From: Memorandum by Lynn Lundberg, Materials Consultant, 2832 W. 33rd N. Idaho Falls, ID 83402 (pdf 935 kb).

The mechanics of oblique hypervelocity impact forces the "butterfly" ejecta deposition pattern...marked by the tree fall be skewed downrange from the impact point...Lake Cheko. The "butterfly" planform is commonly seen, for example, around craters on Mars formed by low angle impacts.
The data also places the epicenter of the impact at the deepest point of Lake Cheko rather than at the assumed location southeast of the lake.

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