Siliceous Sediments, Ironstones, and Phosphates (April 7 & 9)

Chert is not a big topic on the Web. Wikipedia’s article on chert is scholarly but short. An amateur has put together a very detailed page on flint and chert (and what may or may not be the differences between the two). The most important ironstones are the banded iron formations (BIF) that form the bulk of Michigan’s iron industry. Wikipedia’s page on banded iron formations is accurate and well-sourced. Nothing very exciting, but note that BIF includes chert. Phosphorites are less common on the Web. At least we can bring in the “Phosphorite War” in Estonia! Oh, and Peak Phosphorus is another future calamity you can now worry about. Otherwise I must say this is a rather boring week for our webpages. Good time to work on your research paper.

Banded Iron Formation specimen from Upper Michigan. (Click to enlarge.)

Geology in the News –

Last week a 6.5 magnitude earthquake shook Idaho and surrounding states. I bet you didn’t see this in the news. Earth processes continue, of course, with or without us.

NASA’s new internet and social media special, NASA at Home, will show and engage you in the agency’s discoveries, research, and exploration from around the world and across the universe – all from the comfort of your own home.

Speaking of NASA, check out this highest-resolution-yet image from the surface of Mars. Lots of sedimentary deposits to check out someday!

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