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Showing results for tags 'Mississippian'.
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I decided to travel to and visit my twin brother this past weekend. Sometimes, he's on-call for his job on the weekend and he happened to get a call for a job that would take 2 or 3 hours to finish. I didn't feel like sitting around a nursing home for some hours, so I decided to take the chance and visit a crinoid locality close by while I waited for him to get free. The area got a lot of hard rain and some severe weather during the weekend as well. With that in mind, I was hopeful some easy pickings would be washed out or weathered out from my last visit. A couple hours spent scouring the weathered hillside resulted in some okay finds. The first rock I flipped over had a nice Azygocrinus calyx on it exposed. Azygocrinus was the first crinoid I ever found while young, and that was what sparked my interest in crinoids. I set it aside with my keep pile, and kept on flipping bigger rocks over. I ended up finding another calyx exposed on a bigger block of limestone within a few minutes. It is only missing a few calyx plates, and looks like it will prep out nicely. I haven't counted plates or bothered trying to ID this yet. Another nice calyx was spotted exposed atop a nice washed out pile. I believe it is an Uperocrinus calyx. An easy clean up there. Another recently washed out calyx was readily exposed. I believe it is a Macrocrinus. A couple of other partial calyx bits were littered about. I left them in place. A partial Agaricocrinus. I believe this is a partial Physetocrinus. The last rather interesting find is what I think is an Evactinopora bryozoan. I posted it in the fossil ID section, but last I checked there was no consensus yet. I don't think it is crinoidal, but who knows. It looks like it has the classic 4 rays like Evactinopora grandis has. My brother finished up and gave me a phone call after 2 hours or so. After picking up my keep pile, I left back for town to smash him in some Super Smash Bros. That's all for now, thanks for reading.
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- burlington limestone
- crinoid
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Spines on silicified Latiproductus, Mississippian, England.
TqB posted a topic in Member Collections
Probably Latiproductus latissimus, Great Limestone, Mississippian, Pendleian Stage, Co. Durham, England. I've dissolved out a few silicified partial shells of this common large productid but these are the first attached spines I've come across so far. I can't find any literature where these have been figured before for this genus. Four are showing; there may well be more but the piece is very fragile and I'm stopping here! They only occur on the ventral (pedicle) valve, judging by the spine bases. The second photo is of a more complete ventral shell in the same piece, with typical spine bases. Scale in mm Usual preservation after acid extraction in this bed. (55mm across, quite small for the species.)
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- brachiopod
- Durham
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Does anyone recognise this? It's in a piece of Mississippian Great Limestone (north east England) that I'm acid dissolving for silica replaced fossils. It's about 7mm long and I'm stumped. I don't think it's bryozoan - no sign of branches or zooecia and we don't have Archimedes which it vaguely resembles. Foraminiferan? It has a resemblance to strings of Saccaminopsis (calcareous alga spheres) that also occur but they don't have the twist. Scale in mm In context, with brachiopods, brachiopod spines, corals, gastropods
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- barley twist
- Durham
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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.
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- Carboniferous
- Co Durham
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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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- Durham
- Eomarginifera
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Hi All. I am heading to the NAPC meetings in Michigan in June. Unfortunately the field trips filled up fast. I am hoping to take in a little local fossil collecting in the area if possible while there (anything really). If anyone has any suggestions I would love to hear from you. If you live in the area or are attending NAPC and want to organize an informal collecting jaunt I am happy to do that too. Thank you for the help!
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Sacramento Mountains - New Mexico, Ordovician - Mississippian exploration
Kato posted a topic in Fossil Hunting Trips
This was purely an exploratory hike to a remote area with no expectation of finding much. In that regard, I was not disappointed. I'd previously last covered some of this ground about 5 years ago and had forgotten how formidable it was to get into. The walk in a rocky canyon bottom for about 2.8 miles before taking another rocky side canyon ending at an Ordovician-Silurian dry water fall. Approaching the base of the dry water fall with Ordovician bedrock that was pretty much non-fossiliferous. At the base of the dry water fall to get a nature shot. This looks like it should be climbable and, perhaps it is, but I'm getting a bit too long in the years for such risky business. I took a bushwhack side trip up a steep hill. Fortunately, it had rained recently and the otherwise loose scree was a delight. Even if one could climb the lower falls they are faced with an unclimbable Silurain vertical wall. A view of that dry fall from the other side.
