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  1. I found this today while out side on a river bed. The part i found it at is usually not seen & covered by water but the river is unusually dry so i found it on an exposed part. I’ve tried reverse image search & using a rock identifier but can’t find anything that looks similar besides other kinds of fossils. I’m really interested in learning what it is!!! i live in southern minnesota.
  2. levip

    Sand dollar?

    I found this in moose lake MN looking for agates was curious what it might be thought possibly tiny sand dollar
  3. Found several of these on a beach in Grand Marais, MN on Lake Superior. The light colored part is a bit rougher feeling and the red/maroon knobs or nodules are quite hard and smooth and raised. I can’t find anything on them…someone mentioned in another forum possibly Rapakivi Granite or Granite Mica Schist but I think they seem a bit different than the images I saw of those. The largest one has a few tiny pockets of crystals. Thoughts?
  4. foundit1st

    ID PLEASE

    Trying to figure out what this is?
  5. wormpoopdirt

    Umm

  6. ridizzlehoffman

    What is this

    Trying to figure out what this is.
  7. missanne1975

    MN fossilized teeth, ID needed

    These were found in central MN and I do not know much more than that. Any additional info would be greatly appreciated!
  8. Tetradium

    Campylorthis deflexa

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Specimen on the Left is bought online, from Wisconsin Mifflin Platteville Formation. Campylorthis deflexa is the middle one with Rostricellula minnesotensis Leftmost. Oepikina minnesotensis is rightmost. The specimen on the right is the closest Minnesota mifflin Campylorthis deflexa like specimen that I could find. It is darker color rock so its harder to see good textures but if you look closer toward the edge you can see where ribs are which makes it more coarse than the much more numerous Strophomena and Oepikina which are distinct characteristic in Twin Cities bed.
  9. Tetradium

    Rostricellula minnesotensis

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    All sources had says there are only two genus of the family of this particular brachiopod and Protozgya and Rostricellula is listed for Platteville Formation. Protozyga is too different and much weaker ribs structures by comparations.
  10. Tetradium

    Anazyga plinthii colony

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Like Anazyga recurvirostis, A. plinthii tend to prefer muddy limestones and is locally abundant where found in Twin Cities.
  11. Tetradium

    Anazyga plinthii

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Flatter than A. recurvirostis and a bit bigger.
  12. Tetradium

    Anazyga recurvirostis (formerly Zygospira)

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Very recently in 2023 paper came out that basically places all Zygospira earlier than Mayville/Richmondian in genus Anazyga. Cinnicinntea website also had name change for Anazyga recurvirostis since it also extends into maysville formation. The Decorah Formation Twin Cities can have a lot of those but oddly enough to me they are very specific to muddy limestone as I never find them in the weaker shales for unknown reasons. One of the tiniest Decorah Formation Brachiopod species I have ever found, tiny enough to balance on eraser end of pencil. Compare to the other Anazyga species it is much smaller and more inflated in shape.
  13. Tetradium

    Anazyga lebanonensis

    From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota

    Those are the closest specimen I could find that I think is Anazyga lebanonensis. Described as longer in length than the other two Anazyga species from Decorah Formation.
  14. CrinoidConnoisseur

    Cephalopod Fossil or Just a Rock?

    Hi everyone! I was in SE Minnesota recently, looking through limestone outcrops where I have found cephalopods on a previous trip to Mystery Caves, MN. While looking for more cephalopods during my most recent trip to Fillmore County (and finding a few) I found this piece shown below. The fossil is likely Ordovician aged, as is common in SE Minnesota. The formation I am less sure about, but if I had to make a good scientific guess, it is the Galena formation. My question is if this is a cephalopod fossil that is just heavily eroded, of is this just a cool rock? I decided to also flip the fossil with my hand to better see the ends. Thanks for the help everyone.
  15. Plant impressions i found in material from the Coleraine formation of Northern Minnesota, which dates to 100-90mya, i confirmed with a paleontologist that these are first known plant impressions ever found up here which has me excited but neither of us know anymore than that theyre plant impressions, can anyone here maybe give more specific information from my pictures? i hope these pictures are good enough, i donated it for further study so I can’t get more. Even if you can’t ID them i still want to know what you guys think!
  16. Proboscidean from Southern MN gravel pit on Minnesota river. Mammoth or Mastodon? The acetabulum (socket) is approximately 7" in diameter. Sorry for lack of scale
  17. Irongiant97

    Cretaceous Reptile Tooth

    I found this in material from the Coleraine formation of Northern Minnesota, which dates between 100-90mya, which was part of the east shore of the Western Interior Seaway. So far i know it’s reptilian but I’m wondering if anyone can give me a more specific identification. The exposed part is about 2.5-3cm long.
  18. OSLO

    Tubeworm fossil?

    Hi all, I found this in far northern Minnesota near a river. The circle is on both sides of the 2" thick rock, so I am assuming that a cylinder extends through it. After looking at images online, I am thinking that it might be a fossilized tubeworm, but none of the photos that I've seen quite match. Northern Minnesota has obviously had a lot of glacial activity in the past (possibly Blackduck Formation in the location found), and this area has Neoarchean bedrock. Thank you for any information that you can provide!
  19. I'm currently working on a construction project in Minneapolis, MN. We uncovered some bones about seven feet down while excavating in the street. They are very dark brown. Help on ID would be appreciated. I know they're not fossilized but seem to me to be fairly old. Maybe Buffalo or Cow? Thanks in advance.
  20. starfish2o

    Unsure if this is a fossil or not.

