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McFossil
Can anyone help identify this? Sorry,  poor images as it was taken in a cave with a wet waterproof camera.  Lots of fossils there,  but this was the most complete.  Looks like 4 limbs and a tail. We thought there were impressions of feathers around the skeleton. Any ideas?
P1060596.jpg  P1060593.jpg P1060595.jpg
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Dirty Pete
Hi McFossil,

I have no idea what I'm supposed to be looking at, however I think most caves in the UK are associated with the Carboniferous Limestone, these rocks are around 350 million years old, birds are thought to have evolved from small carnivorous dinosaurs in the late Jurassic around 150 million years ago. If this is indeed a Carboniferous limestone cave I see a problem with your hypothesis.

Cheers
Pete 
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McFossil
There were several things that looked like vertebrate skeletons and bones (see possible bone below).  No idea about the type of rock, very black. There were also shells (see below) in the walls. 


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Dirty Pete
Hi McFossil,
Where is the cave, that would probably be enough to figure out the rock age.
Pete
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McFossil
Off the N. Pembroke coast near porthgain


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Anonymous
Lingula Flags Formation Ordovician rocks at Porthgain, of around 470 million years old, so no birds and mostly marine organisms. 
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McFossil
Oh, weird, the things we saw looked so clearly vertebrate,  I wonder what they were? I'm not a fossil hunter,  just fascinated to see these things in the cave. I know a bit of anatomy and thought I saw limb bones in the right orientation for 4 limbs and articulated vertebrae but clearly not. I saw the rock was in tilted layers so thought sedimentary but I'm afraid I'm ignorant of geology so thanks for the info!


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Dirty Pete
That would make the bedrock 450 million years old (Ordovician). There's no significant limestone layers as far as I know, just mudstone, sandstone and igneous rocks.
If you are convinced there are articulated bones/skeletons then maybe its a more recent cave deposit where bones of animals have been washed into the cave and deposited.
Pete
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Dirty Pete
Seems to be random delays in the posts/replies showing up on the thread.....frustrating ........Admin? 

A cave deposit would be more like layered infill and not aligned with the bed rock. I can't think of any Ordovician fossils that could be confused with articulated vertebrates. If a skeleton is in the bedrock, whatever you do don't tell Mr Cremo about this.

Pete
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McFossil
I don't think so,  the cave is in an island off the coast and the smooth black rock extends to the roof. The strata are vertical and the nextdoor cave seemed to be in a reddish ?sandstone layer. I think We must have just misinterpreted the"skeleton" Attached is a picture of the cave mouth. 


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McFossil
 Thanks for your help!


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Dirty Pete
Very nice. Sea cave created at a weak spot, fault/shear zone or similar. Shame about the Ordovician skeleton, it would have made you famous.

As a last thought could it have been a jumble of crinoid bits and pieces??

Pete
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