Trilobites from Wales ID required

[DatFossilBoy]

Hello all,

 

Today I found many trilobites from a locality called Gilwern quarry in Wales

They are from the Ordovician period.

Here are 2 of my best finds. I would love to get an ID on them! The complete one (~2cm) I don’t know what it could be , the second one (just the head) ~1cm is probably Trinucleid?

Kind regards Thomas

[Misha]

Can't help with IDs but these are really cool! Don't often see Welsh fossils, especially Ordovician 

[Kane]

Compare the asaphid to Ogyginus corndensis

 

Image from 

Levi-Setti, R. (2014) The Trilobite Book: A Visual Journey. Univ. of Chicago Press: Chicago, p. 165.

[DatFossilBoy]

17 minutes ago, Kane said:

Compare the asaphid to Ogyginus corndensis

 

Image from 

Levi-Setti, R. (2014) The Trilobite Book: A Visual Journey. Univ. of Chicago Press: Chicago, p. 165.

Awesome! I definitely think this is a solid match!

[JesseKoz]

Very cool finds, thanks for sharing! Having a quick hunt myself, I agree with Kane, looks like the pygidium segment count lines up for Ogyginus corndensis. And the other I agree with Trinucleid being likely, possibly Trinucleid abruptus? 

 

I had a look at https://www.asoldasthehills.org/Trilobites.html for some diagrams of Welsh trilobites. 

[Kmcnalley]

30 minutes ago, Kane said:

Compare the asaphid to Ogyginus corndensis

 

Image from 

Levi-Setti, R. (2014) The Trilobite Book: A Visual Journey. Univ. of Chicago Press: Chicago, p. 165.

I've been collecting trilobites from the southern Ontario area for some time now and I've been wondering, what are the morphological differences that distinguish Ogyginus corndensis from Pseudogygites latimarginatus?

[Kane]

@Kmcnalley One of the more distinguishing features would be the shape and expansion of the glabella, as well as the broader cephalic brim and slender genal spines.
 

This image from the legend Ludvigsen:

 

Ludvigsen, R. (1979) The Ordovician Trilobite Pseudogygites Kobayashi in Eastern and Arctic North America. Life Sciences Contributions ROM 120

 

 

[piranha]

2 hours ago, JesseKoz said:

I agree with Trinucleid being likely, possibly Trinucleid abruptus?

 

I had a look at https://www.asoldasthehills.org/Trilobites.html for some diagrams of Welsh trilobites. 

 

 

The glabella of Trinucleus abruptus expands anteriorly with a different array of pits. A better match is Bettonolithus chamberlaini (=Bettonia)

 

 

Hughes, C.P. 1971

The Ordovician Trilobite Faunas of the Builth-Llandrindod Inlier, Central Wales. Part II.

Bulletin of the British Museum (Natural History) Geology Series, 20(4):115-182  LINK

 

[Yoda]

The first one does look like a Ogyginus

 

You don't get complete specimens on offer very often. The ones I have seen for sale are usually missing the head 

[Ludwigia]

I just googled "trilobites Gilwern quarry in Wales" and came up with this. Sometimes the search function works quite well.

[DatFossilBoy]

Thanks so much guys for the great help and the ID of both!

[Tidgy's Dad]

Nice finds! 

Cymru am byth! 

[DinoFossilsUK]

Nice finds, that site is packed with trilobites but most of them are partials - that whole Ogyginus is great!

[DatFossilBoy]

thanks guys, I was very lucky with this one!!  

[10jwashford]

Hiya, 

That trinucleid looks very similar to one I found at the same site (upper Gilwern quarry) a few months ago! 

I've come the the conclusion of mine being Salterolithus caractacii (I could be wrong though!) Yours does look very similar though, so it could be worth considering. 

I have attached pictures of the one I found there.

Edited March 8 by 10jwashford