Darwin\'s geologic development (Introduction)
The early years:-http://blogs.scientificamerican.com/history-of-geology/2013/02/24/darwins-tree-and-deep-time/?WT_mc_id=SA_DD_20130225
The early years:-http://blogs.scientificamerican.com/history-of-geology/2013/02/24/darwins-tree-and-deep-time/?WT_mc_id=SA_DD_20130225