jessevanhout Posted May 15, 2017 Share Posted May 15, 2017 Link to comment Share on other sites More sharing options...
Ludwigia Posted May 15, 2017 Share Posted May 15, 2017 It's a rock with an interesting shape. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Fossildude19 Posted May 15, 2017 Share Posted May 15, 2017 Looks like a eroded chert nodule, to me. 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...
FossilDAWG Posted May 16, 2017 Share Posted May 16, 2017 Perhaps just a chert nodule, as Tim suggested. However the radial structure in the middle suggests some possible organic origin to me. However the specimen is so worn it would be hard to say what it is exactly without cutting/polishing sections to see the internal structure. Two possibilities come to mind, some sort of a sponge or a single segment of a siphuncle of an actinocerid nautiloid. Either are possible if the specimen is from glacial drift, as both type of fossils occur in Ordovician and Silurian formations to your north, and so they could have been transported by glaciers. Of course, the specimen could also just be an intersting looking chert nodule. Don 2 Link to comment Share on other sites More sharing options...
TqB Posted May 16, 2017 Share Posted May 16, 2017 I agree with Don. The radial structure definitely looks like something and sponge is my first guess. Actinocerid siphuncle is an attractive possibility. Tarquin Link to comment Share on other sites More sharing options...
abyssunder Posted May 16, 2017 Share Posted May 16, 2017 (edited) This picture reminds me of echinoderms. I'm wondering if it couldn't be a cystoid (or crinoid) calyx. Edited May 16, 2017 by abyssunder " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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