28 Dec 2013

Segmented sessile lower Jurassic fossil (ID needed please...updated)

Alright, I'm stumped. (That's what you get when you lend your precious fossil field guides to a forgetful neighbour.) Our Boxing Day walk on Runswick beach turned up a some ammonites, a few bits of belemnites, a piece of jet and a couple of devil's toenails.And this, or rather these since it's obviously a colony of them:

Update; thanks to AndyS and Anon, it turns out they're geological artifacts not fossils. They are cone in cone structures, their origins a matter of debate. While not what I had hoped, finding them caused me (and Number One Field Assistant) some delight, I have learned something and will look at strange shapes in the rocks with a new, skeptical eye in future.



Any ideas, do leave a comment. And click over to Andy's Fossils. How have I not found this brilliant ammanoblog before? He's a proper collector who cracks open nodules and having found lovely fossils prepares them meticulously then writes about it all very well indeed. Go and see him. At once.

2 comments:

Anonymous said...

Peter,

Google for "cone-in-cone structure" and you'll find your "fossil"...

Best regards,
Andy (andysfossils.com)

Stu Pond said...

These are cone-on-cone structures and are the result of diagenitic processes and acre non-organic. Great example!