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  1. Any ideas? All found on the Nueces Riverbed in Texas.
  2. Baking Geologist

    Tackling a Specimen in Dolostone

    I am wanting to tackle extracting whatever this dark fossil is. But I’ve done very little fossil preparation (other than dissolving stuff with HFl but that’s a story for another day). This is from the Racine Formation from Quarry Park and I picked up a bunch of other pieces to work on for practice. I’m not used to handling dolostone. I grew up with the Mississippian of Indiana, specifically Bloomington-Bedford area. Any suggestions welcome.
  3. Balance

    Peace River mystery rocks

    Hello, hope everyone is doing well here on the geology channel. Found these in the peace river in Florida, US. was hoping someone could shed some light on these two items. The numbers are from my trip journal entry so I apologize that they are randomly numbered here. Thanks Jp What type of rock is this? Basically these grab my eye as fossils or teeth and when wet they are even more deceiving. As you can see inside is pure and it’s encased in this darker shell. Any info would be appreciated. It’s actually pretty neat but I’d also like a name to call out before I cus at it and throw it back out next time. Im calling it “pound cake” geology for now. Beautiful Strange There are lots of these. Finally decided to bring one home and investigate. Couldn’t cut it with a masonry disc and grinder so I just popped it with a hammer. Any ideas? raw and polished out - last image shows the texture and finish of the stone after fracturing and without any polishing.
  4. Identification help requested! In presumable Burlington chert (Mississippian: Tournaisian/Osagean) of east-central Missouri (Lincoln County), USA, I recently came across a mostly moldic chert specimen of what must be a bryozoan, but I do not know what early Mississippian bryozoan would possess such a robust axis devoid of zoœcia, as in the later Mississippian Lyropora. At first I was not even sure it was the bryozoan’s own axis but instead thought the bryozoan was somehow associated with an orthoconic cephalopod. Each photo below is paired with its optical inversion to help visualize what originally filled the mold. Scales in mm. The main reason I feel confident that this whole structure is bryozoan is thanks to a colleague’s find of a presumably related unidentified bryozoan, also in moldic chert presumably from the Burlington Formation but from southwest Missouri, that shows the axis and its texture much more clearly than mine. Here is that specimen, again with inversions. Again I have no knowledge of an early Mississippian bryozoan built like this. (Yes, the axis surface texture looks quite a bit like the texture along the genal rim of some Mississippian trilobites! But it also resembles undoubted bryozoan textures I’ve seen.) Identification help requested! Thanks.
  5. LPaden

    Rock and fossil hound from MN

    Hello, thank you for having this forum to ask questions. While pulling weeds recently in the rocks surrounding where I live, I came on this piece. Initially I was intrigued by its shape. I’ve studied it to the best of my ability and now request your help. Google photo brought me to a woman who had posted on here a photo thought to be a bone fossil. Forum members suggested it actually be a piece of chert. Looking up chert is says it often registers at 7 on Mohs hardness meter. This piece registers at most a 4. I’m intrigued by some of the quartz lines that appear on the surface. Thanks for taking a look.
  6. Rockwood

    Sponge ?

    This was found on the spoil piles at the Mazonia wildlife management area in northern Illinois. I forgot to include a scale, but the piece measures 6cm x 5cm x 4cm. Can I toss it as a chert nodule ? Or is there a chance it's a sponge ?
  7. This is one of the things I received from a rockhound club member who was getting rid of stuff, which I showed off here: She did not recall anything about this piece, and I think the 'petrified fern' label is wrong but I was given nothing else to go on to track down its true nature or location of origin. Does anyone recognize it? It doesn't seem to have the rings that you would see in pet wood except for the Chinle Fm stuff from AZ which is so altered that often the grain is invisible. But the broken faces exhibit some odd little flat bits in cross-section, and there's that interesting cross-hatched texture that I hope give some clues (and the orangish color is similar to Chinle also..?) She has been all across the US and Canada, and Britain as well (originally from England) so that doesn't allow me to narrow it down much. The collection also included some stuff from Ginkgo Petrified Forest in Washington, and Eastern Oregon, and of course pet wood can come from many places, if that helps, but the only safe bet I would say is somewhere in the Western States. Just hoping someone recognizes the material as being from a specific site/formation.
  8. Wrangellian

    Mystery river rock - fossil or no?

