This is the first episode of a series about our amazing past, about the history of life on earth. These videos don't pretend to be exaustive on such a complex subject. If you want, feel free to consult these links... or to buy some good, updated book! ;-) About timeline: http://geomaps.wr.usgs.gov/parks/gtime/timescale.html Note: don't be surprised if, reading N different sources, you'll find N different beginning/ending time for each period... scientists often have different opinions about these things! About layers: http://en.wikipedia.org/wiki/Stratum Many links will come with each episode! --- This video contains an intentional mistake... it's about Ptery! ;-) Try your guess! --- The Ptery character is copyrighted. These are the links to the copyrights: http://www.myfreecopyright.com/registered_mcn/C52_YU3B_1250 http://www.myfreecopyright.com/registered_mcn/C27_C5NI_8929 --- Thank you for watching! Prehistorically yours Daniele
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