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Found 218 results

  1. Hello! This is a small fossil from the White River Formation of Weld County, Colorado. To me it appears to be a set of front incisors rooted to a small piece of the maxilla or mandible. There are no teeth or tooth sockets next to the two that are there, and so this makes them look like the two incisors characteristic of rodents and lagomorphs. Interested if anyone can tell me anything else about them. Two photos are through a stereo dissecting microscope at 20X magnification, the other two, though blurry, should give a sense of scale. The entire fossil is about 9 mm tall, with the tooth crowns themselves being about 4 mm tall. Thanks!
  2. Fremont Butte Co. Maybe more pics

    Hey everyone, Have a buddy who went to Fremont Butte in Colorado. He hauled the picture out. Now, I know you will probably need more pics, any chance it is an egg cluster.
  3. Florissant Fossil Quarry - Colorado

    Well, I'm in my new habitat out here in Colorado, and while I miss dearly a good paddle on the river and my fossil hunts in the mud and sand, I had to make a trip out to our local spot at the Florissant Fossil Quarry. The kids seemed to dig smashing shale (it lasted about an hour), and the technique actually yielded our first decent leaf fossil. The shale smasher .. in disguise !! Dad, wanted to take a lighter approach and we did come home with a large bag of shale and some plant and insect specimens. I'll post some of those in this thread, eventually when I scan them. Splitting the shale you will often come upon Reaaaaly tiny insects that my failing vision has a hard time catching. This winged insect (a mosquito ?!) had bits on each side of the rock so I scanned and composited him in Photoshop. Didn't turn out too bad. I'll let you know what else I find. Raw Scans: Composite: Cheers, Brett
  4. Hello, A colleague of mine shared some pictures of an interesting rock she found. It was found loose by a creek in the Denver area. It looks to me very much like an inner era, although it may well be something else. None of us are able to positively identify it. I'm sure someone here can confirm whether or not it is a fossil, and what it might be. The creek in question flows from the east, and my understanding is it would have to be a tertiary or quaternary fossil if it is indeed a fossil.
  5. Florissant insects.

    Nothing has been said in the Colorado section for almost a year now so lets kick it back up. A little over a week ago I posted some pictures of florissant stuff in the I.D. section. I got a lot of good help and then for the ones we couldn't figure out I tried searching for some that are similar but there's not many different photos online from florissant. I was wondering if anyone could help or if someone knew the florissant formation really well.
  6. More specific brachiopod

    I found this brachiopod imprint in some landscaping rocks in Colorado. It’s about 1.3 cm wide and I was wondering if anything else could be said about it other than brachiopod. Maybe get it to genus and possibly the period it’s from.
  7. Questions about Petrified Wood

    I found all these pieces in arapahoe county Colorado. I’m not sure where I found #2 just in Colorado. I polished a couple of them, 10-16. Is it possible to determine type of wood or approximate age?
  8. Bone piece?

    I was looking through some rocks I have when I came across this. The texture puzzles me and so I thought it could be bone I don’t know exactly where I found it just that it’s in Colorado. I don’t expect to get an ID just I want to know if it’s fossil or not. It appears to have a rounded top like an end to a bone and where it would have connected has bone like texture also on the outside there is a concave dent with the same texture.
  9. Plants and Insects From Florissant 2

    Here's a collection of all the specimens from florissant i still need an I.D. for. This large leaf i need an I.D. for Small bug about 1 centimeter across Some sort of moth i have no clue what insect this is. Could this be a dragonfly wing about 2 centimeters long but still partially covered. Could this be a wing to the right of the leaf Last one some sort of flying bug. Plant and insect experts please help I know it may be difficult to narrow it down to a species but just knowing what kind of bug it is would help. Thank you.
  10. Florissant I.Ds

    At Florissant Colorado (dated to the Eocene) my family and I found these fossils and I would like to I D them to know what I found. I didn’t have a 12 inch/30 centimeter ruler so I used my six inch to make a ruler on a piece of paper it is accurate I promise. 1. 2. 3. 4. 5. 6. 7.
  11. Is it a giant fossil???

    Hello Everyone! This rock was located in Northern Colorado in Routt County. It was found at the base of a large hill while excavating the area for a new drive. The rock is almost 2' in width and is massive. While excavating there were several areas of dirt and then veins of this white rock running through it. We are not sure if this is just a unique type of rock or if it is a fossil. There are some areas that sustained some scratches from the excavator. At the base of the hill where it was found, a creek runs along the hill. It looks like the area was carved by a much larger body of water in the past. Let me know what you think! Thank you!
  12. Small Bone from Colorado?

    I found this hopefully fossil laying on the ground and picked it up because it was symmetric and realized rocks aren’t normally symmetric so thought it could be bone and that’s when I came here Front view back view right view left view bottom view top view
  13. Small theropod footprint?

