Runswick Fossil

[Mctapmonkey]

Hi, can anyone tell me what this is?

I picked it up at Runswick Bay on East Yorkshires Jurassic coast. The area yields ammonites, belemnites, crinoids and marine bivalves.

It is quite big, about a foot long, and superficialy looks like a fish fin with rays radiating out from a more substantial centre point.

Any sugestions would be welcome.

[TqB]

Hi, welcome to the forum. That's a piece of the ammonite Phylloceras heterophyllum - they can get very large!

Here's one on a very good Yorkshire ammonite (and other fossils) blog:

https://andysfossils.files.wordpress.com/2014/10/phylloceras2_s.jpg

Edited May 17, 2015 by TqB

[Mctapmonkey]

Thanks for the ID.

I have looked up Phylloceras Hetrophyllum on google now and it makes sense.

It must have been a big one.

I will now label it properly and leave it on display in the bathroom for my wife to dust.

Your reply has helped me a lot.

Thanks.