All along the east coast of the United States there are thousands of oval shaped pock marks, and scientists think they have a clue as to how they got there.
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Sources:
https://www.storyblocks.com/
https://www.gettyimages.com/
https://apps.nationalmap.gov/viewer/
https://www.usgs.gov/media/images/thermokarst-lakes-alaska
https://commons.wikimedia.org/wiki/File:CarolinaBays-USGS.JPG
https://earthobservatory.nasa.gov/images/147904/ice-age-carolinas
Bays
https://commons.wikimedia.org/wiki/File:WoodsBay_SC_hrdtm.jpg
https://commons.wikimedia.org/wiki/File:Robeso2.jpg
https://en.m.wikipedia.org/wiki/File:CarolinaBays-USGS.JPG
https://commons.wikimedia.org/wiki/File:Carolinabays.jpg
Pocosins
https://commons.wikimedia.org/wiki/File:Pocosin_Lakes_National_Wildlife_Refuge.jpg
https://commons.wikimedia.org/wiki/File:A_shot_of_a_pocosin_wetland_in_North_Carolina.jpg
Wildlife
https://commons.wikimedia.org/wiki/File:Wood_Stork_Everglades_National_Park_RWD.jpg
https://commons.wikimedia.org/wiki/File:WoodStorkWhole.JPG
https://commons.wikimedia.org/wiki/File:Ambystoma_cingulatum_USGS.jpg
https://commons.wikimedia.org/wiki/File:Frosted_Flatwoods_Salamander.jpg
Thermokarst Lake
https://commons.wikimedia.org/wiki/File:Permafrost_thaw_ponds_in_Hudson_Bay_Canada_near_Greenland.jpg
https://commons.wikimedia.org/wiki/File:Omulyakhskaya_and_Khromskaya_Bays,_Northern_Siberia.jpg
Sources
NATURALIST’S NOTEBOOK: CAROLINA BAYS: Another Man’s Treasure
http://archive-srel.uga.edu/outreach/factsheet/carolinabays.html
https://www.udel.edu/udaily/2021/december/carolina-bays-investigating-number-characteristics/
https://link.springer.com/chapter/10.1007/978-3-030-40498-7_2
https://www.usu.edu/geo/luminlab/whatis.html
https://www.baylor.edu/geosciences/index.php?id=955929
https://link.springer.com/content/pdf/10.1672/0277-5212(2003)023[0550:CBWUHO]2.0.CO;2.pdf
https://oceanservice.noaa.gov/facts/pocosin.html
Other Notes
https://repository.lib.ncsu.edu/bitstream/handle/1840.20/38657/Ford,%20Samuel%20final.pdf?sequence=1
https://artsandsciences.sc.edu/cege/resources/scmaps/manual/chap8.pdf