan Crater;
The scientific study of impact structures began only about 50 years ago. I’m dating myself, but that was about the time my interest in impact craters started. Like any kid, I spent hours looking at the craters on the Moon through my old telescope. Would I ever get a chance to explore a crater?
You may think that the natural geological forces on our planet would have destroyed any features of impact craters. But, in some instances, these forces have “cross sectioned” the craters to ease our study. I have found the geology in these craters and structures fascinating!
While studying the physics of impact crater sites, I have found that circular geological features can also be produced by a number of geological processes.
Halliday I., and Griffin, A.A. 1964: Application of the scientific method to problems of crater recognition Meteoritics, vol. 2, No. 2.
These geological processes may include igneous activity (diatremes, maars, calderas, volcanoes, or syenite/plutons), dissolution and collapse of salt or carbonate rocks by groundwater (dolines), salt or shale diapirism, regional tectonism (circular fold-interference patterns or stratified circular features), glaciation (kettle holes), carbonate mounds, and by meteorite impacts (Stewart 2003).
Stewart S. A. 2003: How will we recognize buried impact craters in terrestrial sedimentary basins? Geology 31:929–932.
“Civilization exists by geological consent …. subject to change without notice.”
– W. Durant –
My science background plus the experience that I have gleaned from my past profession of semiconductor failure analysis has given me the incentive to document my analysis of these craters and structures. I encourage anyone to please contact me if they note any errors that I may have made in my documentation or if they have something to add.(A few of my expeditions actually resulted from suggestions made from readers of this site).
Younger Dryas Extinction Impact Related? (Bloody Creek @ 29:30).
“We, all of us, are what happens when a primordial mixture of hydrogen and helium evolves for so long that it begins to ask where it came from.”
“How bright and beautiful a comet is as it flies past our planet – provided it does fly past it” ISAAC ASIMOV “All things originate from one another and vanish into another … according to time” ~ANAXIMANDER
2. CRATER URL References
For the complete physics of impact crater formation I recommend the following references:
- VIDEO – CRATER EXPLORATIONS
- Air&Space SMITHSONIAN
- United States Meteorite Impact Craters
- Ernstson Claudin Impact Structures – Meteorite Craters
- Meteor/Meteorite News
- A CATASTROPHE OF COMETS
- The recognition of terrestrial impact structures,
- Large Meteorite Impacts and Planetary Evolution II,
- Traces of Catastrophe,
- Why Does The Moon Have Craters?
- Phil Plait: How to defend Earth from asteroids.
- B612 Foundation
3. CRATERS SORTED:
5. RASC 150
Components of the RASC Sesquicentennial Logo:
The aurora borealis is a quintessentially Canadian space-weather phenomenon, one shared with other high latitude cultures. RASC members have contributed to the scientific, historical, and artistic investigation of the northern lights, and have promoted their recreational enjoyment.
The Manicouagan astrobleme (214 ± 1 Ma) represents the major discovery of sites of impact cratering in the Canadian Shield, an effort pioneered by astrophysicists and geophysicists at the Dominion Observatory (ca. 1950-), many of whom were RASC members. This world-impacting research played a crucial role in changing scientific and popular perceptions of crater-forming mechanisms, solar-system history, and planetary geology. The representation of the crater also acknowledges Canadian excellence in meteor dynamics, meteorite petrology, meteorite curation, and the RASC’s long-standing interest in such work.
The stars represent the major Canadian contributions to stellar spectroscopy done at the Dominion Observatory, the Dominion Astrophysical Observatory (also see this), the David Dunlap Observatory,(additionally refer to this) and elsewhere (ca. 1905-), whose major contributors were also RASC members (such as J.S. Plaskett [1865-1941], the first Canadian astrophysicist of international repute). The stars also symbolize the asteroseismology, exoplanet transits and eclipses, and investigations into stellar variability through precise photometry achieved by the Microvariability and Oscillations of STars space telescope(MOST, 2003-).
The globular cluster recognizes the field of Helen Sawyer Hogg‘s (1905-1993) greatest scientific contributions (ca. 1926-ca. 1993), and the Helen Sawyer Hogg Telescope (HSHT) at the University of Toronto Southern Observatory at Cerro Las Campanas, one of Canada’s first ventures (1971-1997) in exploring off-shore astronomical installations, which has born lasting fruit in international cooperative installations exploring the full range of astrophysical phenomena, such as the Canada-France-Hawaii Telescope (CFHT, 1979-), the James Clerk Maxwell Telescope (JCMT, 1986-2015 [period of direct Canadian involvement & funding]), the Gemini Telescopes (North 1999-, South 2000-), the Atacama Large Millimetre Array (ALMA, 2011/2013-), the Square Kilometre Array (SKA, 2020-), and the Thirty Metre Telescope (TMT, ca. 2022-).
The spiral galaxy represents both the work of Canadian observational cosmologists (e.g., Sidney van den Bergh‘s classification of Galaxy morphology, Laura Ferrarese‘s work on the morphology & dynamics of early type galaxies), as well as the efforts of amateur Canadian observers of deep-sky objects (DSOs), and imagers.
