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valh

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Reply with quote  #1451 
Hi Curt! Superb specimen!
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Valerij
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CurtKnap

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Reply with quote  #1452 
Thanks Valerij!
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TqB

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Reply with quote  #1453 
Another interestingly mineralised Actinocyathus floriformis from the Great Limestone, Weardale. Found and cut this month.

Scale bar 1cm.

IMG_2552.jpg 

IMG_2551.jpg 

IMG_2553.jpg 





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Tarquin
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Hydrangea

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Reply with quote  #1454 

Another beauty Tarquin, excellent preparation and pictures (as always).

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Roy D.
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CurtKnap

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Reply with quote  #1455 
I'll second that, Roy - and beautiful mineralisation, as Tarquin notes.
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TqB

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Reply with quote  #1456 
Thanks, Roy & Curt - it's getting harder to find these in the dales, only partly my fault...[smile]
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Tarquin
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CurtKnap

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Reply with quote  #1457 
Here's a small (only 1cm or so in diameter) coral from the Brigantian of north Wales. It's probably a juvenile Dibunophyllum bipartitum, despite the superficial resemblance to Axophyllum.



IMG_2740.JPG 
IMG_2742.JPG

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Hydrangea

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Reply with quote  #1458 

Nice one Curt, great picture, interesting bluish halo around it.

regards.

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Roy D.
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Reply with quote  #1459 
Nice specimen, Curt, you're probably right. Dibunophyllum can be very misleading when the central dividing lamella isn't there.

Here are four consecutive sections, taken over about 2cm length, of what I'm calling D. bipartitum konincki (not that I like sub-species...) which does something similar for a while. The first section is the youngest and is "normal".
(There's a bit of a bluish silicified halo here too.)

IMG_2672.jpg 

IMG_2676.jpg 

IMG_2679.jpg 

IMG_2681.jpg


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Tarquin
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prep01

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Reply with quote  #1460 
You using a stacking prog now Tarquin?
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Colin Huller
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Reply with quote  #1461 
Quote:
Originally Posted by prep01
You using a stacking prog now Tarquin?


Not yet, Colin, but I want to. I just go to about f16 to get depth of field - OK with the camera mounted on a copy stand. 

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Tarquin
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CurtKnap

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Reply with quote  #1462 
Thanks Roy; as Tarquin notes, the halo is silicified.

Lovely sequence there, Tarquin. I see a distinct similarity between the specimen I posted and the middle couple of sections from yours. I have just a thin slice of matrix though; not really enough to section further. There does seem to be significant variation amongst 'D. bipartitum', so there have been several sub-species named, as you know...I've never been really convinced though.
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TqB

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Reply with quote  #1463 
I agree, they all join up I think.
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Tarquin
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Hydrangea

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Reply with quote  #1464 

Very nice specimen Tarquin, interesting to see the changes as the coral has grown. 

regards

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Roy D.
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valh

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Reply with quote  #1465 
Hi Tarquin! An interesting specimen!

dibunvar.jpgDibunophyllum осевые структуры.jpg 


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Valerij
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Reply with quote  #1466 
Roy & Valerij, thanks!

Valerij - good summary figure.

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Tarquin
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Reply with quote  #1467 
A green Aulophyllum fungites! - from the Great Limestone of Weardale, as found (photographed covered with water).

I'll section it later - the ones in this crinoidal limestone are usually very well preserved with transparent calcite infill. They're rare in this matrix but I keep a special look out for them.

IMG_2763.jpg 

IMG_2765.jpg 




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Tarquin
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Hydrangea

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Reply with quote  #1468 

Another nice one Tarquin. 
Do you think the copper staining is recent?
To me it looks like a woman's head and shoulder silhouette in that crinoid to the left of the coral!!

regards.

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Roy D.
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CurtKnap

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Reply with quote  #1469 
Looks a promising one, Tarquin; I look forward to seeing the section/s. This is a fascinating genus that I have only found a few examples of.

Roy - I see what you mean; looks like a coin!
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TqB

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Reply with quote  #1470 
Thanks, Curt & Roy. I completely agree about the crinoid bit, hadn't noticed!

Yes, the staining will be recent - it won't have been in the stream for more than a few decades and that's where all the stained ones are.

