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Hi all! I found this tiny fossil today. It is a bit under half a cm long at its longest point. I can only imagine this is an echinoid but some confirmation would be great! Found in some very fossiliferous rock on the UW Madison campus in Dane County Wisconsin, known for being late Cambrian - early Ordovician. No clue where this rock was quarried. Thanks so much!
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Can you help determine if these are real as described and any steps I might take to further confirm the details? [seller verbiage removed -- Staff]
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We found this in the Yahara river in south eastern Wisconsin. Does anyone have any idea what it might be? The area was glaciated. The piece is about the size of my thumbnail.
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I live in Northern Wisconsin in an apartment complex, and the pathways outside are decorated with various rocks. I found this among them, and the closest thing I can think of is that this is a femoral head that is very encrusted in crystal. I'm not an expert, and I've only found one real fossil in my life; I'm also not sure where else to show this to possibly get some information, so any guesses would help out a bit. There is some black crystal inside of it, so I'm also wondering if this might just be some odd geode, but the shape just has me baffled. There is also some sort of pattern near the white portion that looks brown and has a sort of line pattern going up/down from that white portion. Thank you to whoever can shed some light here. VID_20230710_070618836.mp4
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Help me name the outstanding fossil deposits of the midcontinent Devonian
pefty posted a topic in Questions & Answers
Crowdsourcing / help request! I'm putting together a review article for the fossil collector community on the Devonian rocks of the American midcontinent, which I've defined as the gray area on the map below plus southwest Ontario. I'm hoping to include a section in which I highlight the midcontinent fossils of greatest renown for each of a number of taxa (list below). (I purposely leave "renown" as a somewhat squishy quality open to multiple interpretations.) I would appreciate (1) your nominations of any midcontinent Devonian fossils of great renown that I have failed to capture in the list below and (2) your assistance in filling in the blanks marked with "????" Thank you! List is below. Microbes: ???? Marine algae: ???? Sponges: Formosa Reef Limestone, SW Ontario Rockport Quarry Limestone, NE Michigan ???? Corals: Widder Formation, SW Ontario Jeffersonville Limestone, S. Indiana Petoskey Limestone, NW lower Michigan Hyolithids: Arkona Formation, SW Ontario Tentaculitids: Arkona Formation, SW Ontario Conulariids: ???? Bryozoans: ???? Brachiopods: Silica Formation, NW Ohio ???? Pelecypods: Arkona Formation, SW Ontario ???? Gastropods: Rogers City Limestone, NE Michigan ???? Non-ammonoid cephalopods: ???? Ammonoid cephalopods: Arkona Formation, SW Ontario Pelecypods: Dundee Limestone, NW Ohio Arkona Formation, SW Ontario Rostroconchs: Dundee Limestone, NW Ohio Trilobites: Silica Formation, NW Ohio Arkona Formation and Widder Formation, SW Ontario Haragan and Bois d'Arc Formations, SE Oklahoma Non-ostracode crustaceans: Chagrin Shale, NE Ohio Arkona Formation and Widder Formation, SW Ontario Silica Formation, NW Ohio Echinoderms: Arkona Formation, SW Ontario Silica Formation, NW Ohio Thunder Bay Limestone, NE Michigan Graptolites: ???? Fish: Rockport Quarry Limestone, NE Michigan Columbus Limestone, central Ohio Cleveland Shale, NE Ohio Woody plants: Ohio Shale, Ohio Herbaceous plants: Grassy Creek Shale, E Missouri
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Good afternoon, I'm a noob here but over the past 3-4 years I have wandering our swamp and have found a few interesting specimen. One of which I believe to be a larger animal head as well as two interesting, well preserved pieces of coral, as well as (weight and measurements indicate) a meteorite. These are all from the swamp so determining age/layer is difficult. We are in a valley I believe it to be an old lake or river bed. Please see the attached images and share thoughts.
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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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Hi everybody. I live in Wisconsin and primarily collect dinosaur fossils (which unfortunately I can’t find in Wisconsin) but I have recently really been having the urge to search for fossils myself so I’m wondering if anyone has info on Wisconsin fossils. I know there is a spot in Waukesha where some unusual fossils were found and a spot near platville where some great trilobites are found. Does anyone know how to get access to collect at these types of sites or any other good options? Also just out of curiosity, is Wisconsin a rarely collected state which could leave many potential new things to find?
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This is a rock that I found in the water at the bottom of the Saint Croix. I’m trying to decide if the fossil itself are actual fossils or are they trace fossils. I don’t think it’s a worm tunnel and appears to be at one point possibly one complete bone. However, I am very open to whatever anyone has to say on this website. I have posted it on the Great Lakes rocks and minerals page on Facebook. I do not have an SLR camera. And that could possibly be the reason. It’s hard to tell.
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I found these Devonian bivalves (?) at the Milwaukee formation at estabrooke park in Milwaukee Wisconsin. I think the first one could be a bivalved arthropod like an ostracod and the second could be part of a brachiopod. Any help is appreciated! Thanks. Sorry for lack of scale! I just put one in my rockhounding bag.
