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Found 15 results

  1. NanaRocks

    Stromatolite?

    I'm hoping for a proper identification of the pictured rock. It is 5.5" long, 3" at its widest, and 2" in height. I found it in the area of a former gravel pit just to the north of Grand Rapids, Michigan. I've researched it and it appears to be a Stromatolite. Please assist?
  2. I haven’t posted a stromatolite in a while. I’ve been preoccupied with biominerals and petrified wood. To see an old thread on stromatolites in my collection, check out the below link. The below stromatolite slab is one of my favorites in my collection because of its composition and formation story. This slab is a breccia created during a Mississippian time-period Impact (large meteor or asteroid) in Missouri that blended Cambrian aged laminar stromatolites with Precambrian aged iron. The close-up pictures below show the EDIT: agatized interdigital spaces of a stromatolite embedded in the iron. The last 5 pictures are at the highest magnification and show the stromatolite patterns and breccia patterns. Mississippian Impact Breccia Slab, Agatized Cambrian Laminar Stromatolite blended with Precambrian Iron, Crooked Creek Structure, Crawford Co., Missouri (264 grams 6.125x3.5x.375 inches): This slab was sold as fossilized coral. I could tell from the pictures that it was actually a stromatolite which I’ve confirmed with two stromatolite experts. The interesting thing is that it is from the Miocene of Indonesia. Both the time period and location make the specimen rare. Stromatolite Slab, Miocene, Indonesia (109 grams 3x2.75x.125 to .5 inches): Marco Sr.
  3. MaryLynnRocks

    Stromatolites found in Knox county TN

    I have several stromatolites that I've found in Knox county TN. They've only been found one 1 other location in Tennessee, by a boat ramp in Claiborne county. These aren't near a body of water, they're setting on top of very damp, moss covered ground. Claiborne county is about 45 miles north.
  4. The world's oldest fossils or oily gunk? Research suggests these 3.5 billion-year-old rocks don't contain signs of life Birger Rasmussen and Janet Muhling, PhysOrg, The Conversation. February 2, 2023 The world’s oldest fossils or oily gunk? New research suggests these 3.5 billion-year-old rocks don’t contain signs of life Birger Rasmussen and Janet Muhling, The Conversation A 3.5-billion year old Pilbara find is not the oldest fossil: so what is it? David Wacey and Martin Saunders, The conversation, April 2015 The open access paper is Birger Rasmussen et al, 2023, Organic carbon generation in 3.5-billion-year-old basalt-hosted seafloor hydrothermal vent systems, Science Advances (2023). DOI: 10.1126/sciadv.add7925 PDF file for above paper Yours, Paul H.
  5. 3.5 billion-year-old rock structures are one of the oldest signs of life on Earth By Stephanie Pappas, Live Science, November 10, 2022 Hickman-Lewis, K., Cavalazzi, B., Giannoukos, K., D’ Amico, L., Vrbaski, S., Saccomano, G., Dreossi, D., Tromba, G., Foucher, F., Brownscombe, W. and Smith, C.L., 2022. Advanced two-and three-dimensional insights into Earth’s oldest stromatolites (ca. 3.5 Ga): Prospects for the search for life on Mars. Geology. Yours, Paul H.
  6. lewcharles1

    Stromatolites

    Hi, I'm in Morocco and I read a couple of posts about the ambivalence of stromatolites. I bought one of the ones which appears not to be and resembles a desert rose, but I also went out back with a seller and spotted what I believe to be a genuine one. Any thoughts?
  7. Wrangellian

    Show us your stromatolites

    ...also oncolites, thrombolites, microbialites, related things can be included. We can also include BIFs (Banded Iron Formations) and suchlike, being indirectly created by early life, but there will be a preference for biogenic stuff. I don't think this topic has been started already (I would have thought it has), so it falls to me. If one already exists, maybe this can be merged with it and I'll edit accordingly. Some of us have been showing each other our stromatolite finds/acquisitions in other topics and it seemed like a good idea to make a central depot. Links to preexisting posts are welcome, if you don't want to make duplicate posts here. I'll start it off with some of mine. I did a photographing blitz and then finally got done editing them. Some of the slices have not yet been polished, so I had to photo them wet, though some wouldn't hold the water so I gave up and photo'd them dry. First, my Australian examples... Apparently this one is (mid?) Cambrian, from the Barkly Tableland of the Northern Territory, west of Camooweal, Queensland. I like that it has some of the natural eroded surface as well as the sliced (and thankfully polished) surface: I wish this piece were bigger. It must have at one time passed through the hands of that dealer in England who chops everything up into small pieces to maximize profit, but I don't know. Earaheedia kuleliensis, Paleoproterozoic/Statherian (~1.75 b.y.), Kalele (Kulele?) Limestone, Wiluna, Nabberu Basin, Western Australia: I doubt this one is technically a stromatolite or microbialite - just layers (varves?) of BIF sediment, but it did exist at a time when there was single-celled life on Earth, pumping oxygen into the seawater, turning iron suspended therein into iron oxide which precipitated out to form the Banded Iron formations. And anyway it's too cool to not include. The rockhounds refer to this stuff as 'Snakeskin jasper'. 2.45 b.y. (Paleoproterozoic/Siderian), Weeli Wolli Fm (Hamersley Group), Turee Creek Station, SW of Newman, WA. (Pilbara Region) A couple more BIF pieces from Australia, just because it's so interesting and indirectly biogenic... Rockhounds refer to this stuff as Tiger Iron (ie. Tiger-eye in Banded Iron). I understand there are 2 different locations: the Ord Ranges/Port Hedland location (Cleaverville/Nimingarra Iron Fm, Mesoarchean 3.02-3.1by) and the Marra Mamba/Brockman location (Marra Mamba Fm, Neoarchean 2.6by), both in the Pilbara Region of Western Aus, but I'm not sure how to tell which one this might be from. I lean toward the former as the latter is apparently less common. If anyone has more expertise on this I would appreciate a tip. The Tigereye is a pseudomorph (replacement in silica) of selenite growths in the sediment after deposition, if I'm not mistaken? I need to check that to be more confident. ( wet ^ --- dry v )
  8. minnbuckeye

