Holleford crater

Holleford crater

Holleford Crater is a meteorite crater in Ontario, Canada. It is 2.35 km 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.

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 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). Starting in the 1960s, the site has been frequently visited 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.

External links

* [http://www.unb.ca/passc/ImpactDatabase/ Earth Impact Database]
* [http://www.ottawa.rasc.ca/articles/odale_chuck/earth_craters/holleford/index.html Aerial Exploration of the Holleford Structure]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • John Babcock — Infobox Military Person name= John Babcock born= birth date|mf=yes|1900|7|23 caption= nickname= placeofbirth= South Frontenac, Ontario, Canada placeofdeath= allegiance= flagicon|Canada Canadian, flag|United States of America branch= Canadian… …   Wikipedia

  • Kingston, Ontario — Kingston   City   Kingston City Skyline from Fort Henry Hill Nickname(s): Limestone City …   Wikipedia

  • Liste De Cratères D'impact Sur Terre — Cet article est une liste de cratères d impact sur Terre, Sommaire 1 Liste des cratères terrestres 2 Par zones géographiques 2.1 Afrique 2.2 …   Wikipédia en Français

  • Liste de crateres d'impact sur Terre — Liste de cratères d impact sur Terre Cet article est une liste de cratères d impact sur Terre, Sommaire 1 Liste des cratères terrestres 2 Par zones géographiques 2.1 Afrique 2.2 …   Wikipédia en Français

  • Liste de cratères d'impact sur Terre — Cette liste est incomplète ou mal ordonnée. Votre aide est la bienvenue ! Cet article est une liste de cratères d impact sur Terre, Sommaire 1 Liste des cratères terrestres 2 …   Wikipédia en Français

  • Liste de cratères d'impact sur terre — Cet article est une liste de cratères d impact sur Terre, Sommaire 1 Liste des cratères terrestres 2 Par zones géographiques 2.1 Afrique 2.2 …   Wikipédia en Français

  • Liste der Einschlagkrater der Erde —  Karte mit allen Koordinaten: OSM, Google oder …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”