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Found 118 results

  1. Colorado Cretaceous - Fox Hills

    From the album Sharks and their prey ....

    Carcharias sp (?) Cretaceous of Colorado Fox Hills Sandstone

    © © Matthew Brett Rutland

  2. ferns and urchin

    Hi everybody, i recently made an exchange and so i received those ferns, all i know is that they come from Colorado, i have no other clue about them. I also received an unknown urchin and have no clue about it. Could you help me know a bit more about them ? The longest diagonal of that piece is a little less than 15 cm, the base is about 13 cm and it is about 11 cm hight. @Plantguy @paleoflor ?
  3. Dinosaur Ridge

    This is in the rocks near labeled dinosaur bones at Dinosaur Ridge, west of Denver in Colorado. When I took the photo I just assumed it was a transsection of a long bone. I've become less certain of it each time I look at the photo though.
  4. I found this and i have been trying to find out what it is. Is there anyone that can help me out?

    Hello guys! Happy new year to everyone! Saw this interesting fossil listed as a rare fossil bird feather from Parachute Creek, Colorado. Here are my questions 1. Is it really a fossil feather? ( I was thinking more like some kind of seed but It does look a lot like a feather) 2. If it is, is it really a bird feather? What else could it be? Really Appreciate the help, here are the only pics I have. Cheers!
  6. Allosaurus sp.

    From the album My Collection

    Allosaurus sp. Morrison Formation Upper Jurassic Moffat County, Colorado Size: 6cm
  7. A new paper is now online that will shock you: Carpenter, Kenneth. 2018. Maraapunisaurus fragillimus, n.g. (formerly Amphicoelias fragillimus), a basal rebbachisaurid from the Morrison Formation (Upper Jurassic) of Colorado. Geology of the Intermountain West 5:227–244. Despite the missing nature of AMNH 5777, Kenneth Carpenter has erected Maraapunisaurus for Amphicoelias fragillimus and reclassified the taxon as a rebbachisaurid based on comparisons of Cope's figures with illustrations of other rebbachisaurid vertebrae. He's also revised the size estimate for fragillimus to 99 feet because Woodruff and Foster (2014) consider a 190 foot long Maraapunisaurus biologically impossible; even with this revised length, Maraapunisaurus was still a huge sauropod compared to other rebbachisaurids. This new size estimate makes sense because Diplodocus hallorum was initially thought to be 140-150 feet long before later research revised the length of D. hallorum to 110 feet, but also because also because of a lack of research into the biological limits of gigantism in sauropods. Given the discovery of the rather early dicraeosaurid Lingwulong, the rebbachisaurid placement of Maraapunisaurus shortens the ghost lineage of rebbachisaurids created by what is known about early diplodocoid evolution in the Jurassic.
  8. Find du jour!

    During what I like to call the fossil hunting off-season for folks up in New England you sometimes manage to find something sitting beneath your nose ever since you first found the piece. (i.e. a tooth or shell you missed in a conglomerate or an odd little vertebra you forgot you found at a microsite etc.) This is a similar case where it was only today that I found this tiny insect in some of the material I brought home this summer from Douglas Pass, Colorado (Green River fm. parachute creek member). I hadn't noticed the front of the body and legs until a few hours ago when re-examining the leaves and bugs specimens I picked up from the locality. After carefully picking away at the somewhat flaky matrix the rest of the body was revealed. I want to know what you think its identity is, my guess is mosquito or potentially mayfly. Thoughts? The length is about 3 mm from head to abdomen.
  9. Fossil dragonfly for ID please!!

    This piece is exhibited at Royal Belgian Institute of Natural Sciences and the label only says: Odonata indet. Colorado, USA. But no data about age or formation. I think that it must be related with some Euphaeidae like Litheuphaea that have similarly patterned wings and also comes from Colorado. I need help in put a name to this piece please! Thanks!
  10. I found this fossil as a doorstop at a retirement home in Centennial Colorado. Could not believe it was a doorstop. The former owner had moved into the Alzheimer's unit and left it behind. No background on it AT ALL. Sorry about that.
  11. What is this?

    I found this while going through part of a dry river bed. It’s near Colorado Springs, CO. It’s a little smaller than a dime. Could it be a crinoid AKA Indian Bead? That’s the closest looking thing I’ve found thus far.
  12. Florissant spider id ?

    All, My son found this orb-weaver spider at the Florissant Fossil Quarry in Colorado last month. It's about 1.5" (4cm) between the tips of the longest legs. There are short thorns on the abdomen, and possibly on the bases of the legs as well. Overall, it's very much like the golden orb-weavers whose webs I have the occasional misfortune of walking into in my garden. Can anybody tell me what genus, or perhaps even species this may be?
  13. Colorado Finds

    My wife and I took a four day trip to Colorado over Labor Day and we were on the move constantly, trying to take in as much scenery as possible. OF COARSE, I had to do a little collecting along the way. As I looked at various rock formations, it quickly became apparent that I was out of my comfort zone. This wasn't Minnesota Ordovician material. I do have a mix of unknowns, both mineral and fossil to present for ID but let me start with these 2 samples collected near the Ammonite Research Site in Kremmling, Co. The first item was a brownish "thing" that I threw into my backpack to check out later. It really didn't look like a collectors piece. But when I examined it at home a little cleaner and closer up, I was astounded to see these blue streaks. Any explanations???? If I didn't know better, I would have guessed heart vessels. And yes the blue is that blue in real life.
  14. Florissant Finds

