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Fossil found in Sierra County New Mexico in a wash located in the Monticello Canyon. Geological determination for this area is documented as Cretaceous - Mississippian. We have found horn coral and some type of sea sediment rock in the wash. Would like to have an opinion on this fossil embedded in rock.
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Hello all! I have finally finished sorting close to 300 pounds of anthill from north central New Mexico. I recovered (literally) close to 18,000 fossils! Most are identifiable, but there are a few that I can't put a name to. I am going to put up several for your expert analysis (not being facetious, you guys have an enormous amount of knowledge!) to see what you have to say. I will repeat this introduction for each grouping of photos, only changing the take number. Thank you all in advance! This fossil shows the internal structure that I normally see in Ptychodus. But when I flip it over, it is totally smooth. Any ideas?
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The first is a strange tooth whose crown extends far into the root. As you can see on the photos, there is a bulge at the bottom of the crown, and that the root extends up the sides of the crown quite a ways. Any ideas?
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There is a new centrosaurine ceratopsid from New Mexico described here: https://link.springer.com/article/10.1007/s12542-021-00555-w If anyone is unaware, the holotype of Menefeeceratops sealeyi was initially described by Williamson (1997), who refrained from from giving it a name because the holotype was incompletely prepared at the time of its initial description. With the description of new centrosaurines from southern Laramidia over the past decade, the exact relationships of Menefeeceratops to other centrosaurines have now been possible to decipher. Williamson, TE (1997). A new Late Cretaceous (early Campanian) vertebrate fauna from the Allison Member, Menefee Formation, San Juan Basin, New Mexico. In Lucas, SG; Estep, JW; Williamson, TE; Morgan, GS (eds.). New Mexico's Fossil Record 1. Albuquerque: New Mexico Museum of Natural History and Science Bulletin 11: 51–59.
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- centrosaurinae
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The attached paper describe six osteoderms, two vertebrae, and a partial tooth discovered in the Menefee Formation of New Mexico and representing one of the earliest occurrences of Deinosuchus on the Laramidian subcontinent. https://peerj.com/articles/11302/
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I got many bags of micromatrix to sift through over the Summer, one of them being from the Bull Canyon Formation, which is Late Triassic in age (~227-208.5 Ma). As has been said many times before, not much is known about the teeth that can be found here, unfortunately. The vast majority of fossils that I've found so far are fish scales, lots of fish scales. I've found a few teeth, serrated and non-serrated (mostly partial), a couple of tooth plates/jaw fragments, and random chunks of bone. The matrix is about medium grain size. For scale, the sorting dish I'm using has 1 cm squares. Most of the rock is a red color, and the fossils are almost entirely white. Here are couple of "in situ" shots: Jaw section (fish?): Tooth plate (also fish?): Serrated tooth fragment: Non-serrated, striated tooth fragment (amphibian?): A nearly complete serrated tooth!:
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Day two of posts. I am posting four more fossils that I need help with. The first is a fragment. It looks like the tooth broke off right before the main cusp. There are two accessory cusps, the larger one looks like it has striations. This caused me to think of Cretodus semiplicatus. However, according to Welton, this shark only has one set of accessory cusps, never two. So any ideas?
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The final tooth of today is problematic in that it is a fragment. The main cusp seems to be complete, but that is all I can offer. Any help with this one? More to come tomorrow.
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The second tooth of today, at first glance, looks pycnodontid. But in the hundreds of pycnodont teeth I have found, I have never seen this type of ornamentation. And the root (as worn as it is) is definitely not that of a pycnodont. Any ideas?
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This is the other post that I was not able to find on the Forum (I'm sorry if I am just not finding it) This seems to be an odontaspid of some kind, but it is exceedingly small. Any ideas? I will be posting four more unknowns later today
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I am posting new photos of the original item in question in addition to photos of some of the other finds. I sincerely appreciate everyone's comments and interest in this subject and above all I thank you for your time and patience. I will not cover anything from the original thread simply for lack of time so I suggest you reference "bone fragment" if needed. So the following photos are of just a few of what has turned out to be something wonderful in my opinion. The items that I and a trusted friend have uncovered are either not much at all or something very awesome. Again this is only a small fraction of things still being found on the surface to no more than 3 inches below the surface.
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Hello all! I have finally finished sorting close to 300 pounds of anthill from north central New Mexico. I recovered (literally) close to 18,000 fossils! Most are identifiable, but there are a few that I can't put a name to. I am going to put up several for your expert analysis (not being facetious, you guys have an enormous amount of knowledge!) to see what you have to say. I will repeat this introduction for each grouping of photos, only changing the take number. Thank you all in advance! This fossil is somewhat like a cretolamnid, but is very small. An extreme cretolamnid lateral tooth?
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As mentioned in my opal post this was also in the mystery box and was looking for any ideas. About the size of a deck of cards.
