Naturally, this conclusion met with quite a lot of skepticism initially.

However, the search was on: Could we actually locate an impact crater of appropriate size and age to be associated with the mass extinction 65 million years ago?

In 1989 a 170km diameter semi-circle of sinkholes was identified in the Yucatan Peninsula in an area called Chicxulub.

http://www.lpl.arizona.edu/SIC/impact_cratering/Chicxulub/Discovering_crater.html

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