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Found 329 results

  1. Is this a stromatolite?

    Is this sample from northcentral Indiana a stromatolite? Thanks in advance!
  2. Are these bryozoans?

    Are these two samples (from northcentral IN) bryozoans? The first image is 18 cm x 12 cm; the second is egg-shaped, same dimensions but has a dome. Thanks!
  3. syringopora or organ pipe coral

    I had thought syringopora and organ pipe coral were synonymous. However, I just read otherwise. How do I tell the difference? See attached photo of a fossil that's about 1 in./2.5 cm. I presumed it to be organ pipe coral. Is it? Thx!
  4. 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:
  5. Arctinurus?

    I think this could be Arctinurus occidentalis but not 100% sure...measures 20mm across. Any help appreciated. Sugar run @piranha
  6. Happy New Year all!!! I just want to share some photos of an Eucalyptocrinus Crinoid Holdfast plate I prepped six years ago. It's from the Waldron Shale Formation, Shelby County, Indiana. It's from the Silurian period, 424 million years ago.
  7. Crinoid ID from Keyser formation

    Hi all, Another couple of mysteries that I found at an old quarry near Mapleton, PA and are from the Keyser formation which is thought to straddle the boundary between the Silurian and Devonian periods. The layers they were found in were close to layers of the Tonoloway formation which is Upper Silurian in age. I found one item that I believe is a Mariacrinus pachydactylus based on the Paleontology of New York, Part 3, Vol 2, Plate 3. It's been preserved by a black colored Chert but I don't want to acid etch it any more that I have (about an hour in vinegar). The other oddball is this UFO shaped specimen. I've found similar examples before but I ruined any chance of seeing detail on the surface by soaking them in vinegar. This is the first example I've found since then. Close examination with a lens and microscope does not show any detail so it may need to be cleaned a bit more. The "Bottom" has a nick in it or maybe it was where a stalk attached? Any thoughts? Thanks for looking!
  8. About eight years ago I posted about some odd fossils that I found in the Keyser formation limestone and the consensus was that they were roots of Hexactinellid sponges (glass sponges). @piranha dug up some pretty good evidence that these are indeed from Hexactinellid sponges. I recently visited the quarry again over my Christmas break and found more examples. I'm wondering if there are some fresh takes on what these may be and if anyone has found something similar? For reference, these come from an old quarry near Mapleton, PA and are from the Keyser formation which is thought to straddle the boundary between the Silurian and Devonian periods. The layers they were found in were close to layers of the Tonoloway formation which is Upper Silurian in age. Specimen #1 - This is the most interesting example I've found as the threads all seem to come from a central area and radiate out. Also note that they are layered and some have hook like endings. Specimen #2 - This is a large plate with many clusters of these threads criss-crossing each other, but all in relatively same direction. Specimen #3 - This is the first example I have that is associated with any other fauna. The Brachiopod is a small Atrypa reticularis Thanks for looking and any suggestions are welcomed.
  9. 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:
  10. 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?
  11. Crinoid verification please

    Good morning. In the process of prepping/detailing this calyx I have misplaced some of the documentation. I know the crinoid is from the Waldron shale, Niagaran series in Waldron Indiana. Original purchase date was 1982. I have lost the actual name of the species, help please.
  12. Blair County, Pennsylvania (USA) Silurian... According to the map the likely guess is Clinton Formation, but my gut on site said "Wills Creek" Anyway, what do I have here? Small straight nautiloids or Tentaculites? How do you tell them apart?
  13. I was wondering through a beautiful moss covered forest in central Wisconsin(waupaca county) the other day and was walking though the creek picking up rocks that I thought looked neat. That’s when I came across this. One guy told me he thinks it’s some kind of clam from the Silurian period but it’s also covered in other fossils. Thanks! P.s. I’m sorry I had to hold them and get my fingers in the pictures, their was no other options.
  14. 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....
  15. 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:
  16. encrusted stone

    I plucked this from Cherry Creek in Winona Lake, IN, and am wondering what is encrusting the stone. Thx!
  17. Bivalves or Brachiopods?

