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Donald Burgess's avatar

When does the compilation/book come out?!

(Yep, I am so old I still think bound hard copy is cool.)

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Richard I Gibson's avatar

I like physical books too (around 3500 in my house) but I know what it takes to make one, so I wouldn't hold my breath :)

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Steve Sorrell's avatar

Congratulations on reaching the 100 mark!

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Steve Schoming's avatar

One hundred, with hundreds more to come...

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Bob Chesson's avatar

I find psuedomorphs crystals to be very intriguing. Makes you wonder at the unique geochemical conditions necessary for these replacement minerals to precipitate. Quartz after anhydrite is definitely an odd-ball situation. Great specimen BTW.

On the discussion of the Parana -Etendeka FBs. The trope that LIPS correlate strongly with extinction eevents doesn't seem to hold for the P-E basalts. Some researchers have focused on the rapid eruption duration of approximately 1 MY as a possible clue. That leads to other questions such as possible related climate perturbations or ocean chemistry changes which I don't think has evidential support at this time. Maybe the duration of the eruptions just was too short of a time-frame to leave obvious evidence. Another interesting puzzle that is beyond my expertise.

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Richard I Gibson's avatar

Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.

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Richard I Gibson's avatar

Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.

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Liz Fodi's avatar

Great synopsis

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