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KTC

At Charmouth last week I found some of the usual ammonites and belemnites, but also this rock which I am trying to identify.  

I don’t know if it’s just an interesting shaped rock (in which case I’d love to know about the process that causes these shapes to form)  or whether it could be a fossil of some sort.

It’s about the size of a cricket ball (tape measure in pics for scale) and the material is faintly glittery under lights. Any insight into what it is would be much appreciated (and if it’s just a rock I will continue using it  as a paperweight 😀

D23477AA-A2D0-44E3-B425-8AE9D1E12BD1.jpeg  A8BFD837-77AD-4817-87F7-94B5DF40A5C5.jpeg  2B66954F-91FD-4564-BE8F-34792B6A9EFE.jpeg  227F4AA4-4974-4B3C-A724-DEE16DEDE60B.jpeg  D67781BD-BEB0-451D-87F4-3ED8459B9DAD.jpeg 

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Dirty Pete
Hi,
Looks like a lump of fibrous calcite known locally as 'beef', seems like you've got some 'cone in cone' going on in the thicker layer too. 

Pete
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prep01
This looks like a 'banded' Oolitic nodule  and contains the 'wavy line' of a bivalve shell and a couple of eroded brachiopods on the bottom surface. I will try and annotate your photos in a couple of days. Oh, it's about 190 million years old!
Colin Huller
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Dirty Pete

Before you toss a coin check this PDF out.

https://reader.elsevier.com/reader/sd/pii/S2095383615300523?token=14CEF3918EBBA9DC012A4CA3FA67036F3D351183ECF567B7A184CD80AB65307244AEB1883AAF0AFFC15E8416E647BB1A
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KTC
Thanks both for your suggestions, I will do some reading.  It definitely looks to match the “cone in cone” description, that would make sense of the circular ridges!  
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KTC
And I've also learned that if you post a reply on an iphone, it'll tell you nothing's posted so you try again - and then you can't see that you actually posted your reply three times until you log in on a computer instead ðŸ˜„  Apologies for any excessive notifications!
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