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  1. Cassandra Tiensivu

    Goniatite in Coldwater Shale

    Hey everyone. I’m looking for more information on Goniatites found in the Mississippian Coldwater Shale. I found this little guy today after cracking open another packstone (second to last photo shows the host stone) I picked up in South Haven, Michigan, along the shores of Lake Michigan. Any insights you could toss my way would be greatly appreciated. Thanks so much for your time!
  2. harosull

    9 Possible Fossils?

    More Lake Michigan - Long Beach, IN finds. #1 - just a rock? #3,5 - horn corals? #4 - favosite? #8,9 - more coral? Sorry about the photo quality/quarter as a size reference. It was the best I could do for now. Thanks for your input
  3. harosull

    What's this?

    I found this on the shore of Lake Michigan in Long Beach, Indiana– just south of the Michigan border. I have no clue what I am looking at. Any ideas? Thanks for your help!
  4. MIrocky

    Lake Michigan Help Please

    Greetings all! Recently pulled this from south shore Lake Michigan near the Mack Straights. Curious as to what the fossilized material is inside the upper shell half which is approximately 2.5cm across. Any ideas? Bonus points if you can identify the shell too Thank you!
  5. chemistographer

    Newbie Lake Michigan fossils

    Hi everyone, I just got to spend a couple days looking for fossils at Lake Michigan and came across a few that I couldn't identify. In addition to loads of Petroskey stones and Charlevoix stones, I came across the attached rock. Any thoughts on what may have been captured here? The stone is about 4 inches across at the longest (top to bottom in the figure). Location: Charlevoix, Michigan.
  6. Moose Man

    Cephalopod fossil?

    Relevant info first: This was found in Petoskey Michigan while looking for Petoskey stones. It was found in partially buried in sand. It is quite large and rather heavy. As pictured in picture 5, there is some sort of opening at the end? I can't get a very good picture of the inside, it's hard to get light where i need it and take a picture. the hole looks to maybe be about a 1/2 mm deep, and less than that wide. I took to reddit, albeit with less detailed photos and was told it was a straight shelled nautiloid cephalopod from the paleozoic, and that it was a brevicone, which I'm hoping someon
  7. DandelionWish

    Lake Michigan Fossil or Not

    Hello again! I received another trade today and was told this was a fossil found at Lake Michigan. I'm not entirely sure it's actually a fossil and I definitely don't know what it is if it does happen to be a fossil. I couldn't capture it with the camera but when I rotate it there are tiny glittery areas on some of the surface.
  8. Jim K

    Brachiopod

    Last week we took a ride to Lake Michigan to do a short search before the weather turned bad. The previous day had strong winds with large waves and I thought we might find some interesting things. We found plenty of Favosites, Halysites, and Rugose corrals as well as some of the other usual finds. The one unusual find was what I believe to be an internal mold of a Pentamerus oblongus brachiopod. I don't find many brachiopods and as such I'm not 100% sure on my ID. Please confirm or correct. Thanks in advance. Jim
  9. darkagetechllc

    Fossil ID needed

    We are interested in what the long skinny fossil with the flanges or fiber things are that look like a swimming thing. This fossil was found on the beach in Milwaukee Wisconsin United States on the shores of Lake Michigan. It was found on October 27, 2020.This fossil was found on the beach in Milwaukee Wisconsin United States on the shores of Lake Michigan. It was found on October 27, 2020.
  10. Buffy

    Fossil or pottery?

    Found on lake michigan. Im not sure how to tell the difference between fossil and a piece of pottery. Any advice?
  11. Buffy

    Lake Michigan Fossil

    My new find of the week was located on the shore of Lake Michigan in Glenn Michigan after some rain and high storms. I am needing help in correctly identifying this, i have some ideas but yall know more than i. And really wanting to clean this up. Was going to soak in vinegar but thought id ask before i touched it with anything other than dish water. Thank u
  12. We found the following in Harbor Springs, MI in July. Initially thought it might be petosky, but it’s a lot lighter in color and smaller markings. Thanks in advance!
  13. jschu2

    What's this cool fossil?

    Found on the beach of Lake Michigan in Sturgeon Bay, WI this past week. Approx 1" w x 3/4" h x 1/4" deep. Thank you!
  14. Pippa

    Lake Michigan Trace Fossil?

