Jdeutsch Posted October 22, 2016 Share Posted October 22, 2016 I collected this in a canyon in the Black hills of Eastern Wyoming. I don't usually think of fossils in that region, but there happened to be a limestone column with some brachiopods about a half mile from where this rock was found, suggesting a marine environment for some of the rocks in the area. I can't tell which geologic strata I was in, as things change quickly in the Black Hills http://pubs.usgs.gov/sim/2777/downloads/2777_sheet1.pdf , and there is material washing down the canyons all the time. This was in a dry creek bed. approximately 20 cm across, 10 cm wide and 10 cm thick Link to comment Share on other sites More sharing options...
ynot Posted October 22, 2016 Share Posted October 22, 2016 I see a geologic not a fossil. It could be an agate that formed around other minerals that have eroded out. Tony Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
supertramp Posted October 22, 2016 Share Posted October 22, 2016 something like boxwork? https://www.google.it/search?q=boxwork&biw=1280&bih=685&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiPwp2nme_PAhXGuRoKHS3BB_IQ_AUICCgB ciao 2 Link to comment Share on other sites More sharing options...
Jdeutsch Posted October 23, 2016 Author Share Posted October 23, 2016 Boxwork is very reasonable, as I've found and collected it in the same canyon where cliffs collapse and expose pockets. See image. The boxwork collected was much more fragile than the specimen which started the thread, but is certainly has similarities Link to comment Share on other sites More sharing options...
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