Sudbury Impact Field Trip, Ontario, Canada, August 1997

Unlike Tucson, Ontario is cool and green in September

Burkhard Dressler of the Lunar and Planetary Institute leads the fieldtrip

Geologists seem fascinated by rocks

I thought the waterfall was prettier

Intrepid Zibi, who is prettier still, takes a break during the hike

Jay Melosh inspects shatter cones

Shatter Cones : these distinctive conical fractures in the rock are testament to the nearby Wanapitei impact, which now forms a lake. The cones are caused by the shock wave of the impact passing through the rock, and the examples here are among the best in the world

Breccia / Impact Melt. These chunks of rock got frozen in place in rock melted by the large Sudbury impact

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