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Found 24 results

  1. Hey there, got a pickle for y’all. This one was given to me and it was said it was from Dakota sandstone in central Utah. Not sure if this means the Naturita Formation, very low Mancos Shale, or very high part of the Morrison formation. I was thinking it was a vertebra but with how deep the curve is I am wondering if it is a toe or extremity bone or some sort? added some closeups of it under a microscope, varied from 600x to 2000x magnification
  2. I took a geology excursion a couple of weeks ago, and had the chance to explore the I-40 road cut through the Gallup Hogback east of Gallup, New Mexico. Rather to my surprise, I came across a nice oyster horizon within the Mancos Shale. I realize the preservation is sketchy enough to make precise identification difficult. I'm wondering if these might be "baby" Inoceramus. I'll try to post some better pictures of samples I brought home later. And, since I consider myself lucky if I even get the right phylum -- I suppose another possibility is ostracods.
  3. fossilsonwheels

    Strange Cretaceous Orectolobiformes?

    I found this tooth several years ago while searching micro matrix from Colorado, which I am now certain is Mancos Shale. Never mind. Mystery solved. Lesson learned=I need to wear my glasses when trying to ID teeth from pictures lol It’s a Catshark or something similar.
  4. Friday was a second trip out the the Windmill sites with a quad and a geologic map overlay. I scouted out a site further north that was across the arroyo. I am a geologist by training but not so much about fossils or minerals, mostly tracking layers and mapping.
  5. Some of you may have seen my ammonite donation. If not and you are curious it is linked here: It is an important player in this trip. Anyway I thought I might describe my first trip to this locality and why you might realize it is a little more rare than the normal finds there. Some of this is part of a poster for the now cancelled Rocky Mountain Section of the Geological Society of America so if I ever do get to put my poster online I will post a link here so you guys can look at it too. For now here is a trip report.
  6. Hello all, I thought this would be a fairly easy identification, given the distinct deep indentations in the ridge of this ammonite fragment. I looked in Fossil Index of NA, Invertebrate Fossils by Moore et al, a Collignoniceras survey and the Atlas of Cretaceous Life, online. This fragment comes from Mancos Shale near Moab, Utah. Help appreciated. And if you can suggest sources for this era and region I’d appreciate it. Thanks. Tom
  7. Hello all I wonder if anyone can help me with this invert. It is from the area between Moab and I-70, in a formation identified as Mancos Shale by a former BLM paleontologist. Roadside Geology of Utah places this area as Cretaceous. The shell is 3cm long and and about 2.75cm side. The distinguishing feature is a grove running down the center on the longer dimension. There is sign of horizontal banding. I have looked in the Atlas of Cretaceous Life online, Index Fossils of No. Amer., Invertebrate Fossils by Moore et al and “Mid-Cretaceous molliscan record from west-central New Mexic
  8. Hello all, Before I post a ‘what is this’ query I’d like to see if I can ID seversl fimds on my own. I have a number of shells from the Mancos Shale near Moab. In terms of references I have Index Fossils of North America, and Invertebrate Fossils by Moore et al. The Index Fossils might have gotten me close but still, no cigar. Other sources I have are particular to ammonites. Can any of you suggest references I might find online that cover non-ammonite Mancos Shale fossils? Thanks, Tom
  9. My girlfriend, Valerie and I planned a two week trip to New Mexico and Colorado to visit friends, see scenery, and attend the Peach Festival in Palisades. Of course fossil collecting would be a part of it. I spent a full day with PFOOLEY outside Albuquerque in the Puerco Valley hunting ammonites in the Carlile Member of the Upper Cretaceous Mancos Shale.
  10. ober


    Hello all. Time for me to go to school again, and ask for help identifying this fragment of what I take to be an ammonite. I found it in Mancos Shale outside of Moab. This segment is about 10cm long and about 4.5cm wide. It is in a thin slab with no sign of the shell continuing on the underside of this piece of stone. The two photos show all that can be seen and the third gives a sense of the thickness of the rock. I was unsure of what this was until PFOOLEY called my attention to Kennedy et al. A Revision of the Turonian Members of the Ammonite subfamily Collignonceratinae. This helped me see
  11. ober

    ammonite genus ID?

    Hello all, I have what I believe to be a segment of an ammonite. I think this is in the Acanthoceratidae family. I can see the suture patterns very clearly. This piece is 15 mm long and was found in Mancos Shale near Moab. In ID-i got it I find the Cretaceous Atlas of Ancient Life particularly helpful. So first, am I on the correct track so far? If so, then I wonder how I can I go to the genus level of identification. I am looking at the robustness of the ridge pattern and see it is common with Acanthoceras, but there are other possibilities as well. Does an incomplete sample like this allow y
  12. ober

    cross section of ammonite?

    Hello all, here is another fossil for which I’d appreciate some ID help. It is about the size of a postage stamp. It looks to be a cross section of an animal. There were extensive ammonite shell fragments in the area and I wonder if this is a cross section of one? It was found in Mancos shale north of Moab, but before reaching I 70. I darkened the fossil so it was more visible. Don’t know that I like that effect. Thanks for your help.
  13. ober

    mancos shale id help please

    This impression and partial exoskeleton is slightly larger than a postage stamp. It is from a Mancos shale deposit outside of Moab, between the city and Rt 70. I’m unsure of the words to use, but it looks like there was a central back carpace with a skirt around it. ID help much appreciated. Thank you.

    Marine Trace fossil

    I have seen this type of trace many times before...each time I wonder. Do you have any ideas? The knife is 3" in length...thank you for your thoughts.
  15. DeepTimeIsotopes

    Mancos Shale Ammonite: Help Wanted!

    I've been looking for an ID for this big boy. So far I've found this site (http://www.ammonoid.com/Prionocyclus.htm) but I'm not sure what I'm looking for to differentiate between them. Could anybody more knowledgeable help me out?
  16. Hi Everyone, First Fossil ID post. This item was found in the Rio Puerco area around Cabezon Peak. Supposedly, this specific area is an outcrop of the upper Cretaceous, likely a transgressive sandstone deposit of the Mulatto Tongue of Mancos Shale. The specific location is termed Shark Tooth Ridge by many locals. I was initially told to be Bryozoan but have no further information. Any help with identification would be appreciated. There are two pieces that fit together as seen in pic Rio Puerco-0000. The main objects look to me (Extreme novice) like some bone or
  17. Calcitized phragmocone.
  18. Calcitized phragmocone.
  19. Calcified phragmocone.
  20. Calcified Phragmocone.
  21. Ludwigia

    Prionocyclus hyatti (Stanton 1894)

    From the album: Cephalopods Worldwide

    13cm. From the Turonian upper Cretacous Carlile Shale Member of the Mancos Shale Formation in New Mexico. Obtained on a trade with PFooley. Thanks, Mike!
  22. Ludwigia

    Prionocyclus hyatti (Stanton 1894)

    From the album: Cephalopods Worldwide

    8.5cm. From the Turonian upper Cretacous Semilla Sandstone Member of the Mancos Shale Formation in New Mexico. Obtained on a trade with PFooley. Thanks, Mike!
  23. Rockhounder1

    Are these teeth?

    I find these in the Mancos Shale formation in Colorado. I also find shark teeth and un-serrated teeth as well as various shells, ammonites, and trilobites. I have been unable to identify these. Any help would be greatly appreciated.
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