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Found 23 results

  1. 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 pa
  2. 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.
  3. lewcharles1


    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?
  4. 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 pos
  5. 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.
  6. 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 att
  7. 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.
  8. 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.
  9. 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 det
  10. 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
  11. 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.
  12. Geologists Question 'Evidence Of Ancient Life' In 3.7 Billion-Year-Old Rocks, NPR, All Things Considered https://www.npr.org/2018/10/17/658103489/geologists-question-evidence-of-ancient-life-in-3-7-billion-year-old-rocks "World's Oldest Fossils" Might Actually Be Simple Rocks, And We're Here For The Drama, Carly Cassella, Science Alert https://www.sciencealert.com/doubt-raised-over-current-record-holder-oldest-fossil-sign-of-life The paper is: Abigail C. Allwood, Minik T. Rosing, David T. Flannery, Joel A. Hurowitz and Christopher
  13. Himmler, T., Smrzka, D., Zwicker, J., Kasten, S., Shapiro, R.S., Bohrmann, G. and Peckmann, J., 2018. Stromatolites below the photic zone in the northern Arabian Sea formed by calcifying chemotrophic microbial mats. Geology. https://www.researchgate.net/publication/323211798_Stromatolites_below_the_photic_zone_in_the_northern_Arabian_Sea_formed_by_calcifying_chemotrophic_microbial_mats https://www.researchgate.net/scientific-contributions/74385017_Tobias_Himmler https://pubs.geoscienceworld.org/gsa/geology/article/528309/stromatolites-below-the-photic-zone-in-the
  14. Hi y'all, Here are the finds from 3 separate half day trips to Post Oak Creek during the first weekend of Feb and from last Saturday. One of those days was spent hunting a new to me part of the creek that seemed to have more trash and glass than fossils. That day I decided to make a move to a more productive part of the creek to collect some gravel that I had promised my nieces so they could do some fossil hunting at home. Also I collected some for myself. Last Saturday @Buffalo Bill Cody and I went hunting. It's was warmer and I noticed several bass swimming in the creek. I
  15. @Raggedy Man and his "phantom" wife, Laura, came up to fossil hunt for her 31st Birthday and what a hunt it was! I was busy the first day they were here with my little Airbnb Whispering Winds checking people in and out but they had a wonderful day hunting and Paul found a Bumastis trilobite - they are trilobite hunters. He will have to post his pictures. :-) On Saturday I had invited new fossil friend, Todd, from the Twin Cities to hunt with us. He had come on a paid hunt earlier (he left with 2 5 gallon pails of fossils that very long fossil hunting day) and we had bonded and this was a
  16. Slide 1 I recently started reading up on stromatolites after I learnt that we have stromatolite formations and living tufa cyanobacteria colonies in the rocky beaches of Port Elizabeth, South Africa. The cyanobacteria found here are unique, their habitat is the semi-freshwater pools where freshwater from springs meet the sea where they line and grow on the submerged surfaces of the pools. The stromatolites have irregular forms and my observation is that quite often they are concave plates opposed to the more well known dome shaped forms. Here is a photo I took at Schoenmakerskop this morning.
  17. Well, on this trip we didn't actually hunt for anything (the signs and route were pretty apparent and no collecting was allowed), there were technically no fossils (though stromatolites predate most other life forms and have been inhabiting the planet for some 3.7 billion years), but you can't deny it was a trip so, though only scoring one out of three, I'm posting this in the Fossil Hunting Trips section. It was quite a trip and one I've had on my bucket list for some years now. I've visited (even dived, surveyed and sampled) the living stromatolites in Lee Stocking Island in the Bahamas and
  18. Rockwood

    Could they be ?

    Found in a glacial deposit here in Maine. They could be any where from mid Cambrian to mid Devonian. These shapes could even be volcanic. They don't react to vinegar. My thought is that they may be chert replacements of stromatolites.
  19. Clueless rockhound

    Looking For An Id

    looking for help with an ID. found this in western WI near the Mississippi River. A lot of Sandstone around... could this one be a stromatolite agate?
  20. I was doing some rock hunting in in the desert, about the center of Utah and found these strange rock formations in the Mancos Shale of the late Cretaceous (Utah has plenty of strange formations). But these caught my eye because of spacing and alignment. When I looked closer it look like a fine sandstone with a few shell fragments, I thought of Stromatolite but did not see any laminations, When I was able use the internet I found out about Thrombolites and I am fairly sure that's what they are. The formations stretched for over a mile. A closer look
  21. I've always wondered why many specimens are extremely colorful. Many seem to be unrivaled in terms of color with other fossils. Any thoughts?
  22. ediacarinian

    Fossil Worm Burrows?

    This photo was taken of a rock that was found among Stromatolite fossil beds. Do you think that it could possibly be fossilized worm burrows? If not then what is the likely lighter sediment colour derived from?
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