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Showing results for tags 'ordovician'.
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True Starfish or Fake Starfish?
Lucid_Bot posted a topic in Is It Real? How to Recognize Fossil Fabrications
Howdy! I'm just wondering if this is real. I've never seen one like this. It's Moroccan, Ordovician, Asteroidea or true Starfish. Thanks for the help.
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On Sunday, I took my once a year opportunity to get permission to enter a quarry that exposes the Galena, Ordovician rock of NE Iowa. The gentleman that owns the quarry enjoys the beer that I use as bargaining chips and it worked again!! As I approached the quarry, it became apparent that a new area was stripped of topsoil, leaving a flat bed of Stewartville Formation exposed for me to wander across. This formation is famous for the gastropod, Maclurites, which many local fossil hunters cherish such as @Bev, and it didn't disappoint. This was the easiest collecting I had done in awhile, just wandering across the exposed rock picking up it's treasures. Luck was with me last Sunday, in that this ledge was to be blasted the next day and ground into gravel! A few other gastropods were found as well as an occasional cephalopod. But the predominant fossil was that of the Maclurite. Here are just some of the loose ones found. I personally have a attraction to fossils left in matrix.
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This one came to me without any information. My best guess is some kind of Ceraurus, from a Trenton Group (Simcoe Gp?) formation in Ontario. Can anyone fill in any more detail than that for me? I know it's rough and maybe not enough features to identify it. Is the bryozoan identifiable? Is the rock distinctive enough to say which formation it might be from? I'll get better pics later if needed.
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Can anyone identify these trilobutts for me @piranha and possibly the nautiloid too, from Ellesmere Island, in the high Arctic of Nunavut? I acquired them from a local dealer because they were cheap but of course the information is not as extensive as one would like.... He had a few more things from Ellesmere also including a Maclurites-type gastropod and a segment of a larger nautiloid, kind of grotty but perhaps I should have bought them too to keep the collection together. (I could still do that) I can't find much in the way of papers online about this stuff from the little info I have except that there is Lower Ordovician rock containing Maclurites from the Bache Pen. on the E side of the island, but I can't find any Ordovician St. George Group except in Newfoundland.
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These questionable fossils were collected in eastern Iowa from the Brainard Formation, Maquoketa, Ordovician. All of the fossils seen contained pyrite or iron oxide on the surfaces, something that I am not used to in other areas of Maquoketa strata. This makes identification confusing for a few of my finds. Hopefully you can help!! #1 I suspect a trace fossil. Or maybe mineral deposit. #2 @Tidgy's Dad will be up to IDing this strophomena like brachiopod (I hope!!!) #3 Is this a craniid sp., or a bryozoan, or crania ancovered with bryozoan or pyrite. #4 This looks like a bryozoan to which something else attached and grew. Or maybe just a pyrite nodule?? The bryozoan stem goes completely through the nodule. #5
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I’ll show my collection here. 1. Agnostida This is my only example from this order. Itagnostus interstrictus Wheeler Shale U-dig Quarry, Delta, Millard County, Utah Middle Cambrian Purchased Scale bar is 1 cm.
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My last trip exploring the Maquoketa of Minnesota, a formation that is abundant in cephalopods, provided me with a serpenticone shaped specimen that I do not recognize. Help IDing this would be appreciated. The siphuncle is not visible in this specimen. I did some infill with putty to enhance its look (in my opinion). The small repair is delineated by the red marks.
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From the album: Minnesota Ordovician Decorah Cephalopods
Above view of fragile specimen of Triptoceras lambi -
From the album: Minnesota Ordovician Decorah Cephalopods
Triptoceras oweni - heavily bryozoan encrusted specimen. Medium sized for a Decorah Formation Cephalopod. Twin Cities Minnesota Ordovician. -
From the album: Minnesota Ordovician Decorah Cephalopods
Typical view from above. Two specimens - one looked too odd to be a bryozoan. -
From the album: Minnesota Ordovician Decorah Cephalopods
Triptoceras planoconvexum appear to be medium sized compared to the other Triptoceras species from Decorah Formation in Twin Cities. Rare. -
From the album: Minnesota Ordovician Decorah Cephalopods
Very worn specimen with barely any details left. -
I found this around the where the Cincinnati, Findlay, and Kankakee arches meet in grey clay with nothing else around it - not sure how to identify, any help appreciated.
