Holleford crater: Difference between revisions
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'''Holleford Crater''' is a [[meteorite]] [[impact crater|crater]] near the community of Holleford, part of [[South Frontenac, Ontario|South Frontenac]], [[Ontario]], [[Canada]]. It is {{convert|2.35|km|mi|1}} in [[diameter]] and the age is estimated to be 550 ± 100 [[million]] years ([[Ediacaran]] or [[Cambrian]]). Although there is a surface depression over the area, the crater itself is not exposed at the surface.<ref>{{cite Earth Impact DB | name = Holleford| accessdate = 2009-08-15}}</ref> |
'''Holleford Crater''' is a [[meteorite]] [[impact crater|crater]] near the community of Holleford, part of [[South Frontenac, Ontario|South Frontenac]], [[Ontario]], [[Canada]]. It is {{convert|2.35|km|mi|1}} in [[diameter]] and the age is estimated to be 550 ± 100 [[million]] years ([[Ediacaran]] or [[Cambrian]]). Although there is a surface depression over the area, the crater itself is not exposed at the surface.<ref>{{cite Earth Impact DB | name = Holleford| accessdate = 2009-08-15}}</ref> |
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Holleford Crater was discovered in the 1950s during analysis of [[aerial photography|aerial photographs]] under the direction of Dr. Carlyle S. Beals of the [[Dominion Observatory]] in [[Ottawa]], Canada. In the late 1950s, the [[Geological Survey of Canada]] conducted a series of four [[geophysical survey|geophysical]] studies: |
Holleford Crater was discovered in the 1950s during analysis of [[aerial photography|aerial photographs]] under the direction of Dr. Carlyle S. Beals of the [[Dominion Observatory]] in [[Ottawa]], Canada. In the late 1950s, the [[Geological Survey of Canada]] conducted a series of four [[geophysical survey|geophysical]] studies: (1) [[Magnetometer|magnetic]] observations; (2) [[Reflection seismology|seismic]] studies; (3) [[Exploration geophysics|gravity]] studies; and (4) a [[Drilling rig|diamond drilling]] program. The seismic and gravity studies and the drilling all produced data consistent with the impact theory. The [[Core sample|drill core]] revealed [[breccia]] and similar materials at predicted depths. The studies concluded that an ancient meteorite impact crater is present in the [[Precambrian]] bedrock below the surface. The meteorite was estimated to be approximately 100 meters in diameter<ref name="Helmstaedt">{{cite web|url=http://130.15.110.48/faculty/fac-dineva/SSAM/field_trip_manual.pdf|title=Field Trip Guide: Geology of the Kingston Area|last=Helmstaedt|first=H.|author2=Godin L.|date=2008|pages=15-16|accessdate=29 January 2013}}</ref> and to have impacted at approximately 55 thousand kilometers per hour. |
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==Location== |
== Location == |
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Holleford Crater is located on the Babcook Family Homestead Farm properties (including the original Babcook Homestead Farm, established 1803, owned by the family of the late Frederick and Jean Babcook, at [[Hartington, Ontario]] (about 1/2 hour north of [[Kingston Ontario]])).<ref>{{cite news|title= At 106, Spokane man the oldest Canadian WWI vet|url= http://www.komonews.com/news/local/8518497.html|agency= Associated Press|publisher= [[KOMO-TV]]|date= 2007-07-15|accessdate= 2009-12-29}}</ref> |
Holleford Crater is located on the Babcook Family Homestead Farm properties (including the original Babcook Homestead Farm, established 1803, owned by the family of the late Frederick and Jean Babcook, at [[Hartington, Ontario]] (about 1/2 hour north of [[Kingston Ontario]])).<ref>{{cite news|title= At 106, Spokane man the oldest Canadian WWI vet|url= http://www.komonews.com/news/local/8518497.html|agency= Associated Press|publisher= [[KOMO-TV]]|date= 2007-07-15|accessdate= 2009-12-29}}</ref> |
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Starting in the 1960s, the site has been visited frequently by geology students from [[Queen's University]], at Kingston. In the 1970s, as a result of efforts by the late Frederick Babcook, an official commemorative plaque was erected along the road beside the Babcook Homestead Farm by the Province of Ontario. Queen's University's Miller Hall Museum of Geology maintains a display dedicated to the Holleford Meteorite Crater.{{Citation needed|date=October 2009}} |
