Evidence for meteorite hypothesis of the Tunguska catastrophe

This is an interesting piece of news. ScienceDaily has the story.

Tunguska Catastrophe: Evidence Of Acid Rain Supports Meteorite Theory

The Tunguska catastrophe in 1908 evidently led to high levels of acid rain. This is the conclusion reached by Russian, Italian and German researchers based on the results of analyses of peat profiles taken from the disaster region. In peat samples corresponded to 1908 permafrost boundary they found significantly higher levels of the heavy nitrogen and carbon isotopes 15N and 13C.

As far as I know, the meteorite hypothesis is pretty well accepted, but it's still good to get more evidence for this.

If you are unaware of what the Tunguska Catastrophe is, I recommend the Wikipedia article on the subject.