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Found 57 results

  1. 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!
  2. 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!
  3. 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: back bottom
  4. 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
  5. 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:
  6. 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 Michigan beaches, unlike the ubiquitous petoskey stones or honeycomb corals. So I've been trying to research Silurian crinoids from this formation, alas with very little success. Oh, for the lucky people who find Devonian crinoids, bibles have been written about those, I'm so jealous! So I'm turning to TFF once more to hopefully find additional information. Is anyone here familiar with Silurian crinoids from the Wenlock epoch? Is it possible to narrow down ID of at least some of these even though I don't have a single stalk or stem segment with the calyx and vice versa. # 1: Maybe a Crotalocrinites or similar? I'd love to know what its calyx looks like. Love the flower shaped lumen, it's so pretty! For comparison, this is a pic of Silurian Crotalocrinites from the British Geological Survey: I'm not 100% sure that they occur in the Racine formation though. Also, the lumen takes up more space within the disk than the lumen on my specimen above. Otherwise the flower shape seems a perfect fit, but hard to tell if the crenolae under the dolomite glaze on my piece are as fine and tightly spaced. Maybe a it's a close relative? #2: I haven't found a single image or description of a crinoid stem that looks like a perfect medieval tower. Anyone here that's familiar with such patterned crinoid stems? (Love the Danish pastry look on its top and bottom too) #3: I assume this poor crinoid was parasitized by some other live form? I know that brachiopods have been found attached to crinoid stems, as illustrated on Chicago's Field Museum work-in-progress website. But I don't think that's what happened to this one. What could have caused such extensive damage? #4: I think this one does have a cirri scar on its left side below. Detail of what I think is the scar in the 2nd pic. The following stem disks are all microscopic in size, less than 5mm: #5: I hope the lovely star-shaped lumen might make it identifiable. #6: Same as for the above, the ship's wheel lumen surely should help with ID? #7: Another Crotalocrinites or similar? Flower shape seems a bit different though, assymetrical. #8: I've found quite a bit of literature about star shaped jurassic crinoid columnals/ossicles, but nothing about Silurian ones. This one, sitting in limestone actually has the widest diameter of all columnals in my collection. Ø = 1.5cm. #9: First calyx. I think this one is very nicely preserved. Ø1cm and height: 1cm. Is it possible to narrow down its ID, despite missing the stem and arms? Also, in most images of crinoid calyces, the brachials visibly grow out of the side of the calyx. Not so with this one. Would they have grown out of the top side by side with its mouth and anus? #10: Second calyx. It's a bit larger, about 2cm wide and 1.5cm tall. Not sure what its original shape used to be, as it's been tumbled and worn and seems to be missing parts on its side. The top is hidden in matrix.
  7. I found this stone along the shore of Lake Michigan. I would appreciate any feedback as to what it might be? Thank you!
  8. 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 Arachnophyllum kayi. Found it in a USGS report about silurian horn corals. So now, to the "bumps". Mamelons of stromatoporoids? Thanks so much to everyone for your thoughts and input.
  9. 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.
  10. 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:
  11. 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: Dimensions: width is 2.2cm; height is 3cm, the individual circles vary quite a bit from <0.5mm to >1mm. Detail: #2: I wouldn't mind if this one is geological, as I collect more purely geological rocks than I do fossils, but I don't think this one is just geological. Dimensions: width: 3.5cm; height: 2cm; individual "dots": max 1mm
  12. 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 dots are in the center of honeycomb like shapes. I'm confused now, are these the fossilized remains of one or two type of corals, or maybe a colonial coral and a bryozoan? Sorry about the bad quality and distortion of the pictures taken through a microscope lens on my phone. Please help me ID these tiny hurricane look-alikes. As always, thanks in advance. Here a couple of them in various states of preservation. Lots of them have a vug where the center of the corallite would be. Here the circles look like growth rings and in some areas the "pores" are clearly visible. #1: This one is the only one with detail in the center. Septa? #2: a vug at the center seems all that's left here. #3: Just pores in the center, and in between the circles, maybe the faintest lines that could have been septa? #4: Area in between corals, with faintly visible honeycomb shapes: Detail of the above: Another area in between, looking somewhat different again:
  13. 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!
  14. 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.
  15. I went fossilling last Sunday (in the 50sF, in Chicago, in the middle of Winter!) and found some cool fossil rocks. I assume this one is either a orthocone nautiloid or a gastropod. Either one will be a first for me, so that's pretty exciting. No matter what it turns out to be, am I looking at a Steinkern here? Second photo: I think that #1 might be a nautiloid? The apparent crushed "spine" is confusing though. Could it be that the siphuncle does run in a siphuncle "deposit channel"? And here it was crushed and flattened? I even researched silurian trilobites, but their spines are much wider in relation to the rest of their bodies than is the case here. I'm stumped. I believe #2 is a stem of a branched bryozoan which has been worn so that the inner structures have become visible. Possible? Oops, I forgot to indicate the height of the rock. It's 2cm high. The width of the bryozon is about 7mm. Thanks in advance to everyone who'll chime in, I appreciate it!
  16. Normally Winter in Wisconsin isn't the prime time to look for fossils. Today we had record high temps. and decided to take the chance and drive 2 hours to the lake. My concern was ice piles on the shore line and they were well founded as many areas were not accessible. We found a spot which was accessible but the waves were washing up to the ice piles. Good enough. We were wearing knee high boots but still left a bit wet from some of the larger rollers. Our efforts were rewarded with numerous corals and a few other possible fossils as well as many interesting rocks. Here are some of those we found as well as a couple site shots. I'm not sure if the photo with two in it are fossil or not. Spring feels a bit closer today.
  17. My daughter and I took advantage of the unseasonably warm temperatures over Christmas to go rockhounding at a nearby beach. She found what looks like a colonial corals. At first I thought they might be rugose, but they're smooth, not wrinkled and each corallite has this round "cap" on. So then I thought of syringopora, but I think for that the corallites are too large. Also, the individual corals grow/point into all different directions. That made me think that they might not have grown together, but were just deposited into a heap. What do you all think? detail of the area just below the darkish top: small vug on top of one of the corals, with a bit of the structure showing:
  18. This rock was found in the shallow water off the South East shore of Lake Michigan about 20 years ago. No idea what it could be. Any help would be appreciated.
  19. Fossil ID please

