Eons Livestream Q&A

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References:
IMAGE: Horseshoe crab
https://pixnio.com/fauna-anima....ls/crabs-and-lobster
IMAGE: Trilobite https://commons.wikimedia.org/wiki/File:Megalaspides_01.jpg?fastcci_from=204367&c1=204367&c2=3618826&d1=15&d2=0&s=200
IMAGE: Arthropod family Tree
https://evolution.berkeley.edu..../evolibrary/article/
And although horseshoe crabs made it to modern times and trilobites didn’t, they both have ancient beginnings. The oldest known trilobite is ~540 million years old, but the horseshoe crabs weren’t far behind with the earliest example showing up ~445 million years ago. So technically just looking at a horseshoe crab you’re looking back millions of years into the past.
SOURCE: http://www.igme.es/museo/trilo....08/archivos/TRILOBIT (oldest trilobites)
SOURCE: http://onlinelibrary.wiley.com..../doi/10.1111/j.1475- (oldest horseshoe crabs)

IMAGE: bird skull https://etc.usf.edu/clipart/73....400/73460/73460_skul
IMAGE: reptile skull (Px = premaxilla) https://en.wikipedia.org/wiki/....Jugal_bone#/media/Fi

IMAGE: Limusaurus https://commons.wikimedia.org/....wiki/File:Limusaurus
Source: http://b3.ifrm.com/30233/130/0..../p3001488/PIIS096098

IMAGE: Archaeornithura https://commons.wikimedia.org/....wiki/File:Archaeorni
MAGE: Archaeopteryx https://commons.wikimedia.org/....wiki/File:Archaeopte

SOURCE: Paleo Art
https://naturalhistory.si.edu/....exhibits/backyard-di
SOURCE: Digital reconstruction https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC50989

IMAGE: fossilization https://www.nature.com/scienti....ficamerican/journal/
SOURCE: fossilization
http://www.geo.arizona.edu/geo3xx/geo308/FoldersOnServer/2003/1fossil&taph&ichno.htm
SOURCE: Anthropocene
http://environment.harvard.edu..../news/faculty-news/h