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Found this roadside while taking dogs for a walk. Its a long dirt road going north to south and ends at Hidden Valley Ranch, Luna County New Mexico. It is likely nothing but I found it worthy of asking.
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I was super excited when I found this piece earlier this week while mending fences and would appreciate any help..
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I found this a few years back near (but not in) Guadalupe Mts National Park. Is it a sponge, coral, algae, or something else? Piece is about 6 inches across. Thank you for your help.
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I have a little over 60 acres here in Southern New Mexico so I find some great specimens almost daily, unfortunately my knowledge in this field is minimal at best so I am grateful to read your comments and very eager to learn.
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Very new to the forum so my apologies if I am incorrectly posting or otherwise. I am an avid meteorite hunter and have been for over 30 years so I do run into many fossils and artifacts so with that said I have many to show and many questions to ask . I'll start with this one and would appreciate your input on what this might be.
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Is anyone familiar with the Paleozoic formations on Bear Mountain, just northwest of Silver City, New Mexico? I have collected there a couple of times but am unsure as to which formation I was sampling. My first guess is that it is the Andrecito Member of the Lake Valley Limestone (Mississippian (Early Osage) but I know that there are also fossils found in the underlying Devonian Percha Shale, especially east of Silver City. There are a variety of brachiopods, bryozoans, rugose corals, and some crinoid bits. The photos show one of the larger brachiopods. Do you recognize it? Thanks.
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This carnivore coprolite was found in the Bull Canyon Formation (Upper Triassic - Norian), Quay County, New Mexico. It contains numerous fine, boney inclusions (white). There also appears to be a small jaw inclusion that has a shape similar to amphibians. Originally, I couldn't figure out why there would be so many finely crushed bones. It is not something I usually see. When bone fragments are present, they are usually larger. That said, fibrous osteoderms are also found in the same area. I have included an image of a fairly large one. They are made up of fine, boney fibers that have a configuration similar to woven fiberglass. So here is what I am wondering: 1. Could the fine bone fragments be the indigested remains of these boney osteoderms? Perhaps from juveniles? I do have some small fragments (somewhere), so I could dissolve them to see how they fall apart. 2. Does anyone know what type of animal had these fibrous plates? All I could find is information on osteoderms from phytosaurs and aetosaurs. Neither of those appear to be fibrous. I have found osteoderm fragments of that type in coprolites, but they look nothing like this. I know some of the Triassic amphibian-like tetrapods had osteoderms, but I haven't been able to find information on these. Since the shape of the jaw in the coprolite has a similar shape to those animals, I'm thinking they may have had this type of osteoderm. Of course more than one type of prey may have been on the menu. Osteoderm Magnified Osteoderm I've been away from the forum for a while, so I'm hoping there are new folks out there that specialize in Triassic critters. As always, thanks for looking! @Carl @MarcoSr
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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.
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Alternative combination: Leptolepis schoewei. Taxonomy taken from NMNH Catalog Number USNM V 17903. DIAGNOSIS after Schaeffer & Patterson (1984): "Middle Jurassic teleostean fishes of leptolepid grade, but differing from similar fishes in having only chordacentra until late in growth. The chordacentra receive perichordal additions only in the midcaudal region, and only in the largest specimens. About 50 vertebrae, 30 abdominal. Dorsal fin in the middle of the back with about 16 rays; anal originates beneath posterior edge of dorsal, with about 14 rays; pelvics beneath dorsal origin, with about 12 rays. No bone-enclosed rostral commissure or rostral pitline; supraorbital sensory canal not meeting infraorbital, and with three medial and two lateral branches above the rear of the orbit…." Identified by oilshale according to Schaeffer and Patterson, 1984 on the basis of the leptolepid maxilla and praemaxilla, fins and fin position, weak scaling, and absent or weak chordacentra. Line drawings from Schaeffer and Paterson 1984: Reference: Dunkle, D. H. (1942): A new fossil fish of the family Leptolepidae. Cleveland Mus. Nat. Hist., Sci. Publ., vol. 8, pp. 61-64. Schaeffer, B. and Patterson, C. (1984): Jurassic fishes from the western United States, with comments on Jurassic fish distribution. American Museum Novitates 2796: 1-86. Schultze, Hans-Peter and Encisco, Gonzalo (1983): MIDDLE JURASSIC AGE OF THE FISH-BEARING HORIZON IN THE CANYON CITY EMBAYMENT, COLORADO. Journal of Paleontology, V. 57, No. 5, p. 1053-1060. Lucas, Spencer G. and Heckert, Andrew B. (2015): NEW MEXICO’S RECORD OF JURASSIC FOSSIL VERTEBRATES[DTB1] . In Vertebrate Paleontology in New Mexico: Bulletin 68, p. 97-104.
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There are fossils in the background gray sedimentary, but so much better preserved in brown! Why? Almost like this pile of creatures is on display, a 7 inch blob just laying on top of gray stone. I'm more interested in how these were preserved than what they are.
