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Back in the late Miocene epoch, there was an island--or maybe a group of islands-- in the Mediterranean Sea that was populated with fantastic giant beasts. It’s a lesson in the very strange, but very real, powers of natural selection.

Thank you to these paleoartists for allowing us to use their wonderful illustrations:
Franz Anthony: https://252mya.com/gallery/franz-anthony
Stanton Fink: https://www.deviantart.com/avancna
Julio Lacerda: https://252mya.com/gallery/julio-lacerda
Nobu Tamura: https://spinops.blogspot.com/
Ceri Thomas: http://alphynix.tumblr.com/

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, XULIN GE, Po Foon Kwong, Larry Wilson, Merri Snaidman, Renzo Caimi, Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, الخليفي سلطان, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

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References: https://bit.ly/2VCS4WF

Viewers like you help make PBS (Thank you

Viewers like you help make PBS (Thank you

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You can check out Google's Science Journal app at https://g.co/sciencejournal

The mammoths fossils found on the Channel Islands off the coast of southern California are much smaller than their relatives found on the mainland. They were so small that they came to be seen as their own species. How did they get there? And why were they so small?

Thanks to Ceri Thomas for the mammoth reconstructions throughout this episode. Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com

Thanks to Julio Lacerda and Studio 252mya for the Palaeoloxodon illustrations. You can find more of Julio's work here: https://252mya.com/gallery/julio-lacerda

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

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Want to follow Eons elsewhere on the internet?
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References:
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1940&context=usgsstaffpub
https://www.nhm-wien.ac.at/jar....t/prj3/nhm/data/uplo
https://www.researchgate.net/p....ublication/288262862
“Extreme expansion of the olfactory receptor gene repertoire in African elephants and evolutionary dynamics of orthologous gene groups in 13 placental mammals.” Niimura Y, Matsui A, Touhara K. 2014.
https://web.archive.org/web/20....060508113748/http://
https://www.sciencedirect.com/....science/article/pii/
https://kundoc.com/pdf-on-the-....importance-of-strati
https://www.app.pan.pl/archive..../published/app61/app  
https://www.jstor.org/stable/2....844657?seq=1#page_sc  
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.541.6488&rep=rep1&type=pdf
Evolution of Island Mammals: Adaptation and Extinction of Placental Mammals on Islands by Alexandra van der Geer, George Lyras, John de Vos and Michael Dermitzakis.
Niimura Y, Matsui A, Touhara K. 2014. Extreme expansion of the olfactory receptor gene repertoire in African elephants and evolutionary dynamics of orthologous gene groups in 13 placental mammals. Genome Res doi: 10.1101/gr.169532.113
https://www.nhm-wien.ac.at/jar....t/prj3/nhm/data/uplo
"Sea level, paleogeography, and archeology on California's Northern
Channel Islands," by Reeder-Myers et al. 2015.
https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1940&context=usgsstaffpub
https://web.archive.org/web/20....060508113748/http://
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.896.6234&rep=rep1&type=pdf
https://kundoc.com/pdf-on-the-....importance-of-strati
https://www.sciencedirect.com/....science/article/pii/
http://natural-history.uoregon.....edu/research/paleoc
https://www.nhm-wien.ac.at/jar....t/prj3/nhm/data/uplo
https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1940&context=usgsstaffpub

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Viewers like you help make PBS (Thank you

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In order to understand where hearts came from, we have to go back to the earliest common ancestor of everything that has a heart. It took hundreds of millions of years, and countless different iterations of the same basic structure to lead to the heart that you have today.

Thanks as always to Nobu Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/

Thanks to Ceri Thomas for the Ichthyostega reconstruction. Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

