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RobertM5
Just come back from fishing at Llandegvedd Reservoir. I am sure it is mostly Silurian there is a formation of bedding planes in the Strata but found something a bit different there appeared to be Devil's Toe Nails in some and also of some coral Photo's attached. It is the belemnite type nodule I recovered I am uncertain of?? Any ideas? Click image for larger version - Name: IMG_20181016_145940.jpg, Views: 37, Size: 2.29 MB Click image for larger version - Name: IMG_20181016_150433.jpg, Views: 40, Size: 2.59 MB Click image for larger version - Name: IMG_20181016_150015.jpg, Views: 39, Size: 2.57 MB Click image for larger version - Name: IMG-20181016-WA0001.jpeg, Views: 43, Size: 1.38 MB Click image for larger version - Name: IMG_20181016_145953.jpg, Views: 38, Size: 3.43 MB
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MicroFossilMan
That's a rather nice chain coral. Halysites perhaps?

If there were Devil's Toe Nails (Gryphaea sp.) then I suspect they're in rock that was brought in from somewhere else. The bedrock in the area is, as you suspect, Silurian and Gryphaea doesn't go that far back.
MFM
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prep01
I agree with MFM on the coral and the nodule looks more Jurassic. No photo of the Gryphaea?
Colin Huller
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RobertM5
I got the samples while fishing, the summer as it was the fossils have not been exposed for over 40 years.
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RobertM5
prep01 wrote:
I agree with MFM on the coral and the nodule looks more Jurassic. No photo of the Gryphaea?
I might venture out again tomorrow, see if I can get some photos
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Dirty Pete
Hi Robert, I've spent many hours wandering around the Usk inlier without much success. Found a trilobite many years ago but never a Gryphea.
Here's a geology map of the area. The inlier's surrounded by Devonian so definitely no Jurassic.  

USK geolmap.jpg 
Pete.

PS I've found Gryphea stuck in the banks of the Mon-Brec canal around Blorenge which is cut in Devonian rocks. They used impermeable
Lias clays to line the canal. Obviously the Gryphea came along with the clay. Maybe a similar thing at the reservoir. 

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