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Last weekend, I decided to venture out to my favorite site to find trilobites. It is a site better visited during dry weather, but I couldn't wait! I do not know which was muddier, the truck or me when I packed it up. Here is the location without the mud visable. This material is best approached by splitting larger slabs of matrix. The result is always a bunch of trilo-bits. This is a nicer hash plate found that day
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This specimen is from the Ordovician Platteville Formation of Wisconsin. The top part looks like a crinoid stem, but the larger disc at the bottom is throwing me off. My only thought was possibly a holdfast. Any thoughts?
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Synonym: Pleurocystites robustus Billings, 1854. Alternative spelling: Pleurocystis. Taxonomy from fossilworks.org. Diagnosis (Sprinkle et al., 1985): “Theca rounded-triangular, nearly symmetrical; 3 rhombs elliptical, dichopores occupying less than 40% of sutures; periproct occupying 70% of lower side, about 680-700 periproctals, no rectal lobe, anal pyramid away from margin; ornament composed of medium growth lines and few ridges radiating to the plate sides and corners; brachioles having large groove extending up aboral side, cover plates fairly large; proximal stem slowly ta
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- katian
- simcoe group
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With the nicer weather last week, I was able to make two brief trips to kick of the year. There still ended up being a lot of snow on the ground, but it was manageable. My first trip was to one of my favorite sites, a roadcut in the Pennsylvanian LaSalle Limestone in Illinois. Lots of the usual stuff was found, but the two trip makers were a small Peripristis shark tooth and a Linoproductus mass mortality plate. Here's the tooth. I think it will clean up nicely. And here are the Linoproductus. There's around 50 individuals present, and they are all quite small com
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A nice Dictyonema flabelliforme dendroid graptolite from Oslo Fields in Norway. It's Tremadoc, Lower Ordovician in age and is thus maybe around 480 mya. Another angle :
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From the album: Middle Ordovician Trenton Group in New York
2 cephalons: Flexicalymene senaria Unidentified Cheirurid Middle Ordovician Trenton Group Jefferson County, NY Collected 11/09/2020© Owen Yonkin 2021
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Acquired one in 2018, which I believe it should be a Calvapilosa kroegeri, or the 'armored worm'. Any ideas on this ID? Related link: https://www.theguardian.com/science/2017/feb/06/newly-discovered-slug-looks-like-a-hairy-toe-and-could-reveal-the-ancestry-of-molluscs-calvapiloa-kroegeri
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Graf, Iowa Orthocone Shell remnant or epibiont?
Crusty_Crab posted a topic in General Fossil Discussion
This is Isorthoceras sociale (Hall, 1877) from the Ordovician Elgin member of the Maquoketa from the well known Graf, Iowa location. They exhibit unusual preservation, including nacre and hollow camerae. According to Invertebrate Fossils (1952) by Moore, et al,, shells of nautiloids have an inner annulus layer, middle nacreous layer and outer porcelaneous layer. Is the circular pitted texture on the outside then the remnant of the porcelaneous layer of the shell or some sort of epibiont like a bryozoan? Plate 220 of Shimer and Shrock's Index Fossils o -
From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation
This is my first digital microscope picture submitted to this website. I tried it on bryozoan but couldn't see any significant differences. Part of Amphilichas cephalon close up. It was suitable because of its tiny size but was too big to get a full screen. Note the bumps on the eyes. -
From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation
Amphilichas sp. cephalon. This is pretty small - .7 cm across. Platteville Formation Twin Cities Minnesota. Rare. Its cephalon is very distinct, having 5 well definite lobes. -
From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation
Isotelus gigas thorax and pygidium from Galena Formation (thanks Kane for the positive id). -
From the album: Corals of Decorah Minnesota
Platteville formation Lambeophyllum profundum. Outer laver are gone. Uncommon to rare. -
After dropping my wife off in Georgia for a couple months, I decided to make a quick stop at a favorite spot of mine in Lawrenceburg, Indiana and do a little Ordovician collecting. I did not collect much on this visit, but kept a couple of the pieces that are shown below, it was just nice to be outside without a coat and to feel the 67 degree temp. Pictures of the area-
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Hi everyone. I am new to the group and would like to ask for some help in identifying this fossil. To my eyes it looks like a cephalopod but never seen one this big. Can some one help? I found it along Etobicoke creek. Any help would be much appreciated .
