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I found this a few years ago in west Dorset and unfortunately I cant remember where but possibly Charmouth.
I have no idea what it is, my son reckons they look like fish fins but a small piece broke of and revealed a little more inside.  There is a lot more in the area on the bottom right of the first photo as you can see little bits poking out around the edge but I think it would probably be destroyed if I tried to expose it.  Hope you can help.
Thanks RichIMG_6212.jpg  IMG_6213.jpg  IMG_6214.jpg  IMG_6215.jpg   
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Barrow Museum
These are fossil bivalve shells.  I was searching for a completely exposed example, but couldn't find one in the photos.  The reason is that the hinge line is quite an important feature for identification - did it have "wings" for example?  At the moment, the closest species I can compare it with is Nanogyra virgula, (sometimes called Exogyra virgula) a thin-shelled oyster which is found principally in the lower part of the Kimmeridge Clay Formation.  Is it possible you visited one of these localities, a little further east in Dorset, such as Kimmeridge Bay?  The rock certainly has that hard, shaly appearance that I would associate with this location.  There's an illustration of one from hte Dorset coast here: (scroll about 40% down the page).

There is a species of Nanogyra found in the Lower Jurassic (eg Charmouth), but it doesn't possess the fine radial ribbing that your specimens show.
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Hello, certainly shelly shale and I think I can see Oxytoma inequivalvis (or similar) of that genus and possibly a couple of valves of the bivalve Pinna lanceolata (forming that 'fish tail' imprint).
Colin Huller
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That's great thank you for taking the time to answer this.  There is a good chance this did come from Kimmeridge as I did go there when visiting my parents in Dorset.  I don't remember picking it up though.
Many Thanks
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