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Showing results for tags 'spiralia'.
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From the album: Lower Carboniferous fossils of Ireland
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From the album: Lower Carboniferous fossils of Ireland
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Exposed spiralia of spirifreid brachiopod
Brian James Maguire posted a gallery image in Carboniferous
From the album: Lower Carboniferous fossils of Ireland
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I'm not a brachiopod specialist by any means but have gradually acquired quite a few Carboniferous ones, both found and bought, and I'd like to start a thread for some of the more interesting (IMO) specimens that have hooked me into trying to learn more. The IDs are often traditional so I'd welcome any input from more knowledgeable folk such as Adam @Tidgy's Dad. As usual, detailed information is scattered around many journals. I'll start with a pair of Spirifer striatus recently acquired from an old collection. It's notable for its size, these being typical. The second partial specimen shows a crystal covered brachidium, rather broken up before mineralisation. Mississippian, probably Asbian Stage, Derbyshire, England The species is an old but valid one, Martin (1793), and these are from the same area as his type specimens. (There's a similarly large US species, S.logani, that I've been shown from the Keokuk Limestone of Missouri. I couldn't find any on the forum though.) specimen 2, with brachidium
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Meristella sp? Brachiopod showing spiralia.
Fossildude19 posted a gallery image in Member Collections
From the album: Fossildude's Lower Devonian Fossils
Brachiopod showing spiralia. Meristella sp.? (M. laevis?) Meristella lentiformis - Thank you, Adam. Lower Devonian Glenerie Limestone Tri-states group Glenerie, NY.© 2023 Tim Jones
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Been staying busy lately, but I had some spare time this weekend so I worked a stockpiled block of chert I had in the garage. I took this block home specifically because of the exposed partial brach sticking out of the hard chert. To reduce the size of the rock, I first split it in half which ended up being a lucky split as it didn't damage the brachiopod fossil or fracture the chert in a challenging way. After splitting the chert, I removed the steinkern from the rock and picked away the intact half of the shell not exposed with a sharp needle in hopes of some golden spirals. Easy to see which side was exposed from its rock tomb. Fortunately for me the half hidden inside the chert was complete, unfortunately though the half exposed from the chert was infilled and weathered away.
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I ended up going out yesterday for a good portion of the day to my favorite creek. I've collected so many treasures here now that I don't mind sharing my favorite creek now, and figured I would show how a normal stream can have more than meets the eye. Of course these fossils are by no means easy pickings, as it requires splitting large slabs of chert. This is the more risky way to collect the fossils as they are delicate steinkerns that can easily break. The chert can also fracture in dangerous ways so I always wear glasses when I split chert, and would be a blind man if I didn't! Well heres a shot of favorite creek, pretty boring looking right? It's a real treat this time, because the water level has never been so low when I've come here. Usually the water is about 4-5 foot high when I walk through this stream, but currently there is only a few inches of water in certain spots of the creek. That means there is a lot of rock I can look at that I've never layed my eyes on. You can see on the bottom left of the photo where I started work on the first chunk of chert. Taking photos is not my forte! It's hard to see (I thought it was a better photo when I was out fossil hunting) but this chunk has a nice brachiopod in the dead center I worked out. While it was nice to see so much exposed rock this time, the timing wasn't. The leaves falling from the trees ended up making my job more difficult as the leaf litter covered many rocks. As I was splitting chunks off the large slab to get to my brachiopod, I was very delighted to see a small associated sliver that had some coral and brach pieces embedded. From much experience, I used my pocket knife to removed some of the terebratulid brach's delicate (paper thin) steinkern, revealing it's small loop support. I can't express how fragile these things are, they usually pop off or just break into countless pieces. I set that nice piece to the side, and continued to split away. Right before I got to my big brachiopod, this little spirifer popped out and landed in my lap, I kid you not. It was pretty dirty, but it did have a nice noticeable bit of it's spiralia intact. Should clean up nicely. Anyway, heres the nice bigger brachiopod I had my eyes set on, freed of the chert. I like this one very much, and considered prepping it off the chert. I ended up working the chert so it will set up by itself during display. I didn't see much wildlife while I was out this time. I did see this cute caterpillar though. I've always had a soft spot for bugs. I think this guy is a Yellow Bear Caterpillar, Spilosoma virginica. I was fortunate, and took a lot of goodies home this trip. Here is what I find worth sharing. Yet to ID this brachiopod. Terebratulid brachiopods with small support loop intact. Spirifer brachiopod with partial internal spiralia Platyceras gastropod (needs cleaning) Actinocrinitidae (I think) crinoid calyxs, I left one embedded inside the chert and again worked this chert so it sits upright during display. Blastoid calyx, removable from its chert home
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