Starting in the 1960s, the site has been visited frequently by geology students from [[Queen's University]], at Kingston. In the 1970s, as a result of efforts by the late Frederick Babcook, an official commemorative plaque was erected along the road beside the Babcook Homestead Farm by the Province of Ontario. Queen's University's Miller Hall Museum of Geology maintains a display dedicated to the Holleford Meteorite Crater.{{Citation needed|date=October 2009}} |
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==References== |
== References == |
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{{Reflist}} |
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*{{cite web|url= http://atlas.nrcan.gc.ca/site/english/maps/topo/map |title= Toporama - Topographic Map Sheet 31C7|work= [[Atlas of Canada]]|publisher= [[Natural Resources Canada]]|accessdate= 2009-12-29}} |
*{{cite web|url= http://atlas.nrcan.gc.ca/site/english/maps/topo/map |title= Toporama - Topographic Map Sheet 31C7|work= [[Atlas of Canada]]|publisher= [[Natural Resources Canada]]|accessdate= 2009-12-29}} |
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== External links == |
== External links == |
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{{commons category}} |
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* [http://ottawa-rasc.ca/wiki/index.php?title=Odale-Articles-Holleford Aerial Exploration of the Holleford Structure] |
* [http://ottawa-rasc.ca/wiki/index.php?title=Odale-Articles-Holleford Aerial Exploration of the Holleford Structure] |
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Revision as of 21:16, 12 September 2014
Holleford Crater is a meteorite crater near the community of Holleford, part of South Frontenac, Ontario, Canada. It is 2.35 kilometres (1.5 mi) in diameter and the age is estimated to be 550 ± 100 million years (Ediacaran or Cambrian). Although there is a surface depression over the area, the crater itself is not exposed at the surface.[1]
Holleford Crater was discovered in the 1950s during analysis of aerial photographs under the direction of Dr. Carlyle S. Beals of the Dominion Observatory in Ottawa, Canada. In the late 1950s, the Geological Survey of Canada conducted a series of four geophysical studies: (1) magnetic observations; (2) seismic studies; (3) gravity studies; and (4) a diamond drilling program. The seismic and gravity studies and the drilling all produced data consistent with the impact theory. The drill core revealed breccia and similar materials at predicted depths. The studies concluded that an ancient meteorite impact crater is present in the Precambrian bedrock below the surface. The meteorite was estimated to be approximately 100 meters in diameter[2] and to have impacted at approximately 55 thousand kilometers per hour.
Location
Holleford Crater is located on the Babcook Family Homestead Farm properties (including the original Babcook Homestead Farm, established 1803, owned by the family of the late Frederick and Jean Babcook, at Hartington, Ontario (about 1/2 hour north of Kingston Ontario)).[3] Starting in the 1960s, the site has been visited frequently by geology students from Queen's University, at Kingston. In the 1970s, as a result of efforts by the late Frederick Babcook, an official commemorative plaque was erected along the road beside the Babcook Homestead Farm by the Province of Ontario. Queen's University's Miller Hall Museum of Geology maintains a display dedicated to the Holleford Meteorite Crater.[citation needed]
References
- ^ "Holleford". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-15.
- ^ Helmstaedt, H.; Godin L. (2008). "Field Trip Guide: Geology of the Kingston Area" (PDF). pp. 15–16. Retrieved 29 January 2013.
- ^ "At 106, Spokane man the oldest Canadian WWI vet". KOMO-TV. Associated Press. 2007-07-15. Retrieved 2009-12-29.
- "Toporama - Topographic Map Sheet 31C7". Atlas of Canada. Natural Resources Canada. Retrieved 2009-12-29.
External links
