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Showing results for tags 'dalmanites'.
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Hoooooooooooorrrrrrrrrrrraaaaaaayyyyyyyyyyy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Here we are at last, into Adam's Silurian. Thanks for looking. First up is the Lower Silurian or Llandovery and I begin with a problem. I posted this one incorrectly in Adam's Ordovician as it had got it's label muddled up with an Ordovician Favosites I had that has vanished in the move here, but is being replaced by kind forum member @Herb Anyway, this, I remember now I've found the correct label, is from the greenish Browgill Formation, part of the Stockdale Group from a cutting near Skelgill (Skelghyll) in Cumbria, Northern England. It seems to be a tabulate coral, but I can't find any listed for this location, only mentions of small, rare, rugose corals. It has the star shaped corallites of a Heliolitidid, but seems to be tightly packed together like a Favositidid. A couple of species of Palaeofavosites seem to be close and are a bit star-shaped,, but anyone know any better? @TqB@piranha hmm who else? The coral bit, an external mold, is a maximum of 3.5 cm across and each corallite up to 2 mm.
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The thread http://www.thefossilforum.com/index.php?/topic/84678-adams-silurian/ was getting rather enormous, so I have decided to leave that one to deal with the Llandovery and Wenlock and put my specimens from the Late / Upper Silurian here, though I don't have a great deal of material from the Ludlow and Pridoli yet. However, I do still have some jolly nice specimens to show off here. Here are my other collection threads for the Cambrian and Ordovician ; http://www.thefossilforum.com/index.php?/topic/78887-adams-cambrian/&tab=comments#comment-832018 and : http://www.thefossilforum.com/index.php?/topic/78974-adams-ordovician/&tab=comments#comment-832912 In the mid 1980's, on the way home from one of my annual visits to the Hay-on-Wye second-hand bookshops, I managed to persuade my girlfriend at the time to take a bit of a detour and stop off at a roadcuttting just outside Aymestrey,, Herefordshire in the Welsh Borderlands. The rock here is the Aymestry (sic) Limestone Formation, part of the Upper Bringewood Beds and is Gorstian, Lower Ludlow in age, so about 426 mya and a little younger than the Much Wenlock Shale Formation. Many species of coral, trilobites and brachiopods found in the formation are the same as those found at Dudley, but the bed is noted for its massive numbers of the brachiopod Kirkidium knighti (was K. knightii),a lovely, large pentamerid. In fact, during my hour or so searching, I found almost nothing but this species, the only exception being a couple of Atrypa reticularis. The problem was that this limestone is thick and seriously hard, even the broken bits are generally huge, but I managed to obtain half a dozen reasonable specimens and about the same number of fragments. Over the years I have traded, given away or sold them, so that now I only have the best one left. Here is Kirkidium knighti : It's a shame the tip of the beak is broken off : I make index cards for all my fossils, this is the one I made for the specimens at the time, back in the mid 1980's : And today's version : There was a minor extinction between the Wenlock and the Ludlow, known as the Mulde event and it is often said to have primarily effected graptolites and conodonts, but it seems to me it had a massive impact on the bryozoan faunas of the time too. Gone are the varied stony stick and mound trepostomes that made up such an integral part of many faunas from the Middle Ordovician through to the Middle Silurian and even cystoporid groups such as the Constellariidae became extinct at this time. Trepostomes and cystoporids did survive until the end of the Triassic, but were never as important again, the bryozoan faunas would start to become dominated by fenestrids in the Devonian, though they reached their peak of diversity and distribution in the Carboniferous. I will look closely at my limited number of rocks, but I don't think I have a single Late Silurian bryozoan. I know our friend @Mainefossils studies the Late Silurian Leighton Formation in microscopic detail, but I can't recall him posting any bryozoans. Are there any, Asher, old chap? Interesting.
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From the album: My trilobites
This is a Dalmanites limulurus From the Rochester shale Middleport NY. I bought this one from a friend it is probably my best trilobite.- 1 comment
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I found this Dalmanites sp. specimen in an exposure of early Silurian Rose Hill Formation rocks. From what I can see, most of the trilobite is there, which is pretty rare for this area. From what I can see, there are two species of Dalmanites reported from the Clinton Group (which the Rose Hill Formation is a part of) in this area: D. limulurus and an undescribed species which was labeled in one report as "Dalmanites clintonensis", whose only difference from the other is, it seems, that it has fewer segments on the pygidium. Both species are reported from the Rose Hill, however the report (which is rather old and probably outdated) isn't totally clear whether or not the Rose Hill is too old for D. limulurus and all of the Dalmanites specimens should thus actually belong to D. clintonensis. I'm having trouble counting the number of segments on the thorax and the pygidium, but it looks like it has less than the number reported for D. limulurus. However, it also appears to be missing a spine at the end of the pygidium, unless that just wasn't preserved and/or I'm mistaken. I was wondering if anyone might be able to tell which, if any, of these species this trilo is? Tagging @piranha since I know you have a lot of experience with trilos. Zoomed in a little: Thanks for any help!
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This partial cephalon is on a block of lower Devonian Birdsong shale from Parsons. Tennessee USA. There are several types of Dalmanites in this shale and two other partials are on this same block. The problem is that none of the species that I am familiar with have an anterior margin that wraps around the glabella the way this one does. Even with the margin being broken along a suture, it still doesn't provide a match with anything I am familiar with from this formation, and I can only find a few types that would have this effect if a suture is followed. The lenses are missing from the eyes where they seem to have evenly broken at a suture. Even with it being distressed, the eye position is a bit odd. The closest I can find is Malladaia and it is not a perfect fit. I yield to sharper minds than mine.
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From the album: Nautiloid’s Trilobite Collection
Dalmanites limulurus Middle Silurian Clinton Group Rochester Shale Caleb Quarry Middleport, NY© Owen Yonkin 2021
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Hi all! Just wanted to share my little collection of trilobites and pals now that I have a small assortment. I hope you enjoy! I’m working up to actually getting out in the field soon, so hopefully a few finds of my own might join these fellers!
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This morning I made a trip to a local spot. Wenlockian. Gravicalymene celebra, measures 4cm This one was difficult to work with, as dolostone always is. Ommokris obex cephalon, which turned out to be partial, and a small ventral calymene. The arrow points to the tongue-like protuberance which I was able to extract in one piece and glue back on, giving this trilobite a gargoylesque appearance. And last but not least, a mystery find...
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So the new house and work have keep me way busier than I had expect. I finally got around to getting my prep room set up for the most part and got around to starting some prep. Here's what I started with. Then the progress of getting it there. I had an oopsie as my engraver kinda got away from me doing some damage. Finally I finished it off with a clear matte finish to help stabilize it and make it pop against the matrix.
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I thought today would be a good day to stay inside, relax, keep warm and draw again. A friend requested a particular Trilobite drawing. The subject this time is Trilobite Dalmanites limulurus, a Silurian bug from Middleport, NY. The graphic is more like a technical illustration than a cartoon drawing. It came out how I hoped, using textured paper, a 4B pencil, Charcoal pencil and an eraser.
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