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  1. rocket

    Stromatolite

    From the album: Permian fossils from Rheinland-Pfalz, sw-Germany

    a rare, 30 cm wide stromatolite from a closed site in Rheinland-Pfalz-Region. Permian age, showing fantastic internal structures
  2. Stromatolites are potentially present in every geologic period. Show any if you got 'em. The goal here is to represent every period, and every stage/epoch if possible, including subdivisions/periods of the Precambrian. These can be posted in no particular order. Any and all are welcome to post multiple examples from any period/epoch. I'll start with a specimen from the Pennsylvanian: Sniabar Limestone, Kasimovian/Missourian Stage, Pennsylvanian Kansas City, Missouri, USA The front side has been p
  3. Found in the side of a building and in the surrounding landscaping. From the Cambrian seashore sandstone of Blackberry Hill Wisconsin. The place is known for its fossils of mass jellyfish strandings and its trace fossils of some of the first arthropods, mollusks, and other animals on land. What are these? Thanks!
  4. I've been working on an apparently novel concept with planted terrariums incorporating diorama features to recreate ancient environments. This setup in a 65-gallon glass enclosure is the best developed so far. It combines plants more or less representative of a Late Cretaceous Sequoia Redwood forest with a proposed Hesperonychus elizabethae replica nest with eggs. This dromaeosaurid is known from a few fossils in the Dinosaur Park Formation of Southern Alberta and is apparently the smallest known non-avian dinosaur from North America.
  5. Hardly anybody ever talks about the Cambrian fossils of the southern midcontinent (USA). They're super-underappreciated. Show us what you've got! Here's one to start us off: Thorax and pygidium of a trilobite, possibly Orygmaspis, typically referred to as "Orygmaspis cf. Orygmaspis llanoensis" but probably a different species altogether. Note the two pairs of macropleural spines marking the final thoracic segments. Davis Formation (late Cambrian: Furongian), south side of Highway 8, St. François County, Missouri.
  6. WiscoChick

    Stromatoporoid or Stromatolite?

    Need help confirming what I found. This speciman was found in Milwaukee, WI. I found it in some loose landscape rock around the building I work in. Unfortunately I don't have a ruler on me right now but it's about 2 inches long and 3/4 inches wide. Originally I thought it was agate but someone in my rock group on Facebook says it looks to be silicified stromatoporoid. After doing a Google search I came across stromatolites also. So I'm not sure which one it could be. It's a beautiful specimen. What looks to be quartz on the bottom and what I originally thought was agate surrounding it. Any ide
  7. CornelDumitru

    Is this stromatolite?

    Hi! Is this a stromatolite? I picked up this rock on the premises of the Teleajen oil refinery in Prahova county, Romania. I have seen a chert wedge in a limestone boulder once upon a time, but this stone is different. It has layers of chert and carbonate, right? I grinded and polished the stone. Here is a close-up from the carbonatic area (fizzles with acid): Any idea how old are these rocks when found in S-E Europe? Thanks!
  8. mr fossil

    Stromatolite?

    Hello i found this pebble in a Jurrasic area in Oman . The waves on the beach smoothened it. I found numerous coral and bivalve and Gastropod fossils. im thinking this may be a stromatolite? could it be? thank you very much for your time!
  9. What better way to celebrate the end of the year than with a little fossil hunting? And the hunt ended with some spectacular stromatolites; read on! ----- When I got an itch to hit the field last month, I reached out to a quarry in Perrysburg, Ohio to collect fossil and mineralogical samples for donation to academic institutions. The quarry was kind enough to grant me permission to collect on their property for several hours in late December, so when the time came, I suited up and headed out with a trusty assistant. The quarry exposed outcrops of the Lockport and G
  10. minnbuckeye

