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  1. In Colorado there is a formation called the Dawson Formation also known as the Dawson Arkose Formation. The most common fossil by far is petrified wood and although I haven’t found any vertebrate fossils from dinosaurs and mammals have been found. It covers a relatively large time span from late Cretaceous to early Eocene, about 70-54 million years old. A member that has also found fossils in this formation, Blake @FossilDudeCO. Although it has been over three years since he was on his posts have still helped. He said that further south is Eocene but higher north in Parker and Aurora is Cretac
  2. I found this today on private land while hunting for calcite SE of Denver Colorado. It was in a gulch mostly buried by sand that is very quartz heavy. Please help with ID! It is very heavy!!!
  3. I just got back from an amazing and very fruitful week of fossil collecting on the White River Formation in northeastern Colorado. The White River Formation is a very easy and fun rock unit to collect vertebrate fossils on. The White River Formation was deposited during the very latest Eocene and the early Oligocene, though the faunal diversity in the areas I was collecting on suggest it was laid down during the Orellan North American Land Mammal Age, which centers on around 33 million years ago during the Rupelian age of the Oligocene Epoch. I am very lucky to have a grand uncle
  4. Well with the last year of moving and renting and moving again, I haven't had much time to do much of anything on the fossil front. The Pictured Cliff Sandstone formation, Late Cretaceous near Durango, Colorodo. Spotted these large rock faces with ripple marks and decided to be a geology nerd and scramble as far up the slope as possible to snap a few photos. These ripples were likely deposited at the edges of the Interior Seaway, Late Cretaceous. In 10m of water. At least, that's what the paper suggests. (Depositional Environments of The Pictured Clif
  5. I've always wanted to visit the Florissant Fossil Quarry due to my interest in paleoentomology but for one reason or other, I was never able to make it out there. I was finally able to make a detour out during a roadtrip returning from a funeral last week. There were beautiful calm skies, which was lucky too since heavy rains were forecasted for the next 2 days. After a good 5 hours, this is what I had to show for my efforts: Most pieces will have unidentifiable organic smudges. Aside from that, small leaves are the most common readily recognizable fossils. I am a terrible botanist
  6. I have a few really nice fossils from the White River Formation of northeastern Colorado that I need to prep, and given I am a beginner at fossil prep I would really like to gain some advice and guidance from people with experience do I don’t accidentally damage the fossils. The first fossil is an Oreodont skull. The skull is mostly intact, and I was able to extract it from the field without using any glue or stabilizer or consolidant or anything like that, so this fossil is in its “natural state.” The zygomatic arch and upper tooth row are crumbling, but
  7. Maria814

    Is this a fossil?

    Hello! I found this in Fruita, Colorado while doing some remote field work. I have no idea if it’s a rock, bone, or fossil. Was wondering if anyone could help! Thanks!
  8. yardrockpaleo

    Florissant unknown (fish scale?)

    Hello everybody! I have another U.F.O here (Unidentified Florissant Object) and to be honest, this one has really stumped me! It isn't a carbon stain, it isn't one of those pumice chunks 'fireballs' that are common at Florissant, and it has a strange texture and shape. Weirdly preserved petrified wood? That is my best guess as of now... @piranha @Top Trilo @Tetradium The fossil is 1/2 an inch long. The first 2 pictures are the fossil by itself and the third I circled it. The rest are microscope pics of the texture. Pics 5,6, and 9 show the edges. 7 shows the top.
  9. Wasn't sure to put this in this forum or Documents so move it if needed. I was wondering if anyone can show me an online document about the Manitou limestone or Manitou formation, trying to learn more about it. Thanks again.
  10. LurkingGargoyle

    Possible Fossils in Creek Bank; Colorado USA

    Sorry, I hope this isn't making multiple posts. I'm having trouble submitting (I was previously pasting images inline instead of using the "choose files" function). We were exploring a creek outside of Denver, Colorado USA. There was a newly exposed bank about 2.5 meters (8 ft) high. At the bottom was about 1/2 meter (2 ft) of grey clay. We pulled a large clump of clay out and dissolved it in the water. Inside were two possible fossils. We have no idea what we're looking at and have zero experience identifying fossils. Any help is appreciated. Item #1: This looks like a bone, we're
  11. Found123

    Fossils from Colorado

    Hi there, We recently moved to the Colorado Front Range from Michigan. We’re used to hunting for petoskey stones on the Great Lakes. Here are some of our new CO finds and we’d really appreciate any information! thank you so much! We are so excited for this new land to experience.
  12. Hi Everyone! My family and I are going on a trip to North Colorado this August and I really want to collect and keep some dinosaur fossils while I'm there. Does anyone know of a program, charter, or guide who can help me? It doesn't have to be in Colorado, I'm close enough to Wyoming that that is also an option. I tried looking for something on my own and all I can find is either parks where collecting is forbidden or what is basically "pay us two grand to be our field slave for a week".
  13. fossilsonwheels

    Cretomanta ?

