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References:
IMAGE: Horseshoe crab
https://pixnio.com/fauna-animals/crabs-and-lobsters/horseshoe-crabs-pictures/horseshoe-crab-in-sand
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/arthropods_10
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/trilo08/archivos/TRILOBITE.pdf (oldest trilobites)
SOURCE: http://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2007.00746.x/full (oldest horseshoe crabs)
IMAGE: bird skull https://etc.usf.edu/clipart/73400/73460/73460_skullfowl.htm
IMAGE: reptile skull (Px = premaxilla) https://en.wikipedia.org/wiki/Jugal_bone#/media/File:Gegenbaur_1870_skull_homology_color.png
IMAGE: Limusaurus https://commons.wikimedia.org/wiki/File:Limusaurus_runner.jpg
Source: http://b3.ifrm.com/30233/130/0/p3001488/PIIS0960982216312696.pdf
IMAGE: Archaeornithura https://commons.wikimedia.org/wiki/File:Archaeornithura_meemannae_Holotype.jpg
MAGE: Archaeopteryx https://commons.wikimedia.org/wiki/File:Archaeopteryx_fossil.jpg
SOURCE: Paleo Art
https://naturalhistory.si.edu/exhibits/backyard-dinosaurs/reconstructing-animals.cfm
SOURCE: Digital reconstruction https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5098973/
IMAGE: fossilization https://www.nature.com/scientificamerican/journal/v23/n2s/box/scientificamericandinosaurs0514-104_BX1.html
SOURCE: fossilization
http://www.geo.arizona.edu/geo3xx/geo308/FoldersOnServer/2003/1fossil&taph&ichno.htm
SOURCE: Anthropocene
http://environment.harvard.edu/news/faculty-news/human-impact-has-pushed-earth-anthropocene-scientists-say
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