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The Holleford Crater - Hartington, Ontario Canada
Posted by: Groundspeak Premium Member model12
N 44° 27.349 W 076° 37.672
18T E 370489 N 4923790
Quick Description: A meteor impact crater with a great view from the edge of the crater.
Location: Ontario, Canada
Date Posted: 4/26/2011 8:49:43 PM
Waymark Code: WMBAMM
Published By: Groundspeak Regular Member monkeykat
Views: 34

Long Description:
A meteorite traveling 55,000 kilometres per hour smashed into the earth here eons ago, blasting a hole 244 metres deep and 2.5 kilometres wide. Aerial photographs revealed the crater in 1955, and since then scientists have pieced together much of its geological history. Analyses of drill samples suggest that the meteorite struck in the late Precambrian or early Cambrian period (between 450 and 650 million years ago). At first the depression filled with water becoming a circular lake. Later Palaeozoic seas swept in sediments filling the crater to its present depth of about 30 metres. The explosive impact of the meteorite (estimated to have been only 90 metres in diameter) is still evident in the hundreds of metres of shattered rock that drilling has detected beneath the original crater floor.

In 1955, the Holleford meteor crater was discovered early in the systematic search of air photographs. The crater contains a thick layer of Palaeozoic sediments but still has the remnant of a rim, also mainly covered by sediments, rising 100 feet above the central region around approximately half the circumference. Beals (1960) has described the magnetic, seismic and gravity studies which preceded a diamond drilling program. The geophysical observations are well explained by the layers of sedimentary limestone above the lens of breccia which was revealed by the three drill holes sunk at varying distances from the centre. The identification of coesite in the drill core from Holleford and the microbrecciation of individual crystals revealed by microscopic studies (Bunch and Cohen 1963) demonstrate that strong shock effects were involved in the formation of this crater and support its identification as a meteorite crater.

For more info check out (visit link)
Type of Crater: Simple

Crater Diameter: 2.5km

Age of Crater: 500,000,000.00

Crater Web Page: [Web Link]

View from the Coordinates:
Standing at the Ontario Provincial plaque you can see the depression in the ground as it swells up to the western edge of the crater.


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Recent Visits/Logs:
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Mr. Packrat visited The Holleford Crater - Hartington, Ontario Canada 5/24/2014 Mr. Packrat visited it
Fee&me visited The Holleford Crater - Hartington, Ontario Canada 11/8/2013 Fee&me visited it
denben visited The Holleford Crater - Hartington, Ontario Canada 10/28/2012 denben visited it
jack2u visited The Holleford Crater - Hartington, Ontario Canada 4/23/2012 jack2u visited it
BWORM visited The Holleford Crater - Hartington, Ontario Canada 2/6/2012 BWORM visited it
Trail Blaisers visited The Holleford Crater - Hartington, Ontario Canada 9/19/2011 Trail Blaisers visited it
mTn_biKer65 visited The Holleford Crater - Hartington, Ontario Canada 9/1/2011 mTn_biKer65 visited it
hypocorism visited The Holleford Crater - Hartington, Ontario Canada 8/28/2011 hypocorism visited it
model12 visited The Holleford Crater - Hartington, Ontario Canada 4/28/2011 model12 visited it
Canadianzombie visited The Holleford Crater - Hartington, Ontario Canada 10/18/2010 Canadianzombie visited it

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