To add another counter-example, "fossil air" is "A sample of air (for example in the bubbles trapped in an ice core) that preserves the composition of the envir

To add another counter-example, "fossil air" is "A sample of air (for example in the bubbles trapped in an ice core) that preserves the composition of the environment at the time it was deposited." - https://www.oxfordreference.com/display/10.1093/oi/authority.20110803095830490 https://www.oxfordreference.com/display/10.1093/oi/authority...