A Brief History of Geologic Time

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By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life’s history. These key events frame the chapters in the story of life on earth and the system we use to bind all these chapters together is the Geologic Time Scale.

Thanks to Studio 252mya for their illustrations. You can find more of their work here: https://252mya.com/licensing

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References:
http://www.ucmp.berkeley.edu/history/steno.html
http://academic.emporia.edu/aberjame/histgeol/steno/steno.htm
http://www.pnas.org/content/112/47/14518.full.pdf
http://www.stratigraphy.org/ICSchart/ChronostratChart2013-01.pdf
https://www.geosociety.org/gsatoday/archive/25/9/pdf/i1052-5173-25-9-38.pdf
http://www.strata-smith.com/?page_id=279
https://blogs.scientificamerican.com/history-of-geology/march-30-1759-the-four-layers-of-earth/
http://earthscienceshistory.org/doi/pdf/10.17704/eshi.31.2.c2q4076006wn7751
http://www.le.ac.uk/gl/ads/SiberianTraps/AreaVolume.html
https://books.google.com/books?id=rmrGS9s-KewC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=o...
https://palaeoblog.blogspot.com/2011/10/born-this-day-giovanni-arduino.html
http://www.nature.com/ngeo/journal/v6/n1/full/ngeo1649.html?foxtrotcallback=true
http://www.pnas.org/content/95/19/11028.full
http://humanorigins.si.edu/human-characteristics/walking-upright
https://www.sciencemag.org/news/2015/10/scientists-may-have-found-earliest-evidence-life-earth
https://www.sciencedaily.com/releases/2013/01/130117084856.htm
http://www.ucmp.berkeley.edu/vendian/ediacaran.php
http://burgess-shale.rom.on.ca/en/science/origin/04-cambrian-explosion.php
https://science.nasa.gov/science-news/science-at-nasa/2002/28jan_extinction
http://www.planetary.org/blogs/jason-davis/2017/20170612-falklands-impact-crater.html
https://www.pbs.org/wgbh/evolution/library/03/1/l_031_01.html
https://www.sciencedaily.com/releases/2008/05/080521131541.htm
https://www.scientificamerican.com/article/the-beguiling-history-of-bees-excerpt/
https://www.scientificamerican.com/article/asteroid-killed-dinosaurs/
http://www.ucmp.berkeley.edu/tertiary/eocene.php
https://pubs.geoscienceworld.org/geology/article-abstract/36/3/251/29681/cooling-and-ice-growth-acro...
https://www.geol.umd.edu/~tholtz/G204/lectures/204grass.html
https://www.smithsonianmag.com/science-nature/sahelanthropus-tchadensis-ten-years-after-the-disocver...
https://www.livescience.com/40311-pleistocene-epoch.html
http://www.pnas.org/content/106/49/20641.full
http://evolution.berkeley.edu/evolibrary/article/history_04
http://www.ucmp.berkeley.edu/history/steno.html
Steno, N. (1916). 1669: De solido intra solidum naturaliter contento dissertationis prodromus. Florence, 78p.
Hancock, Paul L; Skinner, Brian J, Oxford Companion to the Earth, Oxford University Press, 2000
http://www.nature.com/news/anthropocene-the-human-age-1.17085
Addition to image credits: some footage from this episode is from VideoBlocks.com