Found this rock, inside it looks like an animal fossil. Is this a fossil or just unusual markings?
I'm sure it is a fossil, but it is difficult to say much about about it from your photo/specimen.
It might be part of an ammonite, but we could do with seeing more (by picking away at the rock carefully, eg. with dental drill/picks).
With this sort of question, it is usually helpful if you tell us where the specimen came from, its size, if there were others in the area, whether you found it loose (on beach or in soil or in a scree) or in situ (then we'd want to know about the host rock), etc.
I found the rock on it's own, on the Jurassic coast in Dorset. Here are some more photos.
You have the makings of a fossil collector! well done.
You have taken a big step into fossiling by spotting a rock that is interesting and more than likley to contain a partial fossil.
I do-not want to get your hopes up but when i walk the beaches of the Holderness coast this is one of the signs i look for in the rocks on the beach, shape, colour, size, and many more factors come into play when fossil hunting.
I have attached a couple of images of an Androgynoceras sp ammonite, when it was found you could only see a bit of the outside whorle but when it was prepped the fossil was inside of the rock.
But sometimes the part of the fossil you see is all that remains and you are dissapointed - thats fossiling.
Thanks for the help, I have another fossil to id. I found it on the same beach near a cliff.
This is a belemnite guard (rostrum).
The external shape is quite characteristic, but the radial crystals seen in cross section make the ID definitive.