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References:
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC53784
https://link.springer.com/arti....cle/10.1007%2Fs00018
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC26142
https://onlinelibrary.wiley.co....m/doi/abs/10.1111/j.
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC30974
https://www.nature.com/articles/ncomms4560
http://www.nhm.ac.uk/discover/....news/2014/april/earl
http://www.sci-news.com/paleon....tology/science-fossi
https://journals.plos.org/plos....one/article?id=10.13
https://www.ncbi.nlm.nih.gov/pubmed/7915669
https://www.ncbi.nlm.nih.gov/pubmed/10355031
https://genent.cals.ncsu.edu/b....ug-bytes/circulatory
https://onlinelibrary.wiley.co....m/doi/full/10.1111/b
http://www.fossilmuseum.net/Fo....ssil_Sites/whitesea/
http://www.tulane.edu/~bfleury..../diversity/labguide/
https://academic.oup.com/mollu....s/article-abstract/4
https://circsystems.weebly.com/mollusca.html
https://www.britannica.com/ani....mal/mollusk/Evolutio
https://onlinelibrary.wiley.co....m/doi/full/10.1111/j
https://www.thoughtco.com/evol....ution-of-the-human-h
https://www.sciencedirect.com/....science/article/pii/
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC44596
https://www.ncbi.nlm.nih.gov/pubmed/28905992

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The Best-Of Nature League: https://www.youtube.com/playli....st?list=PLZftFO1i4jN

The ability to make and use fire has fundamentally changed the arc of our evolution. The bodies we have today were, in many ways, shaped by that time when we first tamed fire.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, Robert Amling, Po Foon Kwong, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, الخليفي سلطان, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

If you'd like to support the channel, head over to http://patreon.com/eons and pledge for some cool rewards!

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References:
http://humanorigins.si.edu/evi....dence/human-fossils/
http://humanorigins.si.edu/evi....dence/human-fossils/
Alperson-Afil, N. (2008). Continual fire-making by hominins at Gesher Benot Ya ‘aqov, Israel. Quaternary Science Reviews, 27(17-18), 1733-1739.
Barkai, R., Rosell, J., Blasco, R., & Gopher, A. (2017). Fire for a reason: Barbecue at middle Pleistocene Qesem cave, Israel. Current Anthropology, 58(S16), S314-S328.
Berna, F., Goldberg, P., Horwitz, L. K., Brink, J., Holt, S., Bamford, M., & Chazan, M. (2012). Microstratigraphic evidence of in situ fire in the Acheulean strata of Wonderwerk Cave, Northern Cape province, South Africa. Proceedings of the National Academy of Sciences, 109(20), E1215-E1220.
Blain, H. A., Agustí, J., Lordkipanidze, D., Rook, L., & Delfino, M. (2014). Paleoclimatic and paleoenvironmental context of the Early Pleistocene hominins from Dmanisi (Georgia, Lesser Caucasus) inferred from the herpetofaunal assemblage. Quaternary science reviews, 105, 136-150.
Carmody, R. N., & Wrangham, R. W. (2009). The energetic significance of cooking. Journal of Human Evolution, 57(4), 379-391.
Clark, J. D., & Harris, J. W. (1985). Fire and its roles in early hominid lifeways. African Archaeological Review, 3(1), 3-27.
Gowlett, J. A. (2016). The discovery of fire by humans: a long and convoluted process. Philosophical Transactions of the Royal Society B: Biological Sciences, 371(1696), 20150164.
Gowlett, J. A., & Wrangham, R. W. (2013). Earliest fire in Africa: towards the convergence of archaeological evidence and the cooking hypothesis. Azania: Archaeological Research in Africa, 48(1), 5-30.
Hlubik, S., Berna, F., Feibel, C., Braun, D., & Harris, J. W. (2017). Researching the nature of fire at 1.5 Mya on the site of FxJj20 AB, Koobi Fora, Kenya, using high-resolution spatial analysis and FTIR spectrometry. Current Anthropology, 58(S16), S243-S257.
MacDonald, K. (2017). The use of fire and human distribution. Temperature, 4(2), 153-165.
Pruetz, J. D., & LaDuke, T. C. (2010). Brief communication: Reaction to fire by savanna chimpanzees (Pan troglodytes verus) at Fongoli, Senegal: Conceptualization of “fire behavior” and the case for a chimpanzee model. American Journal of Physical Anthropology: The Official Publication of the American Association of Physical Anthropologists, 141(4), 646-650.
Roebroeks, W., & Villa, P. (2011). On the earliest evidence for habitual use of fire in Europe. Proceedings of the National Academy of Sciences, 108(13), 5209-5214.
Zink, K. D., & Lieberman, D. E. (2016). Impact of meat and Lower Palaeolithic food processing techniques on chewing in humans. Nature, 531(7595), 500.

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Check out Origin of Everything: https://www.youtube.com/channe....l/UCiB8h9jD2Mlxx96ZF

If you’ve ever been to, or lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic.

