Jump to content

Recommended Posts

Tidgy's Dad
6 hours ago, TqB said:

Thank you! That's very helpful, and confirms the usual advice that 0.5-1.0 is generally the awkward range, apart from some odd but identifiable small tabulates. :)

I'm glad this is of some use to some people :raindance:

Certainly makes it worthwhile and hopefully will prove valuable to collectors in the future 

Convergent evolution is wonderful and fascinating, but sometimes makes life difficult as to ids! 

Share this post


Link to post
Share on other sites
Tidgy's Dad

5. Batostomella maniformis. 

 

Accounting for 4% of the bryozoans in the Much Wenlock Limestone, Batostomella maniformis would have looked quite weird and wonderful. 

It is said to be a roundish basal disc with many branches rising up from it. The disc may be 3 cm wide and each branch is only 1 to 1.5 mm in diameter but up to 25 mm long. They branch at acute angles. The zooaria narrow through the exozone (outer part of the branch) to a tiny and largely concealed opening, so the outer surface appears smooth except for the occasional spine bases marking the positions of acanthopores (hollow spines). 

Simply put, the fossils you find are tiny, smooth sticks, usually in matrix pieces as they are very fragile.  

Notice the sharp angle of branching and the little spine bases that are often not visible or eroded smooth. 

0.jpg.d386a447296a710a2e919c7de7e8cf68.jpg

 

0b.jpg.503339beee214d9fd2cb6a4012b81509.jpg

0c.jpg.4302be02bb067c0e2f9464b089898a51.jpg

0d.jpg.1c155d0d50ac5a787cc7260a9e9768b3.jpg

0e.jpg.c87c935c4a22cd4636381af17ce5446a.jpg

0f.jpg.75b65e037a6d161231acf10ccc37eb28.jpg

This one shows a mix of different bits, but I think it's Batostomella maniformis with spine bases showing near the bottom between other objects. They can be very difficult to spot. 

0h.jpg.df6b196a27984ba3256634b7f81f5e71.jpg

Share this post


Link to post
Share on other sites
Tidgy's Dad

6. Stenopora primaeva.

 

4% of the bryozoans found, but they may seem like more as they are quite large and solid, but can sometimes be ignored as they are smooth and look eroded and are a bit like worn horn corals, too. 

In some respects, Stenopora primaeva is similar to Batostomella maniformis in being smooth, ramose and having tiny spines but in this case marking the position of large acanthopores. But it is much bigger, with stems being from 2.5 to 4 mm in diameter. It is also moniliform in shape giving it a beaded or rather blobby appearance. 

0a.thumb.jpg.f8d3659cfcbee6060e5313c512f14a1a.jpg

0.thumb.jpg.7f5d92e8146cbe7793cbc938d9842fbd.jpg

0b.thumb.jpg.b5524ff048961ec28f4fc25547c5ae35.jpg

0c.thumb.jpg.aada213783817b8bda0f67145ebb55e0.jpg

0d.thumb.jpg.7874a23959de781f48da7847f238f8c1.jpg

0g.thumb.jpg.ac4277ec038acc28a20798d9978a298d.jpg

0h.thumb.jpg.d600aecb845f1b3c5790daba51340be0.jpg

0i.thumb.jpg.548e4ff2ee0c0ecffa01e1358f42c136.jpg

0k.thumb.jpg.680c991856651c3d520b87591affc860.jpg

I think these may be eroded specimens, but I'm far from certain.0w.thumb.jpg.e5d2b4aceab1cc4d423489709da5b64b.jpg

0x.thumb.jpg.0ad4813659e8d4c2d6c2590caeba2f27.jpg

0y.thumb.jpg.1ed825d8f19e9439477ae8232cf6d2a3.jpg

 

 

Share this post


Link to post
Share on other sites
Bobby Rico

Wow this thread has move on a bit. I love the last page Wren's Nest material been a few years since I have bern there. Nice to catch up on this thread. Cheers Bobby 

Share this post


Link to post
Share on other sites
Tidgy's Dad
6 hours ago, Bobby Rico said:

Wow this thread has move on a bit. I love the last page Wren's Nest material been a few years since I have bern there. Nice to catch up on this thread. Cheers Bobby 

Thanks, Bobby, glad you found the thread again and enjoyed it. :)

Lots of Wren's Nest material to come! 

Share this post


Link to post
Share on other sites
Tidgy's Dad

7. Asperopora multispora

 

Also accounting for 4% of the bryozoans in the Much Wenlock Limestone Formation is Asperopora multispora. There are three species of Asperopora in this formation, and they used to be listed under the genus Lioclema. So a lot of the information on this species was found by searching for Leioclema multisporum. 