    Polishing Mary Ellen Jasper

    While vacationing in northern Minnesota, I picked up this piece of Mary Ellen Jasper. My goal was to have one side polished in order to bring out the features of the stromatolite. Unfortunately, my attempts to find someone locally to polish it failed. Does anyone have knowledge of someone who could tackle this for me?
  11. Some day I'll bring the two home. But I don't feel like carrying them out one at a time.
  12. Since the spring my wife and I have been very busy with the garden and the orchard to maintain, the canned vegetables from our production, and we decided last Thursday to take a break for a geological excursion south of Clermont-Ferrand. The goal was twofold, to search for stromatolites and to take advantage of the volcanic context of the region. The detailed geological map of this area is unavailable but we had serious research ideas for our prospecting. The day began with a visit to a magnificent village that immediately immersed us in the context: Saint Saturnin. The walls
  13. I posted pictures of this uncut stone/fossil several weeks ago hoping for an ID, but since I didn't know the location it was found, the consensus was it most likely is stromatolite. I've had it cut and polished and it's gorgeous! It's very dark inside. The circular parts look like they are gray and black, but in real life it seems to be just 2 different textures of black. The parts that look more gray are rougher/grainier and the blacker areas are more smooth and reflective/shiny. The circular parts almost look like fluffy clouds. The in between area is dark gray until you get
  14. Hi, I bought this at a flea market in McKinney, TX about 8 years ago and am trying to get it identified. The person selling it didn’t have any information on where it was found or what it is. I took it to a local rock shop recently to see if it could be ID’d. The owner is more skilled in minerals, but he thought it might be a fossil (stromatolite), and recommended I reach out to someone skilled in fossils to know for sure. Magnets do not stick to it at all. I found a small seashell attached to it, but nothing else on the outside. It’s a rounded triangular shape. Measures about 8 1/2” (32
  15. I am heading to Herkimer for a trip soon, and I was wondering if anyone knew any places one could find fossils? I heard some of the mines have stromatolites but I could not find much information on that. I also hear about trilobites near the diamond mines, and I hope to find some, and if anyone has any advice that would be appreciated.
  16. MarcoSr

    Stromatolites

    Two highly polished, end cut Stromatolite agate achats from the Mátra mountains, Gyöngyöstarján, Hungary from the Miocene, 20 million years ago that I recently purchased. These are the first Stromatolite fossils that I’ve added to my fossil collection. I’m posting a few pictures to show the incredible colors in these pieces. End Cut (1) ( 543grams 103mm by 102mm by 35mm) End Cut 2 (166grams 75mm by 45mm by 45mm)
  17. Not sure what to make of this, came from mix of Cretaceous and QAL, breaks very easily. Thinking it's sedimentary but then wouldn't it be harder?
  18. TNCollector

    Cambrian Stromatolite

    Got the itch to collect and study some stromatolites, so I did some searching and feel that I successfully scratched the itch. I found a section of the Cambrian Copper Ridge dolomite that exposes a plethora of stromatolites of various morphologies. Many of them look as if they are straight out of Shark Bay in Australia, with the characteristic domal structure attached to a thinner holdfast on a hard substrate. Stromatolites are formed over a long period of time in tidal zones by colonies of photosynthetic bacteria and/or algae that form sticky layers that trap sediments and concrete them into
  19. I have seen this for sale online Seller got it from an old collection and has no provenance info. He has no idea where it was collected or formation info is this some sort of geological formation ? Or is it a genuine Stromatolite ?
  20. DPS Ammonite

    Miocene Lacustrine Stromatolite

    This silicified lacustrine Miocene stromatolite is a trace fossil made by a gram-negative photosynthetic blue-green bacteria. The originally limestone stromatolite was formed as a bacterial mat trapped sediment and precipitated limestone as it grew from the lake floor towards the sun. It shows classic convex layering towards the top. The stromatolites occur in tuffaceous and lime rich lake sediments that might be part of the Chalk Canyon Formation that is bounded on the bottom by basaltic lava and volcanic rich conglomerate and sandstone on the top. Locally numerous silicified cast
  21. A friend cut a polished a silicified lacustrine Miocene stromatolite from central Arizona that I found. Thanks Stan C. It is about 8 inches in maximum length. Two faces were cut that show the upward convex growth. I am currently looking for a researcher to help write a paper about these and the other plant fossils that occur in the area. A piece that was cut from the same colony as this piece is being donated to the Pinal Geology Museum in Coolidge, AZ. https://pinal geology museum.org Another Arizona museum wants one. I am seeing if other local ins
  22. ThePhysicist

    Texas Stromatolite

    From the album: Miscellaneous

    Found in the Red River/Lake Texoma. Likely from the Cretaceous-aged Paw Paw Fm. ~ 100 Ma.
  23. I went to the aquatics shop this morning to buy some fish food. They were selling these rocks as decor. Person helping me had no idea re provenance. I think they are geologic in origin. But with the banding was thinking there is an outside chance they could be Stromatolites About hand size.
  24. Mag

    Help please.

    Hi, I found this stone in...a charity shop. I really love it but I’m not sure what type of stone it is and the only one I can connect it to would be stromatolite. It has more unusual pattern though. Please could someone help me with identification. It has a clear quartz (I think) in the middle, it should be visible on the photo. Thanks
  25. Abyss

    Stromatolite ID help

    Hello all, & Thank you in advance. I was wondering if you could help me ID this Stromatolite species or location it could be from, it was a random buy & fair price, though it was only labeled as a Australian Stromatolite. I've looked at a Australian dealer that sells a wide range of AU stromatolites. I'm not coming up with a clear match that says this is it, I know stromatolites can vary some to a lot in a species & locality. Australian or some other location around the world ?
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