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- devonian
- mississippian
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Daylong collecting hike - Sacramento Mountains, New Mexico
Kato posted a topic in Fossil Hunting Trips
It's been several years since I've last posted. Had a bit of run-in with a medical issue that took me offline for awhile. I seem to be doing better and have been able to complete a daylong ramble in the local hills albeit at 70% of my former capacity. This trip is in the Sacramento Mountains and covers the hike into the Mississippian Lake Valley (MLV) Formation, specifically the Nunn Formation for collecting. The MLV is the last of the formations in the Mississippian locally. After that I ascended into the lower Pennsylvanian known as the Gobbler Formation here. The two Covid years + my own medical issue brought about a lot of negative trailhead access issues. The detours around these now restricted areas add to the hike length sometimes quite measureably. Once into the distant hills away from humanity things look much brighter. The following is a shot back into town and the White Sands National Park (thin white strip in the distance). I'm standing on the Nunn Formation of the Mississippian Lake Valley Formation. If you can't find a crinoid, horn coral or spirifer here you simply are not trying. A couple of crinoid hash slabs picked off the ground. There are plentiful root and stem pieces but intact calyxes are difficult to find and usually quite small (15mm).
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Sorry for no scale I am in the bush currently, these are in Mississippian strata In one area, Indiana are these worth taking? They look like plants
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From the album: Mississippian fossils
A nice calyx I'm working on cleaning up.-
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- burlington formation
- mississippian
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From the album: Mississippian fossils
A common calyx I recently cleaned.-
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- burlington formation
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From the album: Mississippian fossils
A nice little calyx I finished cleaning.-
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- burlington formation
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From the album: Mississippian fossils
Another large Eutrochocrinus calyx I cleaned.-
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- burlington formation
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From the album: Mississippian fossils
A large Uperocrinus pyriformis calyx I cleaned.-
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- burlington formation
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From the album: Mississippian fossils
A large Eutrochocrinus christyi calyx I cleaned.-
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- burlington formation
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I found multiple pieces of this rock which each vary in size but the shape and structure is the same. There is banding and in the middle of each is a cellular structure looking material. Is this some sort of plant? I am in Mississippian strata Indiana USA
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- mississippian
- pennington formation
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From the album: Mississippian fossils
I acquired this specimen from fellow member @Brian James Maguire, who collected and polished this beautiful piece. The colors are outstanding! Thanks again for the amazing addition to my odd brachiopod collection.- 2 comments
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- brachiopod
- ireland
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From the album: Mississippian fossils
A good view of basal plates of a Phanocrinus crinoid. -
From the album: Mississippian fossils
A nice little Phanocrinus crinoid calyx. -
From the album: Mississippian fossils
A superb Ameropiltonia lauradanae trilobite.-
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- boone county
- mississippian
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From the album: Mississippian fossils
A nice Deltodus toothplate I found on my hike through a creek today.-
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- boone county
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From the album: Mississippian fossils
Here is a cute little Comptonaspis pygidium I found on my last hike.-
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- boone county
- mississippian
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My Keokuk Limestone finds from this fall have now been cleaned and identified. I am struggling with a few and am reaching out for any suggestions to identification. Thanks!! 1. First up is a blastoid that can't be matched well with the three species to occur in the Keokuk. It is probably a weathered sample that makes identification tough for me. 2. A crinoid cup that I do not recognize. It is very round and smooth. Maybe it isn't a crinoid cup! 3. A second crinoid cup I can't identify. 4. A large gastropod that spirals backwards to most gastropods. Reminds me of Maclurites if this was Ordovician. Straparolus looks similar but spirals normally. 5. And finally a specimen I thought was a fenstrate bryozoan until I looked closely and saw it lacked the netted appearance. Maybe a dendroid graptolite?
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- keokuk
- mississippian
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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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