Indeed - Nature had an news article last week (12 May page 133) about the possibility of defining a new epoch, the Anthropocene. If you cannot get behind pay wall let me know and ...
There seem to be many comments on the WWW on Anthropocene including a Wikipedia article.http://en.wikipedia.org/wiki/Anthropocene
Not particularly discussing the formation of rock, but the influence of Man on the environment. And I suppose future man will be able to find signs of 20th
century main in the rock records including Nuclear Fallout from WWII, Nuclear Testing, Chernobyl, and Fukushima.
The question is how do you define Anthropocene, and how is it differentiated from Holocene?
Beginning 12,000 years ago at the beginning of the Holocene?
Beginning 8,000 years ago after an early human population expansion?
Beginning 2,000-3,000 years ago, in the time of Christ, Greeks, Egyptians, etc?
Beginning in 1776 & the American Revolution?
Beginning in 1900, with the automobile, airplane, mass production, etc?