    I found this rock (far Southwestern Minnesota) by a river in a pile of rocks placed their by the city. It’s possible it just came from construction and isn’t a fossil at all. But it’s also possible it was naturally occurring in the river as it was down near the water and the river has been a lot lower than normal. I have zero expertise with fossils, and was wondering if anyone recognized this as something. The “fossil” has 9 identifiable segments of concave rectangles all the same width and length, that curve around the rock. Any comments are appreciated!
  21. 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
  22. MN River Walker

    Diseased Bone Identification

    I walk the nearby rivers with my wife frequently, especially when the water is gets very low. We are located in south central Minnesota. We find many bison teeth, horns, bones, etc. We also pick up many shell fossils in matrix (lots of limestone around us). On a recent trip we found this strange old gem. It appears to me to be a sacrum that has been afflicted by some kind of bone cancer or other disease, but for the life of me I cannot identify an animal in our area that matches the shape of the central ridge. I realize it might be fused with bits of the pelvis and vertebrae, but I am just wondering if anyone has even a guess on this one. I held it up to a deer sacrum and it didn't even seem close. I have a real human pelvis and it seemed close to that than to any of the animal specimens I have. I really doubt its human, but again, I am at a loss. I appreciate your help!
  23. I_gotta_rock

    Hello from the Road

    There are road trips and then there are road trips. I've planned many a family vacation without a single mistake. Sometimes we hit a hitch if the plane gets rerouted due to weather or something. As much as I love Chicago, I avoid it not because strange things happen when we get too close. (I'm a little concerned about what tomorrow may bring as we pass close by.) But, it was never due to my poor planning. The last two weeks have been crazy! I had it all planned out around being in the Black Hills on Monday and Tuesday of this week. Five days out from approximately Philadelphia, five days in South Dakota, and five days home with a day to sleep off the trip before Rick went back to work. I checked the itinerary twice. I asked my hubby, Rick, to double check it. We hit the road. The first few days went as planned. If this is Saturday, this must be Ohio kind of things. We spent the night in a castle and fossil hunted at a dam spillway in Ohio. We looked for more fossils along a waterfall in Indiana. We spent the night in a wacky, artic themed hotel room in Illinois. We visited a cave in Minnesota and looked for more fossils. We camped out in Buffalo Gap National Grasslands and looked for gemstones. It was all going swimmingly. The first goof was missing lodging for a night in South Dakota. No biggie. we'll just find a place for the night, although if I had figured it out, I would have opted to sleep under the stars in the free campground at the national park for an extra day. At least we had a nice shower. It also gave us extra time to admire the geology of Spearfish Canyon, complete with a run down the natural waterslide at "Devil's Bathtub." Two days later, we got to the field station for our Hell Creek dinosaur hunt, the whole reason for the trip. We got there 15 minutes early… and waited. Eventually we realized that people should be there by now and checked the reservations. It wasn’t Monday and Tuesday, it was Tuesday and Wednesday. Oops. This means that everything for the rest of the trip is now off by a day and the lodging for this leg of the trip dries up a night earlier than we need it. We decided to camp out in the Spearfish municipal campground the last night in SD. I rested a continuing migraine and Rick sat down to Google Maps and Expedia to figure out the rest of the trip. The Hell Creek Hunt was freaking awesome and will get its own trip report, but the highlights included unearthing a big fossil log along wit a triceratops tooth, a champsasaurus tooth, a 66-million-year-old turtle toe bone, and a rather large log that will probably take years to fully excavate. The next big thing on the agenda was hunting with a fellow fossil buff I’d met on The Fossil Forum. He lives on the Iowa/ Minnesota border. Somehow, when was copying and pasting Google maps told me that I needed to go to Indiana, not Minnesota. Well, that puts a monkey wrench in things! We rerouted everything and I sent my fossil friend a message about the change in plans. Then I forgot to hit send. I wondered for two days why he did not reply. Finally he asked if I was still coming. I said yes, we’d be out his way tomorrow; that we were on our way to DesMoines, a few hours away. Well, It IS a few hours away, but we were already EAST of him and had no buffer time before Rick had to be back to work on August 1st. So, this is the one thing we just had to skip. BOO! Crossing my fingers for our next trip west, @minnbuckeye SO, now we are playing the next few days by ear as we hop from DesMoines to somewhere to Cleveland and then home. Do I dare to try Mazon Creek in the heat of summer with a million ticks? Brave my Chicago jinx? Find crazy roadside attractions and just stop as we see signs? Only tomorrow will tell. Regardless, we’re having a ball. The roof rack on our minivan is loaded with fossils and pretty rocks. We got loads of sunshine. We have stories to tell. It’s all good.
  24. Tetradium

    Triptoceras lambi

    From the album: Minnesota Ordovician Decorah Cephalopods

    Above view of fragile specimen of Triptoceras lambi
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