    I found this rock in some landscaping rocks in Arapahoe country Colorado. I know it will be tough. I hope the photos will be enough to get a confirmation that it’s a real footprint and maybe get an I.D There is also a lot of plant material across the whole thing which I hope is proof that it’s fossilized top view with light from the front to outline the detail of the footprint top view back view left view front view right view bottom view Close up of the largest plant piece. I don’t know If the 6 side photos matter with a rock like this but I want to be as accurate as possible.
  14. No clue what these are

  15. No clue what these are

    Let me know if you know what these are.
  16. White River potentially hollow (avian?) bone

    Hello, everyone, Lately this summer I’ve been doing a bit of casual fossil collecting (with explicit permission!) on some land that a very close family friend owns in Weld County, Colorado that has a lot of exposure of the White River Formation, and I’ve collected a sizable amount of material including some pretty awesome finds. Being an amateur, I need some help identifying some of the fossils I’ve collected. Since the forum has a photo upload limit per post, I’ll be making a few threads for different finds, I hope that is ok. This small bone appears to be hollow, which indicates to me it might be avian but that may or may not be the case. It does have a ridge/process on the lateral surface which may aid identification. Location (as stated above) is Weld County, CO, on the Brule Formation. Thanks!
  17. White River Teeth ID

    Hello, everyone, Lately this summer I’ve been doing a bit of casual fossil collecting (with explicit permission!) on some land that a very close family friend owns in Weld County, Colorado that has a lot of exposure of the White River Formation, and I’ve collected a sizable amount of material including some pretty awesome finds. Being an amateur, I need some help identifying some of the fossils I’ve collected. Since the forum has a photo upload limit per post, I’ll be making a few threads for different finds, I hope that is ok. The following are two teeth that I found very near to (but not attached to) a piece of jaw bone. My current hypothesis is that these two teeth are associated with the same jaw. From Weld County, CO. Though hard to tell from the pictures, tooth #1 does have a distinctive ridge at the apex of the crown, though this could just be wear. Tooth #2 appears only to be a fragment, and a small fragment at that, and so may or may not be identifiable unless it turns out they’re from the same animal and the first tooth is identified. #1: #2: Thanks!
  18. White River Small Partial Vertebra ID

    Hello, everyone, Lately this summer I’ve been doing a bit of casual fossil collecting (with explicit permission!) on some land that a very close family friend owns in Weld County, Colorado that has a lot of exposure of the White River Formation, and I’ve collected a sizable amount of material including some pretty awesome finds. Being an amateur, I need some help identifying some of the fossils I’ve collected. Since the forum has a photo upload limit per post, I’ll be making a few threads for different finds, I hope that is ok. This is a small partial vertebra, collected in Weld County, CO on the Brule Formation. The piece next to it is one of the transverse processes, which was barely attached when I collected it but finally unfortunately broke off when in my bag. Any identification appreciated. Thanks!
  19. White River Formation Small (toe?) Bones

    Hello, everyone, Lately this summer I’ve been doing a bit of casual fossil collecting (with explicit permission!) on some land that a very close family friend owns in Weld County, Colorado that has a lot of exposure of the White River Formation, and I’ve collected a sizable amount of material including some pretty awesome finds. Being an amateur, I need some help identifying some of the fossils I’ve collected. Since the forum has a photo upload limit per post, I’ll be making a few threads for different finds, I hope that is ok. These are two small bones that look very similar, from Weld County Colorado. To me they look a lot like the toe bones of ruminants like deer, but I’m wondering if anyone has any better or specific guesses. #1: #2: Thanks!
  20. Hi there, I found this specimen on a hike outside of Denver, Colorado. It was laying in the middle of the trail. It’s about 10cm long. It has grain that looks like wood or layers like mica. It’s also gold and shiny like pyrite or mica. It’s layers are wavy and it leaves a gold dust behind when handled. It’s stunning when the light hits it. Hoping to identify what it is. Thank you! Lisa
  21. I recently bought a ranch in Pueblo,Colorado. It has some big drainages going threw it, whare I can see many layers. I've already found tons of shells in almost every rock and one Snell shell. What can I expect to find if I'm lucky?
  22. Another found in So. Colorado

    After reviewing some of the identified fossils on this site, I think I may have a trace fossil..? But on the opposite side if this rock is another impression of a round “shell.” This was found in Southern Colorado. Any idea what the small shell-shape is in my second photo?
  23. Found in So. Colorado

    I’m hoping to get help identifying these fossils found over the weekend in Southern Colorado in shale-like terrain. Hard to tell from the photo, but the smaller one has the same type of pattern. Thanks!
  24. Colorado Phanerozoic Stratigraphy https://www.coloradostratigraphy.org/strat-chart/main-strat-chart https://uploads-ssl.webflow.com/5b4d0939b0652926fd03628b/5c8199695979564cce8da9f5_Colorado Stratigraphy Chart.pdf Fossils - Colorado Phanerozoic Stratigraphy https://www.coloradostratigraphy.org/strat-chart/fossils Colorado Cretaceous Stratigraphy https://www.coloradostratigraphy.org/strat-chart/cretaceous-chart https://uploads-ssl.webflow.com/5b4d0939b0652926fd03628b/5c74604fb2a27c4217bd3f77_Colorado Cretaceous Chart.pdf Colorado Cenozic Stratigraphy https://www.coloradostratigraphy.org/strat-chart/cenozoic-chart https://uploads-ssl.webflow.com/5b4d0939b0652926fd03628b/5c81993671795501757340f2_Colorado Cenozoic Chart.pdf Colorado Stratigraphy https://www.coloradostratigraphy.org Site Map https://www.coloradostratigraphy.org/site-map Yours, Paul H.
  25. Greetings from Peyton, Co

    Greetings from Peyton, Co! Semi new to the state and definitely new to fossil hunting. I look forward to learning from y’all. On a recent camping trip to Pueblo, Co I found a a few more, and way more detailed fossils. The shell is beautiful, but I’m particularly curious what animal the long bone with a single tooth may have come from. Any ideas? Many thanks!
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