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DickoSWD
Been searching Seaham's Blast beach today and found a couple of interesting items which I am not sure about.  Both are heavy due to their iron content. Any ideas? 20190225_143702.jpg  20190225_143645.jpg  20190225_144008.jpg  20190225_143955.jpg  20190225_143942.jpg  20190225_143922.jpg  20190225_143903.jpg
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DickoSWD
Images have not loaded in the correct order.  1, 2 and 7 are different shots of the same example. 

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Gandalf the White
Very odd, the first one looks like some tree bark on one side and the second looks like some type of Gastropod however both are very baffling and interesting.
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DickoSWD
Just been doing a bit research and the regular markings on the second image seem to correspond to the Lycopsid tree trunk bark.  Your right Gandalf  - the second example does seem to be some type of gastropod - or a fossilised bubble. 
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DickoSWD
Photo 2 bark pattern
https://www.alamy.com/stock-photo-fossil-lycopsid-tree-trunk-the-coal-ages-carboniferous-forests-exposed-70022726.html?pv=1&stamp=2&imageid=1C046C14-5FBB-48AB-B2DE-FA91B27EE2B6&p=214349&n=0&orientation=0&pn=1&searchtype=0&IsFromSearch=1&srch=foo%3dbar%26st%3d0%26pn%3d1%26ps%3d100%26sortby%3d2%26resultview%3dsortbyPopular%26npgs%3d0%26qt%3dtree%2520fossils%26qt_raw%3dtree%2520fossils%26lic%3d3%26mr%3d0%26pr%3d0%26ot%3d0%26creative%3d%26ag%3d0%26hc%3d0%26pc%3d%26blackwhite%3d%26cutout%3d%26tbar%3d1%26et%3d0x000000000000000000000%26vp%3d0%26loc%3d0%26imgt%3d0%26dtfr%3d%26dtto%3d%26size%3d0xFF%26archive%3d1%26groupid%3d%26pseudoid%3d%26a%3d%26cdid%3d%26cdsrt%3d%26name%3d%26qn%3d%26apalib%3d%26apalic%3d%26lightbox%3d%26gname%3d%26gtype%3d%26xstx%3d0%26simid%3d%26saveQry%3d%26editorial%3d1%26nu%3d%26t%3d%26edoptin%3d%26customgeoip%3d%26cap%3d1%26cbstore%3d1%26vd%3d0%26lb%3d%26fi%3d2%26edrf%3d%26ispremium%3d1%26flip%3d0%26pl%3d
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TqB
The lycopsid is form genus Syringodendron (Sigillaria minus bark). Nice find!
I think the "gastropod" is just a pyritic concretion.
Tarquin
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DickoSWD
Tarquin I have seen hundreds of pyrite concretions - especially along the Blast Beach at Seaham.  This is the first I have found one with such a pronounced curvature with a recessed centre.  Looks like a gastropod type(ish) structure, but I agree, it probably isn't.

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DickoSWD
Been doing a bit more research and located this example from the upper carboniferous.  It has similar characteristics as the curved CEP79_Michiganites_greeni_closer[1].jpg 
iron pyrites fossil I found.
 http://www.kyanageo.org/fossils/mississippian/mollusca/CEP79_Michiganites_greeni_closer.jpg
20190225_144008.jpg 

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