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Found 21 results

  1. I’ve been interested in biogenic influences on minerals for a while. I have a large collection of stromatolites/oncolites/microbial mats etc. where algae influenced the minerals. I also have hot spring and cave minerals that were also influenced by biogenic processes. However, a new book, shown below has opened up a whole new class of Biominerals mostly influenced by nano bacteria. A lot of the theories in this book are at the forefront of science and are not yet mainstream or even accepted in some cases. However, I thought it was definitely worth a few posts here on TFF.
  2. SilurianSalamander

    Unknown Paleozoic echinoderm

    Crinoid calyx or echinoid? Found in gravel with Ordovician-Devonian fossils. About 2cm across at the widest point. Druzy coating over the fossil which seems to be an external mould. In orange jasper. Thanks so much!
  3. Geojonser


    I found this piece while walking along a building in Northern Germany...first I thought, "Huh?...this looks out of place"...I thought it was just a weather-worn veiny stone...Then I picked it up, saw the fractures and thought, "Wow!, what a nice piece of Chert or Chalcadony (va. Jasper) what are you doing here?"...The fractures are heavily weather-worn, conchoidial, opaque and with a dull luster... After a while I began thinking that the shape, weathering and banding/striping was a bit unusual (mostly opi
  4. SilurianSalamander

    Agatized trilobite cephalon?

    Found in Michigan LP. Devonian age probably? Loads of corals and other agatized fossils wash up on that beach. This is the only one I’ve found like this.
  5. Ren_Iain

    Fossil find in Yellow Jasper

    Found this in the ‘Golden Gravel’ in our garden. Source unknown as it was here when we moved in and rock ID’d (using an app) as Yellow Jasper. The closest thing I’ve been able to find for the fossil is Hamulina or Toxoceras (last image), but not been able to find any mention of this being found in Jasper. Any ideas?
  6. I've noticed that despite finding loads of petrified wood deep in East Texas (around Jasper, just east of Lake Sam Rayburn), I've never heard of any vertebrate material being uncovered in the area. I specifically spend a lot of time hunting petrified wood on the catahoula formation ( which is Oligocene) when I'm there, and there's definitely no shortage of said petrified wood. If so many trees are fossilized, shouldn't there be fossils of the animals that lived along side them too?
  7. Hello TFF, I purchased this relatively inexpensive specimen at Mineralfest this past fall, and I was wondering if anyone could tell me more about it. The seller informed me it could possibly be from Madagascar, but was transparent in admitting that she couldn't confirm for sure. It was with other pieces of petrified wood that were brown, but I was drawn to this one due to the red hues. I think it's agatized, and it looks "glassy," although there are too many impurities to shine a cell phone light through it. One side is polished, and I put water on the rougher backside to show mor
  8. Tetradium


    From the album: Platteville to Decorah formation Ordovician Twin Cities

    Yesterday I went on first fossiling trip of the year. Its one of a pretty small timeframe in which I am able to accessible certain sites as thaws are happening but marshlands are frozen. Two years in row found a sizable agate in very different locations - last year was on a sandy road recently constructed up north Minnesota. This agate (right side) is hardly chipped. The left side is typical twin cities glacial deposited japser - certain sites far north Minnesota produces superior quality jaspers by compare. This one is much more smooth on one side and more redder than usual
  9. boomershouse

    Rock, mineral type need help

    I keep running across this rock or mineral not sure what it is. Number one has a miniature cavity/geode.
  10. The Mushroom Whisperer

    Fossil bone or interestingly shaped jasper?

    Hello everyone, I found this in Washington State, Pleistocene, near Mason County. Suggestive piece of jasper or fossil bone? And I apologize for not using metric. I couldn't find my other measurer... Your thoughts would be appreciated. Chris
  11. Mykkhul97

    Is this Stromatolite

    I am not sure what it is. Maybe Stromatolite? Dense piece. The coloration looks like it with the red.
  12. A few more samples from another area near Fallon, NV I believe is Petrified Wood or other? Thank you.
  13. Trilobiting

    Fossil ID

    Yesterday, I visited the famous Moenkopi Dinosaur Tracks site. The lady to guided me pointed out shiny rocks, which she said were jasper fossil corals. She let me collect them while I was being guided. I'm sure the pieces are jasper, but I'm not sure of they're pieces of coral. Are they? In addition, there were some other things she pointed out, such as dinosaur eggs, skulls, coprolites, and vertebrae. I already knew these were suggestively shaped pieces of sandstone. I'm sure this misinformation wasn't on purpose, though.
  14. Jdeutsch

    geology question

    I was in an agate field in South Dakota just south of Badlands Park. Cretaceous era. I collected a few not-so-special agates and some jasper, and the pictured rock, which I thought was wind polished jasper- but it broke and had what looks to be brachiopods inside. I assume this is sedimentary or metamorphic. What is the relation between the agates in this region and the kind of specimen here? Why are there so many agate fields in this area of S Dak?
  15. winnph

    Petrified wood?

    I found this on a beach on Puget Sound the other day. The parallel grain caught my eye as possibly petrified wood, but there are tons of various jaspers and agates and such on the beaches here, so it's hard to be sure. I took photos from a couple angles after I'd sanded a couple faces lightly with sandpaper. Thoughts?
  16. Naughtistic


    From the album: Naughtistic fossils and rocks

    Another picture of a chunk of jasper
  17. Naughtistic


    From the album: Naughtistic fossils and rocks

    One of many pieces of jasper I collected on The North Saskatchewan River
  18. A few months ago, I traveled to Jasper, Texas for a family event. On the drive home, I took a side road about fifteen minutes North of Jasper and found a creek that looked interesting. The creek was flowing well, and there was a lot of material in the creek bed with water rushing over it. The attached pictures show specimens that I collected from the creek that day. From the locale and appearance, I had thought these to be Palmoxylon. However, in looking at numerous online images, I wasn’t able to find any petrified palm that looked quite like these samples. I’m thinking that this may ju
  19. Phillyrockhound

    Costa Rica Trip Nov. 2014

    Just returned from the wonderful country of Costa Rica. The trip was to celebrate my grandmothers 80th birthday! Being this was a family trip, I had limited time for any "back country" explorations, missing too many suppers would not have gone over well!! So I decided I would take day trips to as many beaches as possible, and consider all info collected for a future trip if anything really caught my eye. We were staying in a villa in Manuel Antone. I walked the local beaches all the way up to Quepos and paid special attention to low tide coral that would trap anything washed up. The current
  20. Got some samples of things you can find in the ever-shrinking Neosho river banks. Is that a crab and tooth concretion? And what's the impression of? Can anyone help with ID on the rocks too?
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