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Stop 12 at Haughton

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Proximal impact ejecta near the southern rim of Haughton
Aerial photograph of impact ejecta deposits of the Haughton structure
Photo: G. Osinski, University of Western Ontario
Inside the southwestern rim of Haughton

New geologic mapping of the Haughton impact structure by geologist Gordon Osinski has revealed the presence of proximal impact ejecta deposits near the southern rim of the Haughton structure. Two main types of ejecta have been recognized: (1) pale gray impact melt breccias similar, but not identical, to those seen in the interior of Haughton (see stops 2, 6, and 8), and (2) pale yellow to brown impact ejecta deposits (see picture below).

Haughton's ejecta deposits and large blocks as seen on the ground (person for scale)
The ejecta deposits as seen on the ground
Photo: G. Osinski, University of Western Ontario
Scale: Width of the large block above the person is approximately 20 meters

This photograph demonstrates the sheer power of impact events. The large blocks of rock above the person are up to 20 meters across and were hurled here from the center of the crater, where they were originally 700 meters below the surface before the impact event!

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