Via geology.com:
Gas bubbles trapped in amber show an oxygen-rich Cretaceous atmosphere
Republished from a information release posted by USGS in June, 2009.
Photo: "Amber - the fossilized resin of conifer trees - provides a unique means of protecting intricate samples of the past. This mosquito, lying trapped for 45 million years in a piece of amber, is almost perfectly preserved. USGS image."
In addition: amber in India's Cambay area has new information too.