    I found this fossil on a beach on the north shore of Lake Michigan near the Mackinac bridge. It’s about 3 cm. It looks kind of like a shell but I’m not sure. Can anyone tell me what it is?
  20. ID help please

    I found these two fossils on a beach near the Mackinac bridge in Lake Michigan, USA. Can anyone tell me what they are? The first specimen with the flat dark inclusion is about 5 cm. The second specimen with the many small lines and holes is about 4 cm. Thanks for your help.
  21. Anyone else see a badly worn and deeply buried blastoid here? Four out of five points are visible. And where the fifth should be, the rock is broken off. Just my overactive imagination? Please tell me what you think. Is there possibly a blastoid in this rock? Reasons against this being a blastoid: Guidebooks about Great Lakes fossils do not mention blastoids. Googling "blastoid and Lake Michigan" brings up nothing. It's maybe too large to be a blastoid? The diameter is 4cm. On the other hand: Just because fossil books and Google don't mention them doesn't mean that much. I've found rocks at Lake Michigan beaches that I've never seen mentioned in association with Lake Michigan. So, who knows...? Both geological surveys from Illinois and Wisconsin mention them. So they definitely grew in the shallow ancient sea that used to exist here. Anyway, if there isn't a blastoid within that rock, what is? seen from "top" seen sideways: bottom:
  22. Found this chunk of limestone at my Lake Michigan's sand depleted "beach". Due to the extremely high water level, storms have washed away pretty much all the sand at this beach, exposing the large underlying rocks. What do you think of the almond-shaped preservation of the interior parts, while most of the shells themselves have been dissolved away?
  23. 7 items in need of ID

    These are eight finds that have me scratching my head. Please help me identifying them. Some are so very worn, please feel free to just guess. #1: "Oddball". Feels glassy, hard. Inside, I can't see much further by eye than what's visible in the photo. Just more of the hardened lentil soup..... #2: "Mystery Shape" While it looks grainy, it actually feels really smooth and hard. It reminds me of a mollusk shell cut at a slant? Or an extremely wide spaced chain coral? I love its elegant shape. Oh, and it's about 2cm long. #3: "Bandaged Dude" Is it possibly a bryozoan "sheet" that's draped over something else? #4: "Spiral Stairs to Nowhere" I split a piece of limestone and several of these became visible, each in its own empty casket. Doesn't look like a crinoid stem. (Sorry about the out-of-focus, bad quality photo, alas, it was taken in fading light without a tripod) #5: "Zigzag Doodle" I promise, it wasn't me who defaced this rock... #6: "Gas Bubble" This thing has very thin but hard and very sharp edges. It's about 1cm deep, yet, it weighs all of 5 grams. I have the beginning of a paper wasp's nest of about the same size, which weighs about 1 gram. So it's barely heavier. Also, what might the small egg-shaped things be which are visible in the bubbles? Worms? #7: "Metallic Paper Fringe" The slight metallic sheen isn't visible on the photo. Anyhoo, I can't even guess....
  24. Lake Michigan Brachiopod?

    I found this little half-shell in SE WI. I think it is a brachiopod, but am not entirely sure. Originally it was more thickly encrusted, but I've given it a vinegar bath for about 2 days, and more details have now become visible. It is currently back in fresh vinegar, in the hope more of the crusty layers will dissolve. I would appreciate your help with identifying the shell and also its interior visible parts if possible. For example, none of the anatomy drawings shows interior "separation walls" such as I see here. And specifically, what is that thick appendix sticking out the side of the shell? Its end looks like fossilized soft tissue to me. Is this the pedicle? If not, what is it? If yes, I thought soft tissue barely ever gets preserved? Interior Side view
  25. Cup shaped sponge?

    I found this 4cm wide "knitted mushroom cap" at a beach near Kenosha in SE Wisconsin. I thought at first to have found a tabulate coral, but looking closer, I can't see any corallites at all and oddly, the top, instead of flaring out to a solid "table", curves back into itself, with most of the center missing altogether. All of this made me think that maybe this is a sponge? If not, what could it be? Top: Bottom: