Mctapmonkey Posted August 5, 2017 Share Posted August 5, 2017 Can anyone help me with this one? Its from the beach at Ravenscar, North Yorkshire coast, The area produces ammonites, belemnites and lots of other marine invertibrates. I am guessing at some sort of fan worm. Link to comment Share on other sites More sharing options...
TqB Posted August 5, 2017 Share Posted August 5, 2017 Not a fossil I'm afraid but the interesting sedimentary structure called cone-in-cone. Plenty of info if you look it up. 4 Tarquin Link to comment Share on other sites More sharing options...
supertramp Posted August 5, 2017 Share Posted August 5, 2017 I agree with Tarquin, cone in cone structures https://www.google.it/search?q=cone+in+cone+structure&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj74q30hsDVAhUFJ8AKHaYeCKQQ_AUICigB&biw=1366&bih=638 Link to comment Share on other sites More sharing options...
Fossildude19 Posted August 5, 2017 Share Posted August 5, 2017 +1 for cone in cone structures. Neat looking, all the same. 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...
westcoast Posted August 5, 2017 Share Posted August 5, 2017 Yup. Cone in cone. diagenesis feature. Link to comment Share on other sites More sharing options...
doushantuo Posted August 5, 2017 Share Posted August 5, 2017 Steinheim c-in-c: Link to comment Share on other sites More sharing options...
doushantuo Posted August 5, 2017 Share Posted August 5, 2017 I did a quick check of Livera's thesis on the sedimentology of the Bajocian of Ravenscar: he doesn't mention cone in cone.However "Beef"/cone-in cone is found in the Jurassic of Yorkshire Link to comment Share on other sites More sharing options...
TqB Posted August 5, 2017 Share Posted August 5, 2017 7 minutes ago, doushantuo said: I did a quick check of Livera's thesis on the sedimentology of the Bajocian of Ravenscar: he doesn't mention cone in cone.However "Beef"/cone-in cone is found in the Jurassic of Yorkshire This is from the Toarcian shales, plenty of it there. 1 Tarquin Link to comment Share on other sites More sharing options...
doushantuo Posted August 5, 2017 Share Posted August 5, 2017 Is the apical angle between 70 and 110 degrees? Are they in horizontal beds? Are there stylolites? just making conversation,because these clearly ARE cone-in cones Link to comment Share on other sites More sharing options...
TqB Posted August 5, 2017 Share Posted August 5, 2017 7 minutes ago, doushantuo said: Is the apical angle between 70 and 110 degrees? Are they in horizontal beds? Are there stylolites? just making conversation,because these clearly ARE cone-in cones Horizontal beds yes, not sure about the others. Actually, it could be Sinemurian/Pliensbachian as well if it's from the Robin Hood's Bay side of Ravenscar. 1 Tarquin Link to comment Share on other sites More sharing options...
Mctapmonkey Posted August 5, 2017 Author Share Posted August 5, 2017 Link to comment Share on other sites More sharing options...
Mctapmonkey Posted August 5, 2017 Author Share Posted August 5, 2017 Thank you everyone, Yes, having googled cone in cone structure you are right. Not a fossil, but once again I have been educated and informed. TqB, you are spot on. This is from the Robin Hoods Bay side of Ravenscar. Link to comment Share on other sites More sharing options...
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