[dirtboy]

The geologic record shows that cataclysmic volcanic eruptions occurred around the same time as two periods of mass extinctions.

There is also evidence that the two may be linked. The Shiva crater is contemporaneous with the Chicxulub in the Yucatan and some geologists link it to the Deccan flood basalts. The Siberian flood basalts are contemporaneous with the P-T boundary, and are large enough to have covered a large impact crater.

[Poohbah]

Ever shoot a watermelon with a high-power rifle?

Think of "hydrostatic shock" on a planetary scale.

[LibWhacker]

Makes a lot of sense to me. Thirty years ago they didn't think it happened with run-of-the-mill extinction meteorites and pointed to the moon as proof.