Thanks to Dmitry Bogdanov, Nobu Tamura, C.R. Scotese, NASA and the many others listed throughout the video for making their images available to use.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Anel Salas, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, John Vanek, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Sapjes, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ruben Winter, Ron Harvey Jr, Jacob Gerke, Alex Yan

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Want to follow Eons elsewhere on the internet?
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References:
Oceans of Kansas: A Natural History of the Western Interior Seaway (Second Edition) by Michael J. Everhart.
https://www.tandfonline.com/do....i/abs/10.1080/027246
https://www.researchgate.net/p....ublication/259517413
https://www.researchgate.net/p....rofile/Joshua_Slatte
https://www.researchgate.net/p....ublication/321632109
https://www.tandfonline.com/do....i/abs/10.1080/027246
https://www.jstor.org/stable/1306568
https://www.sciencedirect.com/....science/article/pii/
https://pubs.er.usgs.gov/publication/pp1561
http://rspb.royalsocietypublis....hing.org/content/278
https://link.springer.com/arti....cle/10.1007%2FBF0299
https://pubs.geoscienceworld.o....rg/gsa/geology/artic
https://www.rushcounty.org/Pos....tRockMuseum/PostRock

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The short-faced bears turned out to be remarkably adaptable, undergoing radical changes to meet the demands of two changing continents. And yet, for reasons we don’t quite understand, their adaptability wasn’t enough to keep them from going extinct.   

Thanks to Fabrizio De Rossi and Studio 252mya for the Arctodus and Arctotherium illustrations. You can find more of their work here: https://252mya.com/gallery/fabrizio-de-rossi

And thanks to Ceri Thomas for the Plionarctos and Arctotherium reconstructions! Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:

Katie Fichtner, Anthony Callaghan, Robert Amling, Po Foon Kwong, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, الخليفي سلطان, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

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References: https://docs.google.com/docume....nt/d/1Eg5riA7VgBKCFv

Viewers like you help make PBS (Thank you

Viewers like you help make PBS (Thank you

This episode on the Tully Monster is supported by Squarespace. If you visit squarespace.com and use offer code "eons", you'll get 10% off your first purchase.

There are animals in the fossil record that challenge some of our most basic ideas about what animals are supposed to look like. If there ever was a monster on this planet that was worthy of the name, it might have been the Tully Monster.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Image credits:
Banffia - Royal Ontario Museum, Jean-Bernard Caron: http://www.burgess-shale.rom.on.ca/

Thanks to Julio Lacerda and Studio 252mya for the Tully Monster illustration. You can find more of Julio's work here: https://252mya.com/gallery/julio-lacerda

Check out other PBS Digital Studios channels:
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References:
http://news.yale.edu/2016/03/1....6/solving-mystery-tu
http://www.nature.com/nature/j....ournal/v532/n7600/ab
http://sitn.hms.harvard.edu/fl....ash/2016/enigmatic-t
https://blogs.scientificameric....an.com/laelaps/tully
https://www.sciencedaily.com/r....eleases/2017/02/1702
http://www.museum.state.il.us/....exhibits/symbols/fos
http://scienceblogs.com/laelap....s/2010/03/12/your-fr
https://www.eurekalert.org/pub...._releases/2017-02/uo
https://www.anl.gov/photos/tul....ly-monster-secrets-r
https://www.anl.gov/articles/s....olving-mystery-tully
https://www.fieldmuseum.org/sc....ience/blog/monster-m

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A huge and diverse subfamily of dogs, the bone-crushers patrolled North America for more than thirty million years, before they disappeared in the not-too-distant past. So what happened to the biggest dogs that ever lived?

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:
Katie Fichtner, Aldo Espinosa Zúñiga, Kelby Reid, Steph Summerfield, Todd Dittman, Betsy Radley, Svetlana Pylaeva, Colin Sylvester, Philip Slingerland, John Vanek, Jose Garcia, Noah offitzer, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Wilco Verweij, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Elysha Nygård, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Ehit Dinesh Agarwal, Sapjes, Daisuke Goto, Zachary Winkler, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ruben Winter, Ron Harvey Jr, Joshua Mitchell, Johnny Li, Jacob Gerke, Katie M Vasilescu, Brandon Burke, Alex Yan

