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Showing results for tags 'pendleian'.
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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.- 4 replies
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- 9
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- Carboniferous
- Co Durham
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I collected this brachiopod showing part of the brachidium yesterday - quite rare to see in this area. It's partially silicified and I was thinking of perhaps etching it out a little further. It's also a good geopetal example, with sediment in the bottom (graded if you look closely), the remaining void above being filled with calcite that has helped preserve the brachidium. On checking my photos, I realised that there were some nice clear foraminifera, about 1mm across, which I haven't really noticed much before from this limestone. These photos are just of the rough surface, taken just submerged which reduces the surface bumpiness and allows better contrast (much better than just wetting it). I think I've managed to identify the two(?) types shown here though I'm very happy to be corrected! There are many more in there and I'm going to cut and polish some of it. Great Limestone, Pendleian, upper Mississippian. Weardale, Co. Durham, England. Scale in mm. (The first Endothyranopsis is at the top near the rule, and another is halfway between the 10 and the rock edge. See blowups below.) ?Endothyranopsis sp. The white blob to the left of the obvious specimen may be the same species seen at right angles to it. Palaeotextulariid - I looked at a few genera of these and they're hard to distinguish from each other in a random section. More palaeotextulariids - at least two specimens Another ?Endothyranopsis sp. (actually on the reverse of the rock). General view - it might be zoomable to see various forams and bits - this is how I was looking for them and it seemed to be easier than with my x20 binocular microscope. Some good burrows showing up as well, especially in the bottom half. Finally, a view under water of the brachiopod - shows some quite jazzy calcite around the brachidium. I'm not sure if there's more than one loop here or just crystals growing out from a loop axis. Sparry calcite in the middle.
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- 6
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- brachidium
- brachiopod
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A rare genus from this bed, one previous record seen from Cumbria. It is common earlier in the Mississippian of the region. The voids are filled with transparent calcite. This genus has a lonsdaleoid outer dissepimentarium (looking like large bubbles). As is most commonly the case, it was largely removed prior to fossilisation, leaving a trace on one side (see photo 4). The contorted axial region is typical.
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- 1
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- axophyllum
- carboniferous
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