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Hello! I found these fossils(?) at Estabrook park which is part of the Devonian Milwaukee formation. They appear to be external moulds. These were found near the Lindwurm and Berthelet Members. Are these jawless fish? Big brachiopods? Non-fossils? I’m stumped on these. The formation is known for its plants, giant fungi, jawed and jawless fish, Cephalopods, and Conulariids. So sorry for the lack of scale! I need to start carrying a tape measure with my fossil hunting backpack.
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I was wondering if I found an external mould of the Devonian gastropod Platyceras. The fossil curves in the rock which was hard to capture with the lighting. The rock was too big to carry back and I didn’t have a ruler with me so I apologize for lack of scale. Thanks!
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Hello, While rock hunting in SE Wisconsin on the Lake Michigan shoreline, I came across this bone. Any thoughts?
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Crinoid calyx or echinoid? Found in gravel with Ordovician-Devonian fossils. About 2cm across at the widest point. Druzy coating over the fossil which seems to be an external mould. In orange jasper. Thanks so much!
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Most complete Bufoceraurus cephalon found and donated 4/23
fossilized6s posted a topic in Partners in Paleontology - Member Contributions to Science
Haven't been on here in years, but i figured you guys would enjoy this. I was lucky enough to find the most complete Bufoceraurus cephalon of this species ever found and donated it to Gerald Kloc for prep and description. I can't wait to see it prepped! It's from the Platteville formation, WI.
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I found these burrows in Ordovician-Silurian rocks in Waukesha Wisconsin. I found hundreds of these just a few weeks ago in Green Bay WI (Ordovician) any way to identify what animal made these burrows? Thanks! ps: so sorry I forgot the scale
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I was in Milwaukee for a concert last weekend and I decided that I should revisit the local natural history museum while I was there. The Milwaukee Public Museum was a childhood favorite of mine- it honestly left a stronger impression on me than the Field Museum, and there is one main reason for that: their incredible life-size reconstructions of prehistoric life. So that is where my focus for this report will be. The fossils on display were mostly casts, and nothing stood out to me as particularly notable. Near the entrance, the museum had a diorama showing paleontologists at work, along with some featherless dromaeosaurs. Nearby, though, they had a reconstruction of one with some plumage on: The first ancient ecosystem you encounter when entering the hall of prehistoric life is the Silurian seas that covered the area. This is an incredible display, teeming with trilobites, crinoids, brachiopods and the enormous orthoconic cephalopods. Up next is a small display of tetrapod evolution- this one spans multiple periods, featuring Ichthyostega in the water and Seymouria on the land. Across from this was the Pennsylvanian coal swamp display case. This one unfortunately was very slightly run-down, with some animals from the accompanying identification key missing. But I still greatly appreciate the detail and care that must have gone into creating it. I especially like the attention to detail in the display, and the inclusion of some smaller animals like the coelacanths in the water. I have to pause here, but I will return with my dramatic and enduring core memory of the museum later, the Mesozoic display!
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Trying to figure out the species of brachiopod but I’m unsure. Founds on Lake Michigan in southern Wisconsin. Measures roughly 2 inches
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Found these weird spirals in this chunk of agatized rock. Devonian from Bradford beach in Milwaukee. Thanks!
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Silicified sponge(?) fossil found in Wisconsin Paleozoic gravel. Likely Ordovician or Silurian, possibly Cambrian or Devonian. Thanks!
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Best places in Milwaukee, WI, to find outcrops of the Berthelet Member, Devonian Milwaukee Formation
Joseph Fossil posted a topic in Questions & Answers
I've been researching good fossil sites near/at Milwaukee, Wisconsin (primarily from the Milwaukee Formation (dating to the Middle Devonian (Givetian)) when I just found out the most of the Devonian fish fossils that have been found from that formation have been found from a particularly member strata - the Berthelet Formation. Gass, Kenneth & Kluessendorf, Joanne & Mikulic, Donald & Brett, Carlton. (2019). Fossils of the Milwaukee Formation: A Diverse Middle Devonian Biota from Wisconsin, USA. I'm aware that time has seen the Milwaukee formation largely buried, after the cement quarries that dug into the formation and helped fuel the fossil discovery boom in the 1840s-1900s shut down by around 1910. I also know there are some places in Milwaukee where outcrops of the Milwaukee formation can still be found. I'm wondering if anyone knows any spots near/at Milwaukee where Berthelet Member outcrops of the Devonian Milwaukee Formation can still be found? -
The preservation isn’t the best. Broke open a big piece of dolomite with a nice brachiopod. Found that I had shattered whatever this is and exposed some nice silicified chain coral. It’s sorta a hemisphere with internal structures. My best guess would be some sort of echinoid. Silurian Wisconsin, Hartung quarry
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Found this fossil while digging a window well. It broke from my shovel and this was found inside! Still not able to identify it.
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This was found in a back yard in central Wisconsin among dozens of cobblestone type of rocks. I took photos of all sides of it. What is it?
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Found in the side of a building in Wisconsin, Cambrian-Devonian rocks here. Any ideas? Thinking bivalves or a bivalved arthropod. Sorry for the lack of scale! Each one is about the size of an apple seed
