Lava, Ice, and Ancient Seas: How Michigan Got Its Pictured Rocks

In Munising, Michigan, more than a dozen miles of rainbow, painted cliffs make up Pictured Rocks National Lakeshore. Hundreds of thousands of people visit each year, but very few learn the epic, billion-year-long story behind them. It's a story that involves everything from lava, to ancient highlands, to long-forgotten sea creatures, to mile-high glaciers and an ancestral Great Lake.

So, let's take a journey back in time. Here's what the Earth was like hundreds of millions of years ago, back when these famous cliffs were just getting started.

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Key Sources:
Some awesome overviews of Pictured Rocks geology:
https://www.nps.gov/piro/learn/nature/geologicformations.htm
https://www.nps.gov/piro/learn/nature/loader.cfm?csModule=security/getfile&PageID=3031804
https://www.michigan.gov/documents/deq/GIMDL-GSA87D_302406_7.pdf
https://www.usgs.gov/science-support/osqi/yes/national-parks/pictured-rocks-national-lakeshore

A long read, but a great book on the geology of the area: https://books.google.com/books?hl=en&lr=&id=Z9k2801hXscC&oi=fnd&pg=PP1&dq=pictured+rocks&ots=w_ck9Smp5Y&sig=79UDMj907eTb79x0Z0HJqatQUVY#v=onepage&q=pictured%20rocks&f=false

#PicturedRocks #UpperPeninsula

Midcontinent Rift/Jacobsville:
https://eos.org/features/new-insights-into-north-americas-midcontinent-rift
https://www.nps.gov/articles/parkscience32_1_19-29_stein_et_al_3817.htm
http://www.geo.mtu.edu/KeweenawGeoheritage/Sandstone/Sandstone/Welcome.html

Miners Castle/Chapel Rock:
https://naturalhistory.si.edu/education/teaching-resources/life-science/early-life-earth-animal-origins

Key Image Sources:
Old Maps: https://www.earthbyte.org/paleomap-paleoatlas-for-gplates/
Paleoart: http://spinops.blogspot.com/
Chapel Rock Ripples: VOICE, P.J. & HARRISON, W.B., III (2014) Paleozoic Geology of the Central Upper Peninsula of Michigan. Michigan Basin Geological Society and Michigan Geological Survey, 111 p.

Видео Lava, Ice, and Ancient Seas: How Michigan Got Its Pictured Rocks канала Alexis Dahl