    Stromatolite vs Stromatoporoid

    Lately, I have been enjoying @Wrangellian's Show us your stromatolites. It made me think about some of my finds. I will post just 2 of them for the purpose of figuring out if they are stromatolites or stromatophoroid sponges. These were collected over the last month. The first came from the upper Ordovician of NE Iowa.I can NOT tell the difference!!!! It can be frustrating. The second ones, which I am pretty sure are stromatoporoids, came from the Devonian, Solon member or just above it, of central Iowa.
  9. Hi everyone, I have been collecting fossils for some time, but this is my first post in the forum. I've recently acquired a stromatolite slab from the Strelley Pool formation. I have access to a laboratory compound microscope, and I was wondering if there is anything interesting that can be seen under magnification. I understand that I probably won't be able to see microfossils of any sort in this magnification, but I'm just wondering whether there are any interesting/discernible structures. I have an image that I took via this microscope attached below, and I can see dark clusters and white flakes amidst layered brown bands. Are these ordinary rock inclusions or does anything indicate past biological activity?
  10. In a beach near Galaxidi, in Greece, i found some grey fossils on rocks with layers, just like the stromatolites. I believe that these fossils are members of Francevillian biota, witch includes the earliest multicellular organisms that was found in Gabon. These are the reasons that make me think that these fossils are from the Francevillian biota; 1.The fossils have got the same thickness with these that were found in Gabon; 6 mm. 2. In the past, one part of Eurasia (probably Greece) was next to Gabon in the Paleoproterozoic era, when the Francevillian biota appeared. 3. Its rock has got the same color with these from Gabon. Probably are made from the same minerals. 4. The fossils have got the same forms with the members of the Francevillian biota.
  11. DPS Ammonite

    Miocene Fossil Microbe ? Mats

    I found the silicified and brecciated laminar structures in Miocene lake deposits north of Phoenix, Arizona. Could they be disturbed algal mats? I envision a drying algal mat in a lake that is disturbed by an event such as a flood, windstorm, landslide or earthquake. Compare to Kinneyia trace fossil: https://woostergeologists.scotblogs.wooster.edu/2015/10/23/woosters-fossil-maybe-of-the-week-kinneyia-ripples/ Confirmed stromatolites occur nearby in the lake sediments. Photo 1: typical wrinkled/ cracked marks in surface of laminar structures. Photo 2: typical piece of folded and brecciated laminar structures. Photo 3: detail of photo 2. Photo 4: edge of rock in photo 2. 4.5 cm field of view. Photo 5: Another piece. Photo 6: detail of photo 5. Photo 7: edge of photo 5. 3 cm field of view.
  12. DPS Ammonite

    Arizona Miocene Meanders

    Miocene lakebed deposits north of Phoenix have revealed more than palm and unknown reed like plants. I found stromatolites preserved in black, gray and white chalcedony. Although not as common as in the Precambrian, stromatolites still occur in oceans and in lakes. See article about the ones in Utah’s Great Salt Lake: https://geology.utah.gov/map-pub/survey-notes/glad-you-asked/is-there-coral-in-the-great-salt-lake/ My favorite one is this 10 cm high detail of a much larger stromatolite. #1 This 38 cm one came home with me. #2 Here is a detail of #2. 9 x 13 cm. #3 Here is a 6 cm high relatively flat stromatolite. #4 Detail of side of #4. Scattered pieces of palm occur. 9.5 cm high. #6 This silicified palm has calcite crystals growing in it. 13.5 cm long. #7 Detail of #7. It looks like an art piece.
  13. Not had a chance to get out hunting much for a while but had a trip out to a new site the other day and found some brand new stuff I wanted to share! Just outside of the little coastal town where I stay in Fife, Scotland there's a Lower Carboniferous stromatolite bed known for its beautiful stromalolite formations in a hard cream colored limestone which can be cut and polished for use in jewelry. This stromatolite bed lies on top of Lower Carboniferous lava's and has been correlated with another, 30m above a bed called the Burdiehouse Limestone which I do a lot of my collecting from. This puts its age somewhere in the late Asbian. These stromatolites grew in a freshwater lake that had formed on cooled lava flows. Its a challenging and dangerous site to collect from on an extremely steep and crumbly wooded slope below cliffs, very quickly though I started to find beautiful fragments of the stromatolite bed as well as a completely weathered out example and lots of split-able limestone with the occasional fish scales, freshwater bivalves and microconchids. The real prize of the day though was a beautiful and perfectly intact Petalodont shark tooth just lying on the surface of a massive block of the stromatolite bed, this stuff is so hard and not bedded at all so the luck involved in this being broken out like this is staggering! Not sure of the ID of the tooth but think it may be a Petalorynchus sp. Its 19mm from the tip of the crown to the end of the extremely long root. This was the first thing I picked up, a small stromatolite that had weathered out of the formation almost perfectly intact.
  14. Hank

    Please help identify

    Is this possibly stromatolites? Found just north of Golden Shores, Arizona, in a dry wash in loose material on the bank of the wash. Thank you for any help, very new to collecting fossils.
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