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Showing results for tags 'great limestone'.
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Micro heteromorphic silicified ?gastropod ?microconchid Mississippian, England
TqB posted a topic in Fossil ID
Does anyone recognise this tiny silicified shell? It's about 2mm long. I haven't seen one like it before from the Carboniferous. From the Great Limestone (upper Mississippian, Pendleian Stage) from Weardale, Co. Durham, England. From a piece I've been dissolving in acid, containing silicified brachiopods, gastropods etc. It starts off with an open helical spiral (3rd photo) and then straightens out. It also has clear annular ribs. Although the preservation is imperfect and sugary, I'm sure it's shell replacement rather than internal mould, judging from other fossils in the pece. The various serpulid-like gastropods and microconchids I've come across elsewhere don't have the regular ribbing.
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- aberrant
- carboniferous
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Does anyone recognise this? I noticed it when scanning photos of a recently cut and polished piece of Frosterley "Marble" from Weardale, Co. Durham, UK. (upper Mississippian, Pendleian). It shows in section as a rod about 5mm long, with perforations, central ridge and a fine reticulate pattern. My first thought was a Fenestella fragment but it doesn't look regular enough and I can find no mention of the reticulate structure. Also, I've never seen bryozoans in this part of the limestone though they occur at other levels. Now I'm wondering about a dasycladacean alga - some look vaguely similar but all the Carboniferous ones I can find references to look simpler and fuzzier. Scale bar is 1cm, divisions are 1mm Contrast enhanced In context, showing ghostly appearance amongst the corals
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A very common genus, ranging from Ordovician to Upper Carboniferous to ?Permian. This specimen shows good internal detail of the narrow corallites (1.2 - 1.5 mm), including septal spines which are not diagnostic and may not always be present (this may be preservational). The long, infundibuliform (funnel shaped) tabulae are characteristic and show in some of the longitudinal sections. Scale bar 1 cm long.
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From the album: corals
Section just below top of the calice, showing central lamella and other axial structures continuing into central boss. Great Limestone, Weardale, County Durham, UK. -
From the album: corals
Section showing incomplete central lamella. Great Limestone, Weardale, County Durham, UK. -
From the album: corals
Section showing incomplete central lamella characteristic of the subspecies konincki. Great Limestone, Weardale, County Durham, UK. -
From the album: corals
"Standard" D. bipartitum section showing complete central lamella. Great Limestone, Weardale, County Durham, UK. -
Characteristic of the Upper Visean and Lower Namurian of Europe and Africa. Easily identified by its compact, cuspidate axial column made of small tabellae. One of the less common solitary corals in the Great Limestone, this one is in a dark matrix locally known as "Frosterley Marble".
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Partly preserved in what I think is ferroan dolomite, with clear calcite in the voids which allows a 3D view of the structure in places. A common cerioid coral at this level, with a wide range of preservations. Formerly Lonsdaleia which is now restricted to branching versions.
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- actinocyathus
- alston formation
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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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- axophyllum
- carboniferous
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