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From the album: Minnesota Ordovician Decorah Cephalopods
The cut half which is a very thin shell filled with calcite minerals in a geode meaning it was complete hollow at the time of fossilization process. -
From the album: Minnesota Ordovician Decorah Cephalopods
Apparently Whitfieldoceras mumiaforme lasts into Decorah Formation from Platteville formation. This specimen has barely visible septae and is very thin. Seem to have enlargement on the left side which is constant with Whitfieldoceras and a bend along a certain portion of the shell. Ordovician, Decorah Formation, Twin Cities Minnesota. Rare. -
Found this in the Cincinnati arch along with standard brachiopods and rugose corals from Ordovician. I was thinking some sort of bryozoan? Crinoid ends don't look like this?
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From the album: Minnesota Ordovician Decorah Cephalopods
A large Endoceras proteiforme. From Decorah shale. Only a little section of the shell remains on the lower half. The segmented part are septum and the smooth part are siphuncle. -
From the album: Minnesota Ordovician Decorah Cephalopods
Poterioceras apertum found in St. Paul Decorah Shale Spring 2023. Rare from the looks of it. -
Howdy folks! I recently had a family trip to Ontario, and found a few rock exposures throughout Kingston to rummage around for fossils. I was digging into the Ordovician aged Gull River Fm, which has chert-like rock that I still find somewhat difficult to process. I managed to snag a little bit of rock to add to the weathering pile, and today I’ve found some interesting specimens. I’m looking at two unidentified pygidiums, and I believe I’m looking at half a Cephalon on the final slide. If anyone has literature they don’t mind sharing on the formation I’d love to read up, and I’d appreciate a little help ID’ing especially the Cephalon in question.
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Here are some trilobites I found in Colorado’s Ordovician limestone.
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This is a molt fragment of Isotelus sp. that I found in the Drakes formation in one of my usual spots. I've found isotelus pieces before, but this one is odd to me. In particular, I don't know what the lines on it are (not the cracks, I have the lines I'm talking about outlined in the pictures). I thought they might be a possible injury but I'm not sure.
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This tiny gastropod has me stumped. Does anyone recognize it? Thanks for any suggestions!!!! It reminds me a bit of Trochonema, but seems much different from those I have found in the past.
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We recently found these brachiopods and I was wondering if anyone is able to provide any more information about who they are. They were collected on the Western cost of Newfoundland and they are early to middle ordovician in age. If you have any other questions regarding the fossils let me know and I will do my best to answer. Anything would help, thanks!
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I’m helping fellow forum member @DrDave move and we came across this piece he collected from the Whetstone Gulf formation a couple years back. My immediate thought was “holy ___ that’s a jellyfish!!” but I can’t say for certain but oh my gosh if it’s not a jelly then it’s done a wonderful job at looking like one lol. any thoughts from the folks here ??
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Age: Ordovician: Approx. 454-452 Mya Formation: Decorah Shale Location Grant County, Wi Amidst the frequent outcroppings of Platteville Limestone in Southern Wisconsin, you occasionally encounter the overlying Decorah Shale. From what I read this formation is more frequent north of Grant County, and in Minnesota as well. The outcrop itself is roughly 200 feet in length, and only extends about 6 feet from the ground. Its located in a very remote area, amongst a sea of corn fields. Here are a couple finds from my third trip to this locality. Here is a complete crinoid calyx with associated pinnule filtering appendages. Complete crinoids are much more common in Silurian/Devonian stratum. Next is a hashplate, with a few assorted brachiopods and crinoid fragments. There were also a handful of brachiopods to be found alone as well. All of these are very similar to the Ordovician Lepidocyclus perlamellosa/H. capax. Although these were much smaller in size. A single Lingula inarticulate brachiopod, which was a huge surprise since this was my first one ever. I found a mid sized orthoconic nautiloid. This one is 7 inches (17.7 cm) in length. The approximate width at its widest end is 2 3/4 (6.9 cm). Note the visible septa markings on the specimen. This is an internal mold, so structure is a little different from that of a normal mineralized specimen. Not the largest from this site, as others I've recovered push 25 inches (63.5 cm). The internal siphuncle is exhibited here in cross section: I marked the cross section and direction of the siphuncle here. Phragmocones from this locality only preserve as internal molds without any calcified structure. As a result of poor preservation they can be difficult to spot. With a trained eye, it becomes significantly easier. Here are some additional brachiopods that I dug out from this locality. A fennestellid bryozoan as well. There were a few, but none to write home about unfortunately. My favorite finds at this location are by far the large nautiloids, which have been consistently produced from here. (If only I could find one at 6 feet now ) If anyone has an i.d for that crinoid calyx, I'd be happy to post measurements or more detailed photos. Other than that I hope to run out to Indiana sometime within the month, maybe I'll see some of you out there. -Jonah
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