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Tarquin
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valh

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Reply with quote  #1471 
Hi Tarquin! A unique specimen! The green color of calcite can be caused by local manifestation of copper in this area.
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Valerij
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Reply with quote  #1472 
Thanks, Valerij, I believe you're right. There are many old lead mines in the area and small quantities of copper are present.
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Daniel

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Reply with quote  #1473 
Can anyone ID this? I found it on the Holderness coast yesterday.


Thanks,

Daniel

Attached Images
Click image for larger version - Name: 98681EAF-C0C3-498E-8B95-C059210C5F6E.jpeg, Views: 24, Size: 8.04 MB  Click image for larger version - Name: 7F4C01B3-F28E-413B-BBD8-23F42F361A3D.jpeg, Views: 25, Size: 4.69 MB 

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CurtKnap

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Reply with quote  #1474 
Hi Daniel,

That's a nice colony showing the calicular surface. It's probably an Actinocyathus sp. - look at examples of this genus earlier on this thread (needs a section to be sure).

Great find, by the way; Roy ('Hydrangea') has collected a lot of Carboniferous erratic material from the Holderness coast, with some fine examples posted on this thread.

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Daniel

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Reply with quote  #1475 
Thanks for your help
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Hydrangea

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Reply with quote  #1476 

A very good find Daniel, you'll have to try polishing it.

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Roy D.
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Daniel

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Reply with quote  #1477 
Thanks.
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CurtKnap

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Reply with quote  #1478 
Here's my rarest coral find from 2017, a very worn beach cobble from East Lothian: my first and only specimen of Thysanophyllum orientale.

The matrix is a very pale limestone and the preservation makes it difficult to photograph, but it's rarity makes it worth posting. I have not actually sectioned it, but just ground down flattish faces of the cobble. The whole thing is about 85mm x 65mm, with the largest corallites about 20mm in diameter.

Natural appearance showing transverse sections of corallites:
1a.jpg 

Contrast enhanced and with 1cm scale:
1b.jpg 

Close-ups:
3b.jpg 
5b.jpg 
6b.jpg 

Partial longitudinal sections:
7b.jpg  8b.jpg  9b.jpg 



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Hydrangea

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Reply with quote  #1479 

A nice find Curt and well prepped! Beautiful!

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Roy D.
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CurtKnap

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Reply with quote  #1480 
Thanks, Roy!
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TqB

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Reply with quote  #1481 
Excellent find and very attractive, Curt. One I've not seen apart from in Dorothy's monograph. 😉
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Tarquin
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prep01

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Reply with quote  #1482 
Aestheticall loverly!
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Colin Huller
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CurtKnap

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Reply with quote  #1483 
Thanks gents. It's the only one I've ever seen outside the monograph too, Tarquin.
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CurtKnap

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Reply with quote  #1484 
Admin - I'm surprised the last post from DumaFossil (#1483) on this Carboniferous Corals thread got through the current vetting process. Could it please be removed? Thanks.
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CurtKnap

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Reply with quote  #1485 
For various reasons, I've not been out collecting as much as usual this year. However, here's my best Carboniferous coral find of 2018 (found in February). It's a Brigantian Orionastraea (probably phillipsi) from north Wales.

Orionastraea phillipsi 1.jpg 
Orionastraea phillipsi 2.jpg 
Orionastraea phillipsi 3.jpg 
Orionastraea phillipsi 4.jpg 
Orionastraea phillipsi 5.jpg 

There's also a nice little bryozoan on the coral (down near the bottom centre in the first pic):
Orionastraea phillipsi + bryozoan.jpg 

Happy New Year everyone.


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TqB

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Reply with quote  #1486 
Magnificent specimen, Curt, looks fresh from the sea!
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Tarquin
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CurtKnap

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Reply with quote  #1487 
Thanks Tarquin; I was very pleased with this one. As you know, it's rare to find Orionastraea at all, let alone with such a clean calicular surface.
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valh

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Reply with quote  #1488 
Happy New Year, Curt!  Very good tamnasteroid!
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valh

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Reply with quote  #1489 
Happy New Year everyone!
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Reply with quote  #1490 
Happy New Year to you too, Valerij!
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