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Amyshep
Hello from a complete newbie! I found this rock yesterday in some old rail ballast close to my home in North West Leicestershire. I’ve never found a fossil before and really interested to know what it might be! Thank you in advance for any help in identifying my find. Amy 75B78D72-B91D-4E7D-AA25-86C3CFEA2032.jpeg 467B5179-B838-4AEB-83B7-D4C4318E3496.jpeg 767E1E71-6872-4A13-AEA6-C9F4C3752944.jpeg 834DF406-2424-43A3-B317-1F134E092901.jpeg
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Barrow Museum
It is a rugose coral which I suspect is in Carboniferous Limestone, as large quantities of this is quarried in the Mendip Hills for rail ballast.  This limestone was laid down in what was then a tropical sea some 350 million years ago, during the Carboniferous period of earth history.  There are experts on this forum who can probably give you its genus name.  My guess for its identity is Caninia sp, if that's still a valid name.
The flat, radial lineations remind me of the shell of a very large brachiopod, but the photo is too oblique to be sure.
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Amyshep
Thank you for your reply and for identifying the fossil, it’s so nice to know what it is/where it might be from.
I’ve attached another picture of the shell imprint.  Click image for larger version - Name: image.jpg, Views: 14, Size: 258.05 KB
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prep01
Hello Amy and welcome tothe forum. I agree with BM that the first couple of photos are of a rugose coral, and is probably Carboniferous in age (about 300 million years old, but it could have come from one of many locations! This type of fossil is known as a 'derived fossil'. Well spotted!
Colin Huller
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Amyshep
Thank you both I am really thrilled to have found it, unbelievable to hold something that is 300M years old! I’ll try to post another photograph of the shell imprint that’s on the side. 
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