    I'm in need of your help. I'm trying to learn how to recognize and maybe differentiate brachiopods from bivalves in the worn fossil rocks I find on Lake Michigan's beaches. If indeed it is one or the other, how do you tell which? In the photo below, what looks like the shaft of an arrow, is it the foot or stalk? OTOH, if it's neither b-pod nor bivalve, what is it? Often I find just bits and pieces in these tumbled rocks. I suspect some of them to be parts of shells, but I'm not quite sure. The shape within my blue circle below is visible over and over on many of my finds. Is thisa part of a shell? Or not? This fossil turns the corner on the same rock as above. It's visible on both sides of the fossilized rock, which is about 5mm wide. I've combined photos of both sides of the rock onto one pic. The total length of this fossil is just about 2.5 cm. I assume that's a cross section of a shell showing the insides of the two valves?
  18. Hello, I think the rocks below contain at least two different species of bryozoa fossils. Is it possible to identify them by name? If not, would better specimens with more visible detail make that possible? Some, as in the first pic appear as b/w, narrow lacy (sometimes striped) leaf like shapes. Others, as in the second pic, look more animal like, sometimes "hairy", but sometimes are just wide blobs with no visible detail. I'd really appreciate this forum's fossil experts superior knowledge. Thanks in advance.
  19. Hey everyone! I finally had a day to go out and enjoy a Saturday fossil hunting with no time limit!! I decided to check 2 middle Devonian locations that have yielded nice dipleura specimens in the past. I’m still looking for “that one” specimen....eventually I’ll find one. I didn’t find the trilobite I tasked myself to find but I did find awesome stuff on Saturday . So here is a little trip report from Saturday September 28, 2019 plus some extra stuff I found earlier in the month. I’ll throw it in at the end. I got up really early so I could get to Cole Hill by sunrise. I had 2 sites in mind from the start. My new house is now only 30 minutes away from CHR which was a nice surprise! Early morning view I’ve had some tough outings at Cole Hill. This rock is so hard!!! I’ve tried clearing overburden just to get to more immovable rock. Anytime I get things moving I find something decent so that was the goal. Find rock that moves!! I ended up finding a spot way off the main outcrop and I got to work. I immediately found a plate with 5 cephalons!! It’s not being very photogenic so I took a picture after making them wet. the right shot shows 4 cephalons stacked in between the white scale bars....the left one shows the 5 hidden cephalon that Is under another cephalon. The bottom piece is just a cheek but could continue I’m not sure. Not very photogenic but rare to find an assemblage like that. I was able to find an area with more weathered rock and I found around a dozen cephalons!!! These are the better and bigger ones. I have a few nice juveniles but they are half covered in rock. I liked these 2 a lot. The left one is very 3D (also came in 10 pieces lol) and the right one has all the cephalon margins intact!! some nicer pygidiums I found. I found 7-10 total in various conditions. I found a lot of associated fauna as well!! The Gastropods came from mostly one bedding plane. The same spot I found the cephalon hash plate these were not far behind littered all over. I also found a bunch of bivalves! Way more than I usually do. I collected more on this trip than I have in the past. The rock kept moving and I kept finding!! After I worked the shelf back far enough I decided I wasn’t going to try and find a new spot. 4 hours of collecting and it was time to go to Deep Springs Rd. Even though I didn’t find exactly what I was after I found lots of amazing specimens compared to past trips . Kept my finder crossed that DSR would be as kind. DSR next post.....
  20. Found this rock in Highwood, IL, north of Chicago. I used to give this rock not much thought, just assumed I had thin wavy crinoid stem molds. Looking at it closer, I'm not so sure any longer. The stems seem to me to be too neatly lined up, as if the individual stalks had been cemented together when buried. Also, the individual "stems" don't seem to each have their own outer skeleton, unless the white vertical lines contain both of the adjoining crinoid skeletons but just appear as one. What's the likelyhood of that? What do you all think?
  21. Fossil or cool rock?

    Is this a fossil?
  22. Is this a brachiopod?

    I was wondering if this is a brachiopod. Thx!
  23. Hi, all, A friend over on the Facebook group "Great Lakes Rocks and Minerals" recently posted this little silicified pebble she found along the shore of Lake Michigan, northern lower peninsula. The tiny pores got several of us on the group curious about whether we could narrow down a possible ID. Someone initially suggested heliolitid, but I think we ruled that out because there doesn't seem to be enough room between corallites for coenenchyme. We decided it must be some species of small-celled favositid, but is it possible to narrow beyond that? (My gut says probably not, since we don't have thin sections or better views!) I was curious about Astrocerium (referred to as Favosites venustus in older descriptions). It's described from the Silurian (Niagaran) of Michigan, which seems to fit with this style of silicification. Also, I think I see what might be interpreted as spinules in some of the corallites, but maybe this is just an effect of silicification. Plus, I guess spinules are pretty common in favositid species, so it could be any number of small-celled species of Favosites or Emmonsia. If anyone has examples of Astrocerium from their collection, I would love to see photos! P.S. Hope it's okay to tag you two, @TqB and @FossilDAWG -- wasn't sure of other coral experts to ask, though I know they are around! Thanks much! Lisa
  24. Hallo, in diesem Jahr fand ich ein problematische fossilen im Steinbruch von Bungenäs, Gotland / Schweden (Slite-Gruppe, Wenlock, Silur), hat jemand eine Idee, was das sein könnte? Meine erste Idee war , dass es ein Fragment eines Kopffüßer sein könnte , aber ich bin nicht shure! Grüße Uli
  25. Trout River NWT find - fossil or not?

    Found this at Trout River, NWT amongst other fossils in an area that is supposedly Silurian period. Rock is only porous on one side. I have no idea if it is a fossil or if the rock has been through some sort of physical change. Let me know if higher res pictures are needed. All responses are appreciated.