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Want to follow Eons elsewhere on the internet?
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References:
Dogs: Their Fossil Relatives and Evolutionary History by Xiaoming Wang & Richard H. Tedford.
The Princeton Field Guide to Prehistoric Mammals by Donald Prothero.
Evolution of Tertiary Mammals in North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals edited by Christine M. Janis.
The Skeleton of the Borophaginae (Carnivora, Canidae): Morphology and Function by Kathleen Munthe.
Vertebrates: Structures and Functions by S.M. Kisia.
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC45072
http://digitallibrary.amnh.org..../bitstream/handle/22
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC59369
https://www.ncbi.nlm.nih.gov/pubmed/26285033
https://www.researchgate.net/publication/267156822_Phylogenetic_systematics_of_the_Borophaginae_Carnivora_Canidae?enrichId=rgreq-d5b9b9334f3e7d5206bb87428d1dc7db-XXX&enrichSource=Y292ZXJQYWdlOzI2NzE1NjgyMjtBUzoxNTQ5NTc4MzE0NzkyOTZAMTQxMzk1NjIzNDUyOA%3D%3D&el=1_x_2&_esc=publicationCoverPdf
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC59639
https://www.cambridge.org/core..../journals/journal-of
http://www.naturalhistorymag.c....om/htmlsite/0708/070

One of the most dynamic, transformative, and potentially dangerous features in North America is also responsible for some of the continent’s most amazing fossil deposits. It’s a supervolcano we now call Yellowstone.

Thanks to Rick Otto and the Ashfall Fossil Beds State Historical Park for their help with this episode!

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Super special thanks to the following Patreon patrons for helping make Eons possible:
Katie Fichtner, Aldo Espinosa Zúñiga, Kelby Reid, Steph Summerfield, Todd Dittman, Betsy Radley, Svetlana Pylaeva, Colin Sylvester, Philip Slingerland, John Vanek, Jose Garcia, Noah offitzer, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Wilco Verweij, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Elysha Nygård, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Ehit Dinesh Agarwal, Sapjes, Daisuke Goto, Zachary Winkler, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ruben Winter, Ron Harvey Jr, Joshua Mitchell, Johnny Li, Jacob Gerke, Katie M Vasilescu, Brandon Burke, Alex Yan

If you'd like to support the channel, head over to http://patreon.com/eons and pledge for some cool rewards!

Want to follow Eons elsewhere on the internet?
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References:
https://www.researchgate.net/p....ublication/300919200
https://www.journals.uchicago.....edu/doi/10.1086/5876
https://www.ncbi.nlm.nih.gov/pubmed/14711425
https://agupubs.onlinelibrary.....wiley.com/doi/full/1
https://www.ncbi.nlm.nih.gov/pubmed/1684053
https://agupubs.onlinelibrary.....wiley.com/doi/pdf/10
https://volcanoes.usgs.gov/vol....canoes/yellowstone/y
https://www.floridamuseum.ufl.....edu/files/1013/9447/
https://peerj.com/articles/4880/
http://journals.plos.org/ploso....ne/article?id=10.137
https://www.scientificamerican.....com/article/the-sec
https://link.springer.com/arti....cle/10.1007/s00445-0
https://pubs.er.usgs.gov/publication/70117448
https://www.frontiersin.org/articles/120148
https://www.researchgate.net/p....ublication/280296629
http://volcano.oregonstate.edu..../columbia-river-floo
https://www.researchgate.net/p....ublication/298429576
https://pubs.geoscienceworld.o....rg/gsa/gsabulletin/a
Mustoe, George. “Washington’s Fossil Forests.” 2001
http://www.dnr.wa.gov/Publicat....ions/ger_washington_

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Sea scorpions thrived for 200 million years, coming in a wide variety of shapes and sizes. Over time, they developed a number of adaptations--from crushing claws to flattened tails for swimming. And some of them adapted by getting so big that they still hold the record as the largest arthropods of all time.

Thank you to these paleoartists for allowing us to use their wonderful illustrations:
Franz Anthony: https://252mya.com/gallery/franz-anthony
Ceri Thomas: http://alphynix.tumblr.com/
Lucas Lima: https://252mya.com/gallery/lucas-lima
Julio Lacerda: https://252mya.com/gallery/julio-lacerda
Nobu Tamura: https://spinops.blogspot.com/


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