Asperopora multispora is an encrusting species which can be told apart from Fistulipora nummulina by it's more widely spaced zooecia, which are often more petaloid in shape due to the presence of acanthopores (hollows that mark the base of small hollow spines), and the presence of numerous mesopores (smaller apertures in between the larger openings of the zooecia). It is often found encrusting brachiopods and crinoids as well as ramose tabulates and bryozoa.   

This one's on a fellow bryozoan; Hallopora elegantula. You can see it at the bottom, creeping around from the other side........... 

0a.thumb.jpg.c6d2c9b1630dfbfdc34b94f1a1aa38c7.jpg

..........which it completely covers, you can only see two or three of the hosts zooecia peeking out toward the left end of the specimen :

0.thumb.jpg.cb421cb0d445ccb0703af144257c0303.jpg

The host specimen is 9 mm in length. 

A close-up. The mesopores between the main zooecia are not always as clear as this :

0b.thumb.jpg.19936a12865397591adc16e0187b63c8.jpg

Here's an A. multispora colony creeping over the end of another Hallopora: 

1z.jpg.fb310c963d2a0d8cd3efa16ed3bdfa2b.jpg

This one's on an Eridotrypa cava bryozoan:

0c.thumb.jpg.311e820a427cf1f775e583fcc623d199.jpg

On a section of crinoid stem, diameter of stem 9 mm.

1a.thumb.jpg.8e05b95bb8056f93df62dbb2d3d3671b.jpg

1b.thumb.jpg.1488a148ef1f3b3ab885a962f6d00304.jpg

This one's on a favositid coral:

1f.thumb.jpg.e8f605def2fbcd9b24e8704e2ddf8e7b.jpg

1g.thumb.jpg.9b165bf4162d443d22d885fdca5e94b6.jpg

And in nearer. It's not so clear as it's been a bit battered and eroded.

1h.thumb.jpg.1331e3399043bfbc88edb9591171e010.jpg

The little ramose tabulate coral Coenites striatopora :

1l.thumb.jpg.fb37d7f9516a2e7c3c8907d516033e09.jpg

And encrusting the other side of it :

1m.thumb.jpg.eac84f88f9da9f1d29bea3be18e2add8.jpg

 One supposes it killed some of the organisms in the corals and bryozoans it covered unless this happened post mortem. Smothered the poor things. 

Another Asperopora multispora encrusting a Coenites striatpora :

1w.jpg.076b2679d2f8997f5b7212e3e0a83191.jpg

1x.jpg.c7a1bcc60839cea489b31c189754e9cd.jpg

1y.jpg.67e9472b2bbd0b7d4fe3631711809265.jpg

Here's one on an Atrypa reticularis brachiopod :

0brach.thumb.jpg.1c9929b1a869d3b3273a96cbcb2a32dc.jpg

 

 

 

Share this post


Link to post
Share on other sites
Tidgy's Dad

8. Asperopora aspera.

 

This second species of Asperopora accounts for 3% of the bryozoans found in the Much Wenlock Limestone Formation. 

Asperopora aspera is similar to A. multispora, but is usually found in a massive, often layered form, or as an encruster on the substrate or larger corals. It can reach a little over 10 cm in diameter, but most are only about a cm or two. It has larger petalloid zooecia and larger acanthopores marking the bases of spines that are usually only preserved in unworn specimens. There are fewer mesopores between the zooecia. 

These don't seem to weather free, so you find them on actual rock pieces which are pretty much always 'hash plates' at the Much Wenlock Limestone.

Some of these are from my own collecting days in Forest of Dean, along the Wenlock Edge and in the Malvern Hills, but others are from @JohnBrewerand @thelivingdead531 from the Wren's Nest. So, thanks again, friends! :b_love1:

All about 1 to 2 cm across. 

A nice little Platyceras haliotis gastropod here as well as a bit of crinoid stem :)

0b.jpg.520f1df69b3c7adbd60921a91741b9ca.jpg

Lots going on here, too. Crinoid columnals and a fragment of a fenestellid : 

0c.jpg.bbc1d761be0b5c415748d11d907b5f45.jpg

Close up of the details of various specimens:

0e.jpg.9db4bf8f80bb25dae3caabaa9b1f625f.jpg

0f.jpg.d5df95f374583fa3a6a702d4a0416aa0.jpg

0d.jpg.1c2537136df17ba7dd88f9a3f1da8172.jpg

Another specimen in close up : 

0.thumb.jpg.31cfc433e3d834a80e62faf57b5d2493.jpg

0a.thumb.jpg.2761556e47639b0f7e3a529966180d86.jpg

This one's less than a cm across. 

0g.thumb.jpg.2c59561ec34d6da35daf102fda2b7ff0.jpg

Not sure if this is one. It looks to be rather small next to this fenestellid. 

0h.thumb.jpg.977d356d9df33e611af301b249b01c0a.jpg

 

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×