Below is an interesting open access paper.
Kenkmann, T., Sundell, K.A. and Cook, D., 2018. Evidence for a
large Paleozoic Impact Crater Strewn Field in the Rocky Mountains.
Scientific reports, 8(1), p.13246.
https://europepmc.org/articles/pmc6125292
https://www.nature.com/articles/s41598-018-31655-4/
Yours,
Paul H.
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