meteorite

Precambrian Impact Layer 'Discovered' In Scotland

A Precambrian impact as been 'discovered' in NW Scotland.

The Stac Fada Member of the Torridonian Stoer Group, previously believed to be a volcanic mudflow deposit has been reinterpreted as a fossilised ejecta blanket from a meteorite impact about 1.2 billion years ago.

Geology article abstract
http://www.gsajournals.org/perlserv/?request=get-abstract&doi=10.1130%2FG24454A.1

BBC News Story
http://news.bbc.co.uk/1/hi/sci/tech/7314329.stm

Good page on previous interpretation with outcrop and thin section photos from Oxford Uni.
http://www.earth.ox.ac.uk/~oesis/nws/nws-a98-st1.html#field