    Much has been already said about Florissant, so I’ll be concise with my words. 34 MYA, lake environment, ash fall, pay dig. Controlled hunt: they dig and dump piles, you select chunks and split them at picnic tables. Not the death defying adventure I crave, but fun to do once, fill a Riker with common finds, and say I’ve been there. You can buy the same rock and have it shipped to you, but since we were in the area, I prefer the on-site experience and selecting my own rock from the piles. Hint: Skip the blocky and/or grainy stuff and target the thinly laminated, shaly stuff that is beginning to split on its own. If you see black organic matter, even better. Exploit those planes. A montage of pics follows.
  15. I found this listed as a Stegosaurus stenops ischium (looks like a left illium to me) found in Moffat County, Colorado. It looks mostly real to me, but definitely has some restoration in two places (marked in red) (edit: the smaller area looks like it might be only one side). Is the rest of it all real, or am I missing anything? Something about the area between the restored areas looks slightly off to me, though I lean a bit toward real on that. (edit: removed question on value) I would of course prefer something with no restoration, but Stegosaurus fossils are awfully hard to come by.
  16. Denver Colorado Fossils

    Hello everyone, I will be in Denver in early October, and I was hoping to spend at least one day fossil hunting. Is there anyone here who would be willing to give me some tips. This is my first trip west of the Mississippi River and I probably will not be back for years, or possibly ever, so I obviously won't pick any sites clean. I am a vertebrate guy, so that is what I am hoping to concentrate on. Any help or tips on where to go and what sorts of fossils I can find would be tremendously helpful!
  17. Help iding some morrison bone

    Have had these two for a while from brushy basin of the morrison in western Colorado i have two questions one is what could this have been i tried to id it for a while only think i could come up what was a sauropod metatarsal and two ive had someone tell me the the lines on top of the bone are bite marks but wanted to see what everybody thought .
  18. Allosaurid

    From the album Dinosaurs and Reptiles

    Morrison fm, Moffat county, Colorado 1.6 cm tall
  19. Marshosaurus?

    Recently acquired this very nice tooth from Morrison fm, Moffat County, Colorado. I think it is Marshosaurus, am I right? I am afraid to clean it right now because the tooth is very fragile. Total length is ~1.6 cm. Ruler is in inches, so 1 line=1/16 inch=~1.5 mm, so distal serration density looks to be around 4/mm; mesial carina seems to end at bottom ~3/4 of the tooth, as I understand, these are Megalosaurid characteristics. Although I couldn't find any info on other medium-small sized theropods, like Tanycolagreus, Coelurus or Ornitholestes. Thank you for help! @Troodon By the way, took those pictures with AmScope USB microscope, very useful tool for detailed teeth
  20. This was found near Douglas Pass In Colorado. The imprint is just under 3 inches point to point. I am having a hard time figuring this one out. The shale is from the same formation as Florissant Colorado from what I understand,
  21. Due to deeply discounted air travel , my wife and I decided to take a spur of the moment vacation to Colorado, a state I have never been to. We will plan on visiting Florissant and Douglas Pass for sure . I am open for other suggested fossil or mineral sites off the beaten path or special photographic spots that would be worth checking out. We will travel from Florissant to Grand Junction via Rt 24 and Rt 50. From there, we will loop back to Winter Park via I 70 and Rt 131. It is a 5 day trip so a little deviation from this itinerary is possible. Any suggestion will be truly appreciated and will help to make a wonderful vacation that I can share with TFF. Mike
  22. A few IDs from recent trip out west

    Hi all! I returned from my trip out west a few days ago and wanted to have some fossils identified before I do my big recap of my experience and my photos from the field. Here are some specimens I found of which I'm not certain of their identity. (This will not be my last post of this type from this trip). 1. Small theropod tooth (Richardoestesia sp.?, Acheroraptor temertyorum?). (There appear to be serrations on the front of the tooth but the majority of them seem to have worn off or did not extend further than midway through the tooth). (Near Newcastle, WY, Lance Fm.). 2. Turtle/Croc toe bone? (Near Newcastle, WY, Lance Fm.). 3. Larvae? (Douglas Pass, Green River Fm.).
  23. Road trip fossil hunting

    Hey everyone! My brother and I are doing a bit of driving today and we're looking for places to stop and stretch out out legs and hunt fossils. Were driving through Moab, Utah, on to Durango, Colorado, through Pagosa Springs, down towards Taos, and towards Red River. Anyone have any suggestions?
  24. ATrip to Wyoming

    Hello, I’m a new member and a novice fossil hunter. I’m headed on a trip thru Colorado, to southwest Wyoming, and then down southern Utah. I know about the pay sites in Wyoming, does anyone have any suggestions fossil sites from central thru northwest Colorado, and eastern Utah. Sorry if this is a pretty broad question.
  25. No clue first fossil Colorado

    Any idea what this is? Found it in Colorado Springs CO.