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LMcgunnigle
0B96679B-CA7E-4903-A5F7-8E70335202D2.jpeg  2E203119-5140-4F95-880C-C743628437C1.jpeg  0CEE15FD-5059-406B-8EE8-675A0D49FB5E.jpeg  New to this but my son is fascinated by fossils. We found this on the lower slopes of goatfell on the Isle of Arran, Scotland. Unsure if it’s anything but promised my son that I’d find out. It has the line all around but seems to have symmetrical hollows on either side of the line-4 of them, a bit tricky to see on my camera. Any help appreciated 0C276244-5D03-4E2C-B064-D9D84C6124C4.jpeg  0E8C4F0A-D8D2-4C98-B2C6-ADD537FC77C4.jpeg  AE5736BB-EDFF-41AE-8320-A6A0C6847022.jpeg  7B5B37EC-4FA6-4182-B90D-CA56772D778E.jpeg 
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Brittle Star
I am not sure as not familiar with that area, could be worn septarian nodule, although the lines are straighter than I would expect. Taking a photo with a ruler for scale also photos of the different sides would help.
JW

 Never ask a star fish for directions
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LMcgunnigle
Further photos added 
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Dirty Pete
Hi LM,
You're on or next to a large granite intrusion up there and that bit of rock looks metamorphic. Maybe Hornfels with a metamorphic mineral vein running through it.
Pretty sure it's not an animal.

Pete 
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LMcgunnigle
B185C474-4F42-433C-99B9-CD9DAFAD78D2.jpeg  5576A659-1F54-4C0F-9189-39AC4BDC723F.jpeg  2D011087-12A0-4C04-9D63-2F4034FF44EC.jpeg  AE85C7ED-1E42-4656-BA3F-9AEB9C67F1B8.jpeg 
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Dirty Pete
I'm sticking with metamorphic.......
Pete
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LMcgunnigle
Dirty Pete wrote:
I'm sticking with metamorphic.......
Pete


thanks, agree it definitely looks like hornfell with metamorphic vein, however the 4 symmetrical indents on each side of the line had me wondering? 
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prep01
Hello and welcome to the forum. I am not famimiliar with Arran either, but I think it might be Archaeological / mineral. I would suggest taking it to a museum.
Colin Huller
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Dirty Pete
Hi again LM
I think your indents are the result of tighter fractures crossing the main vertical fracture at 90 degrees resulting in a concentration of mineral deposition at the intersections. 

Pete.
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