    I found an interesting fossil in my Mesaverde formation matrix yesterday. It has me scratching my head a bit. At first I thought it was a Sawfish rostral but after a bit of research I am not sure. I think it looks like Cretamanta possibly. It is the right size at 1mm. I had had some difficulties with the equipment at work today so I only got one decent picture.
  14. kevindl30

    Large Molar Tooth

    Out walking near Denver CO today and stumbled across what looks to be a large tooth. Can anyone help me understand what it might have come from?
  15. fossilsonwheels

    Mesaverde Formation Round 2

    I have been a little bored lately and missing micro matrix searches. It’s been awhile since I’ve gotten to enjoy hunting for tiny shark teeth. I got some more matrix from the Rollins Member of the Mesaverde Formation. My first time through that matrix produced one of my favorite finds, a 1mm Scyliorhinus tooth. This formation doesn’t provide much in the way of complete teeth but it is a fauna that was really quite diverse. The first search was with less matrix but I found enough to want to do it again. This time I have more matrix and in varying states. Some is broken down, some i
  16. FossilHunterNYC

    Morrison Formation

    This apparently came from dinosaur monument in Colorado. Are the dark areas bone fragments?
  17. fossilsonwheels

    ID help with some Cretaceous Shark teeth

    These will all be from the Mesaverde Formation, Colorado. First up is a 1mm tooth that sure looks like an anterior Heterodontus tooth to me. I am open to any ID suggestions but I see a lot of similarities with the Atco tooth I recently found.
  18. BellamyBlake

    Torvosaurus

    I have here a theropod tooth tip from the Morrison Formation of Moffat County, Colorado. It's 1/2". The claim is that it's Torvosaurus based on the serrations. Is that a definitive way to identify this as Torvosaurus as opposed to another theropod? @Troodon Thank you, Bellamy
  19. HuckMucus

    Plant or?

    I found this on my place which makes no sense. I'm on a whitewater mountain river with gravel, rocks, boulders (granite). Most non-granite rock comes down from above and it's worn. This doesn't appear to be river-tumbled. The thing in it caught my eye and reminds me of wood but I'm not sure. Any ideas?
  20. HuckMucus

    What should I look for?

    I'm thinking on a trip to a spot where I saw a bunch of sea shells south west of La Junta, Colorado. I'll be prying rock layers apart looking for stuff that strikes my eye. However, is there anything in particular I should be looking for that would be a real score? I think the picture is the stuff if I have my dates right. Thanks.
  21. PaleoNoel

    Florissant Leaf- Cedrelospermum?

    Hi everyone, I wanted to confirm the identity of one of the leaves I found in Florissant, CO back in 2017. At one point or another I saw the genus Cedrelospermum pop up on here or instagram associated with a leaf which caught my eye in its similarity to my own. I would be interested in seeing your opinions. compared to images I found elsewhere online
  22. HuckMucus

    Fish Scales

    I know there is not enough to ID but thought I'd share. I used to hike the oil shale cliffs behind the Job Corps Center out of Colbran, Colorado, back in the 70s. The size of the scales on this fish were such that I knew it would be a keeper if I caught it. The oil shale there is such that you can actually light it and it burns. (The little one on the right I found out of Eden, Wyoming, sometime in the 80s).
  23. Billymachi

    Animal or Vegetable?

    This is a rock shop purchase. The owner is an expert in dinosaur gembone from the Morrison. He also deals in Hermanophyton ferns, etc so he also knows a bit about paleobotany. But this piece was a mystery to him. Its very well agatized and the fine details are preserved. At first it looks like a limb cast. The exterior is coarsely wrinkled, like bark. The cross-section does not preserve a convincing ring of a bark layer, but there is some kind of concentric character. It has some characteristics of a limb bone. The geometry and size fit that t
  24. Amanda88

    Coral in Colorado?

    I found this in my backyard. Is it fossilized coral? western Colorado
  25. Kikokuryu

    Ceratodus sp.

    Stabilized with Butvar B-76. Found in a basal channel facies associated with an incised valley-fill sequence of fluvial sediments; found in situ from a channel-sand-bed-load layer near the base of the valley-fill sequence. Edit: So, I copy pasted that from my power point I use to catalogue my fossils. Not sure how to remove the boxes.
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