The Moon symbolizes an object important for first nations’ calendrics, and the earliest recorded observations by Europeans in Canada (17th century lunar reports, and lunar eclipse reports). The Moon together with the stars symbolizes the practice of navigational astronomy on land and water, which was crucial to the formation of Canada. Finally, the Moon is as popular an object for RASC members to share with the public when doing outreach as it was 150 years ago.
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Beals, C. S., 1968. On the possibility of a catastrophic origin for the great arc of eastern Hudson Bay.
Beals, C.S. & Halliday, I. 1967: Impact Craters of the Earth and Moon, Journal of the Royal Astronomical Society of Canada, Vol. 61, p.295.
Brookfield M.E. 2006, THE GREAT ARC OF EASTERN HUDSON BAY, CANADA: PART OF THE LARGEST MULTIRINGED IMPACT BASIN ON EARTH? (Geological Society of America)
Caty, J.L. et al, 1976, A new astrobleme: Ile Rouleau structure: Canadian Journal of Earth Sciences, v.13.
Brent Dalrymple,Radiometric Dating Does Work!Reports of the National Center for Science Education
Dence, M. R. 1976 The Manicouagan impact structure. NASA Spec. Pub.
Dence M. R. 1972: The nature and significance of terrestrial impact structures. 24th Inter. Geol. Congr. Section 15, 77–89.
Dietz, R.S. 1947, Meteorite impact suggested by the orientation of shatter cones at the Kentland, Indiana, disturbance, Science 105, 42-76.
Dressler, B.O. & Sharpton, V.L. 1997: Breccia formation at a complex impact crater: Slate Islands, Lake Superior, Ontario, Canada. TECTONOPHYSICS, 1997 Vol.275, No.4, pp. 285-311.
Dressler et al 1995, New Observations at the Slate Islands Impact Structure, Lake Superior NASA CR-205312
French, Bevan M. 1998. Traces of Catastrophe, A handbook of Shock-Metamorphic effects, Lunar and Planetary Institute.
French, B. M.,The importance of being cratered:The new role of meteorite impact as a normal geological process. Meteoritics & Planetary Science 39, Nr 2, 169–197. 2004.
French, Bevan M. 2005: STALKING THE WILY SHATTER CONE, Impact Field Studies Group, Vol.2. Winter 2005.
French, Bevan M. & Koeberl, Christian 2009; The convincing identification of terrestrial meteorite impact structures: Department of Paleobiology, Smithsonian Institution, Washington, DC, USA
Gibson, H.M. & Spray, J.G. 1998, Shock-induced melting and vaporization of shatter cone surfaces: Evidence from the Sudbury impact structure, Meteoritics and Planetary Sciences, 33, 329-336.
Grieve and Head, 1983. R.A.F. Grieve and J.W. Head, The Manicouagan impact structure: An analysis of its original dimensions and form.
Grieve R.A.F. & Robertson P.B. 1975, IMPACT STRUCTURES IN CANADA: THEIR RECOGNITION AND CHARACTERISTICS, JRASC February 1975.
Grieve, R.A.F. et al 2002. The recognition of terrestrial impact structures, Bulletin of the Czech Geological Survey, Vol. 77, No. 4, 253–263.
Grieve, R.A.F. 2006, Impact Structures in Canada (Geological Association of Canada).
Haskin, L et al 1998, The case for an Imbrium origin of the Apollo thorium-rich impact-melt breccias. Meteoritics & Planetary Science, vol. 33, no. 5, pp. 959-975.
Kenkmann, T. et al, 2009, Low angle collision with Earth: The elliptical impact crater Matt Wilson, Northern Territory, Australia, Geology; May 2009; v. 37; no. 5; p. 459-462.
Koeberl, C. & French, B.M. 2009; The convincing identification of terrestrial meteorite impact structures: Department of Paleobiology, Smithsonian Institution, Washington, DC , USA
Maddock, R.H., 1983. Melt origin of fault-generated Pseudotachylites demonstrated by textures, Geology, Vol 11, no 2.
McKean, F.K. 1964, A Meteoritic Crater in the Pre-Cambrian Shield, METEORITICS Vol. 2, No. 3.
Meen V.B. 1957, Merewether Crater – A Possible Meteor Crater, Proceedings of the Geological Association of Canada, 9, 49-67.
Melosh, H.J. 1980. Cratering Mechanics – Observational, Experimental, and Theoretical. the Annual Review of Earth and Planetary Sciences (book), 8, 626p.
Melosh, H. J., 1989. Impact cratering: A geologic process New York, Oxford University Press.
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Murtaugh, J.G. 1972, Shock metamorphism in the Manicouagan cryptoexplosion structure, Quebec. Proc. 24th Int. Geol. Congr.
Nicolaysen, L. O., Reimold, W. U.; Vredefort shatter cones revisited – Journal of Geophysical Research: Solid Earth (1978–2012) Volume 104, Issue B3, pages 4911–4930, 10 March 1999.
Norton, O.R. 1998: ROCKS FROM SPACE, Mountain Press.
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Shoemaker, E.M. 1963, The Moon, Meteorites and Comets, “The Solar System”, vol IV.
Simonds, C.H. et al 1976, Thermal model for impact breccia lithification: Manicouagan and the moon. Proc. Lunar Sci. Conf. 7th (1976) p. 2509-2528.
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