    Hi all, Is this a trace fossil, worm holes? If yes, that would be the first I've found. The holes measure about 1mm to 2mm in diameter. I think it's odd that all of the larger diameter holes are perfectly parallel to each other, while the smaller diameter holes seem to run perpendicular to the larger ones. Also, what are the dark thread-like shapes all over this rock. I've never seen those on my finds either. Rock measures 2cm tall, 1.5cm wide. Lake Michigan beach find, WI, this could be either ordovician, silurian or devonian. TIA! front:
  15. Found this rock on the shore of Lake Michigan near the beach canal entry to Lake Macatawa. Looks like the inside of a walnut. Thanks
  16. This rock has me puzzled. The sides look like they might be the laminae of a stromatoporoid. The top of the rock though, lacks any trace of mamelons and the wavy lines between them that I typically see on stromatoporoids. Instead the rock is full of Cheerios ;-). So I'm wondering if this is something totally different. Maybe geological? Oddly preserved oolites? But then, what are the layers visible on all the rock's sides? Dimension: 1.5" long. TIA to all! Detail of top: Side:
  17. I found all the crinoids below at Lake Michigan beaches in Illinois. (Silurian, Racine formation) I have to admit, I used to not pay too much attention to the ubiquitous crinoids on my hash rocks. That is, until I started to look at them with a clip-onto-the-phone microscope. I quickly found that crinoid disks aren't all the same and are actually quite beautiful and intriguing. Also, finding a pretty little crinoid calyx at the beach got me to look for more like it and low and behold, a short time later, I did find another one. I do believe they are very rarely found at Lake Michig
  18. I found this stone along the shore of Lake Michigan. I would appreciate any feedback as to what it might be? Thank you!
  19. Hi all,I'd appreciate your help with this Silurian Lake Michigan fossil from the Racine formation. I've done some research and found a family of Silurian colonial horn corals that have members which do look very much like my find. It's the Arachnophyllidae family. I'm not sure if they occur in the Racine formation though. Are these badly preserved stromatoporoid mamelons next to the horn coral? The rugose coral is growing on a stromatoporoid reef? Calyce detail: Here is a North American Silurian colonial coral that looks similar. It's Arachnophyll
  20. BirdyD

    Any ideas?

    Picked up this stone a few years back while visiting the area north of Traverse City on Lake Michigan. Lots of Petosky stones on this beach, but this really looked unusual. I’ve had some time to look at it while at home lately and wondered if anyone had any ideas? So curious because of the triangular shapes and line patterns.
  21. Hello everyone. As usual, I need your help with one of my finds. It seems this small rugose coral has a buddy. At first I thought the the tiny "bump" was just a bit of debris sitting on top of the coral. But now that it's enlarged, it looks to me somewhat similar to a crinoid. I'm not really sure though, I've never seen a crinoid preserved anything like this. Surely it's not part of the horn coral itself, or is it? Thanks to all for your input. Detail:
  22. Please help me to identify these two fossils. When I picked up these rocks, I thought I had found corals, but now, looking at them from all sides, I'm stumped. What throws me, is that the pattern on each of the two fossils looks the same all around the rock. No vertical structure or growth pattern, anywhere. So even if these are just broken off pieces of a much larger fossil, corals still would show vertical structures on the sides, right? But no "sides" are visible here. Confusing. Thanks so much in advance for taking the time to share your knowledge. #1: Dimens
  23. I picked up this jasper for its banding. Only later, when checking the rock through my hand lense did I discover what I think are a bunch of little rugose colonial corallites at the top and bottom of this rock. If these are indeed corals, all but one lack most detail in the center. If septa are faintly visible, they look differently preserved than on any of my other coral specimens. Mostly it's just circle after circle here, and areas full of "pores". Now that I'm looking at them on my larger screen, the "pores" themselves seem to be corallites - microscopic ones. The black
  24. Can anyone confirm that this to be a tiny horn coral at the top of this little pebble? Its diameter is about 3mm. It's not at all perfectly preserved, but what a surprise I had when I discovered it through my clip-on phone microscope. Sorry about the grainy quality of the close-up image, it's as good as it gets using a $4.50 clip-on toy microscope Also, I assume those are beekite lined shell bits on the sides of the pebble? TIA!
  25. Pippa

    Lake Michigan brachiopod

    My daughter found this nice little brach at a Racine, Wisconsin beach, with silurian bedrock. Milwaukee with devonian bedrock is not that far north. So the shell may very well be devonian. Can anyone help with identifying the species? Thanks in advance.
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