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More from the Etobicoke creek in Mississauga. Ive been slicing and polishing some worn down nautiloid fragments and they look pretty cool.
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I am confused about how to id Isotelus species as they all looks alike. I know I rex is out of the range for Ordovician Platteville/Decorah/Galena Formation. #1 is the most complete (minus head) from Galena formation in southern Minnesota. Its also the only Galena one I am showing right now as other still need cleaning. #2 The largest pygidium from Platteville Formation. Not the most complete I have but is pretty wide. #3 I am disappointed with the quality of pics but just showing here. Pygidium of smaller Isotelus species from Platteville with the farth
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Today on my way back home I spent a couple hours collecting on the mile long Ordovician roadcut of St. Leon, Indiana. I believe this roadcut exposes the portions of the Saluda and Lower Whitewater formations as well as the entire Liberty and Waynesville formations. No matter how many people collect at this site, there are always fossils to be found. Here are some pictures of the area.
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Hi everyone, I recently remembered the location of swatara Gap in Pennsylvania, I remember reading about it but the problem is that the site was covered up way before I was even in the United States, there is the swatara state park nearby but that has younger Devonian rocks of the mahantango. My question is are there any similar sites with Ordovician rocks anywhere in PA? I am especially interested in the Cryptolithus trilobites and if those can be found anywhere else around here as that would be a wonderful fossil to add to the collection and have the experience of uncovering.
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Id of Ordovician Trilobites of Bumastus and lookalikes of Decorah and Platteville Formation
Tetradium posted a topic in Fossil ID
#1 is one of the only complete trilobite I had not identify genus yet. Rolled up and in a tough to clean rock. Upper Decorah Formation (formerly Cummingham Formation). Cant see any eyes yet. #2 I had picked for size - Platteville Formation. Also because they have those lines you can see more clearly on the NE specimen. #3 is the tiniest of the Decorah formation group. #4 is the largest of the Decorah group. I had double and triple checked to see if it is a brachiopod - nope. #5 is the tiniest of the platteville group. Compare to -
Synonym: Diacalymene ouzregui Reference: DESTOMBES, J. 1966. Quelques Calymenina (Trilobita) de l’Ordovicien moyen et supérieur de l’Anti-Atlas (Maroc). Notes et Memoires du Service des Mines et de la Carte Geologique du Maroc, 188 1966: 33-52.
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- flexicalymene
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We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
not identified yet. Two very similar genus. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Unidentified orthid for now. Strongly resembles Dalmanella sculpta but have sharp edges. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Pionodema conradi. I knew I had some tiny orthid brachiopod from Middle Platteville Formation but after checking book and this website: https://2dgf.dk/xpdf/bull26-01-02-115-132.pdf Kind of weird. I think Hesperorthis concava was invalid - too similar and two very close look alike can't compete with each other. One other brachiopod mention on the list Campylorthis deflecta look too much like Strophomena species despite a website saying genus name is valid. -
A year or so ago a friend of mine was moving to a new job, and he decided to downsize his collection and concentrate on his real interest, elasmobranchs (sharks/rays) and fish. As a result I inherited a number of fossils, including a Moroccan trilobite. It had a few cracks that had been crudely "repaired" with clay. Recently I decided to "restore" it, which means I removed the clay (toothbrush prep) and returned it to it's unaltered state. I initially thought it was one of the common Flexicalymene ouzregui but as I cleaned it up it looked a little bit different from that species, and also
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