    My aunt found this on the Chemainus River recently. Usually I can tell if something is a fossil even if I don't know what kind of fossil, but this one has question marks all around it. The rock looks like flint to me (at least chert - we have lots of chert around here but actual flint is not something we see very often here on Van Isle, so I'm not sure of that either). As you can see it is in the process of being sliced, so there is one cut surface to look at there, opposite the one that is glued to the wood block (pics 3 and 5). The glossy look is partly due to the rock saw oil still covering it. It is quite fine-grained in the 'bubbly' looking area anyway. Is there any sort of fossil that could account for the 'bubbles'? (e.g. sponge, radiolarian...? - just shots in the dark), or is it purely geological? Do I need to get microphotos of the inclusions for an ID? (That could be difficult - I could try a macro lens on the camera).
  9. 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 opinion at the time)...I wondered if it might be a fossil...a big Brach maybe? Photos courtesy of the Google ...unlikely After seeing close-ups while cropping the pics to post here, I thought, "Hmmm...I got wood?"... It kinda looks like petrified bark to me now, but its "grainy or veiny" on both sides, which seems strange, to me, for a piece of bark... Probably purely geologic combined with wishful thinking...it happens...although, if it is geology, it would be cool to come across a Genisis Jasper where it should not be Photos courtesy of the Google ...ooops...doin' it again...sry Anyway, either way its a beautiful specimen with an interesting story... Any ideas or opinions?...thoughts will be greatly appreciated...thanks in advance... Have a nice day
  10. Geojonser

    Chert fossils, inclusions

    Hello After doing some reseaech on some big Chert nodules given to me...I went back through some Chert that I found along the northern North Sea coast of The Netherlands... I really like Chert...I have always been curious about mineral inclusions and/or fossils in Chert...I am having trouble finding laymans info on the subject...the info I do find is a bit overwhelming... Im hoping someone could help me out identifying some of the things that I am seeing in my pieces...I have pointed to points of interest to me... I have posted the photos twice...one in natural light and the one darkened...all the same stone...4" x 3" (10x7.5cm) I see lots of pattern in these pieces...Plant, animal, bubble, scratch, fracture?...too much info...Im unsure... This next photos are interesting to me because the area that I point to (this?) is the outside of the nodule and the grouping of grains (?) Seem to me to possibly be some of what I am looking at on the broken and, by nature, polised sides in the previous photos... The next photos are of a different piece of Chert that had been painted...I am a bit weary about using paint remover on it...concerned about discoloring it...I wiil experiment on a flake later... Anyway...also 4" x 3"... next are 2" x 3"...same side at two different angles... I appreciate any help identifying the "spots" in these two stones...if someone knows a link to a "identify-stuff-in-chert/flint" resource for a lay-person, that would also be greatly appreciated... Thanks in advance for your time
  11. Alexander D.G

    What are these 'stalks' on this geode?

    Hi all, I found this chalcedony geode on the Nordmany coastline. After later inspection i found these 'stalks' all over the geode, i assume it's a plant fossil. Could anybody tell me exactly what it is? They are quite small, the one in the second picture is 1 cm long. Thanks in advance!
  12. 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.
  13. I found this along the Fox River in Elgin, IL. At first I thought it was a stromatoporoid fossil (I find them everywhere in this area), but upon closer inspection I couldn't see anything that looked like pillars or laminae. Someone suggested chaetetid sponge, or a stromatoporoid that was distorted by silicification. I can't find any photos that look like my spec. except dino bone and we don't have those in northern Illinois. Is it a natural formation, crazy looking oolites? I'm totally stumped! More pics
  14. rockhound420

    Is this chert or fossil?

    I'm having a hard time accepting that this may just be chert, can someone help?
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