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Showing results for tags 'mesabi iron range'.
Found 3 results
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Help identifying rock found in old iron mine waste rock.
Irongiant97 posted a topic in Rocks & Minerals
So I don't know what this is and would like to see if anyone here can help identify it or give me some idea of what it is. The picture isn't the best, nor could I fit a second picture into the main post so I'll add more in the comments, and I'll also try to describe it. It's made up of swirling, mixed, and radiating colors, red, yellow, orange, white, gray, and green (the flash from my phone has effected the colors in the picture a bit). It seems to be somewhat translucent, and has a sort of dry luster to it, not rough like most rocks, but not quite oily smooth like an agate. It's fairly heavy for it's size (from top to bottom it's about 4.5" long). I haven't tested how hard it is, and I don't know how to identify cleavage. I found it in the waste rock pile (mine dump) of a local iron mine on the Mesabi iron range in minnesota. Hopefully my description is helpful, I really want to know what this is because I think it's just so cool, and know where to find more.
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So I this rock out in the woods on the mesabi iron range in northern minnesota. It struck my eye when I saw a part of it sticking out of the ground, it's partially translucent olive green with lighter green bands going horizontally. The bottom side is a rough red and brown, very much like the outer crust of a raw lake superior agate. I don't know what it is, but it's pretty heavy for it's size (it's about 8.5" from end to end). My guess is that it's some kind of chalcedony like chert or possibly (hopefully!) an agate (though agates this size are rare, and green ones are rare in general) given how it's partially translucent, banded, high weight-to-size, and with a somewhat greasy luster. What do you guys think.
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Fossil Fishes of the Late Cretaceous Coleraine Formation, Mesabi Iron Range, Minnesota
Oxytropidoceras posted a topic in Fossil News
A re-examination of the fossil evidence for the presence of fish species within the Late Cretaceous Coleraine Formation of Minnesota's Mesabi Iron Range by John Wesygaard and others https://gsa.confex.com/gsa/2020NC/meetingapp.cgi/Paper/348239 More videos of related talks at: https://gsa.confex.com/gsa/2020NC/meetingapp.cgi/Session/50684 Hill Annex Mine Fossil Gallery http://rylanbachman.com/hillannex/ Stratigraphy and Paleontology of Mid-Cretaceous Rocks in Minnesota and Contiguous Areas By William A. Cobban and E. A. Merewether https://pubs.er.usgs.gov/publication/pp1253 https://pubs.usgs.gov/pp/1253/report.pdf The Cretaceous System in Minnesota (RI-05) by Robert E. Sloan 1964 https://conservancy.umn.edu/handle/11299/60189 Yours, Paul H.-
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- coleraine formation
- cretaceous
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