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Silicified rostroconch, tiny but complete, Mississippian, England
TqB posted a topic in Member Collections
I've always wanted to find a rostroconch in my local Mississippian rocks of N.E. England (or indeed anywhere) but never have. There's a handful of records from the area but they're very sporadic. I've finally struck lucky, very unexpectedly, in a a sample from the Great Limestone (upper Missisippian, Pendleian Stage) that I've been dissolving for silicified fossils. This is full of small brachiopods, gastropods, corals and various other stuff, all interesting but mostly predictable. Anyway, this turned up a few days ago and is instantly recognisable, despite being only 4mm long and preserved in typical sugary silica particles. Presumably Conocardium (like the few records), it has a very long rostrum preserved and the ribbing is apparent in the closeups. 4mm long Long rostrum on left, short main shell on right. With a similar though larger Permian one (photo flipped). Figure from Mazaev, 2015, "Middle Permian rostroconchs of the Kazanian stage of the East European Platform" Ventral view, rostrum pointing upwards, gape below. Posterior (rostrate) end, concentric ribs on shell below. (mm scale) Anterior (gape) end, again showing ribs either side.- 2 replies
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- Carboniferous
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Hi everyone! So About a month ago I found this partial fish skull at Charmouth, U.K. which has been identified for me as Caturus sp. I was hoping that I could maybe get some help on what parts of the skull I have here? I can identify the branchiostegal rays but that is about as much as I can do - as I’m very much an amateur who wants to learn more. Please forgive me if my guesses are wrong - any help at all would be greatly appreciated! I’m pretty sure these (A) are the branchiostegal rays? The cross section visible below of the next bone up from the rays (B) makes me guess it’s possibly the dentary? Which I guess would make (C) Maxilla? The top from the first photo.
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- Charmouth
- charmouth mudstone formation
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From a sparsely fossiliferous shale above the Great Limestone (U. Mississippian, Pendleian) in Co. Durham, England. Found a couple of weeks ago by a streamside while walking the dog on the moors. It's the spiniest specimen of Eomarginifera longispina that I've seen - a common species but usually found with not much more than the bases of the rather sparse spines preserved. When rough prepping it with a pin vice, the long spine appeared first and I only later realised it had the hinge spines at the top. They're tubular and rather crushed. Like many productids, the spines are only on the ventral valve so probably more to do with support/anchorage in the mud than with protection. Scale in mm From the Treatise, the same species with typical spine bases.
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- 14
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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From the album: Abbey Wood, London, UK; April 14 2024
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