LegsBirchler Posted July 10, 2017 Share Posted July 10, 2017 Hi! I found what may be a large -4-ish concretion at a creek in Crawford County, In. It is different than what I have encountered before. Any thoughts on prep or whether it is worth digging into? Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 10, 2017 Share Posted July 10, 2017 Looks like a septarian concretion, to me. Regards, Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
ashcraft Posted July 10, 2017 Share Posted July 10, 2017 Looks like mud cracks to me. Some have attributed these to drying and cracking of microbial mats. Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
Miocene_Mason Posted July 10, 2017 Share Posted July 10, 2017 I'd say mud cracks as well, although septerian nodule is a possibility. What turns me off from that is if the outside eroded away leaving the inclusion, it would be a harder crystal. This looks like a softer rock. “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
Paololitico1972 Posted July 10, 2017 Share Posted July 10, 2017 Mud cracks!! Typically at the base of the sandstone layer (photo 3) Link to comment Share on other sites More sharing options...
Rockwood Posted July 10, 2017 Share Posted July 10, 2017 Split the difference. I suspect that elements of septarianism and desiccation may be involved here. 1 Link to comment Share on other sites More sharing options...
ynot Posted July 10, 2017 Share Posted July 10, 2017 Just to throw a wrench into the works. Septarian concretion / nodules are mud cracks. This piece looks like the type found at the dried out bed of a body of water. 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...
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