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  1. ThePhysicist

    Archeria

    From the album: Permian

    Holmes (1989): "The skull and axial skeleton of the Lower Permian anthracosauroid amphibian Archeria crassidisca Cope" Art by Dmitry Bogdanov
  2. So I'm working toward a new goal of local petrified wood ID. I started working toward that goal a few months back but my viewing scope just didn't have the power (or working distance I might need). The good thing is I can use this new one for searching micro fossil matrix as well. I still have my B&L for prep but it doesn't have the power or capability of my new scope either. My new scope is an AmScope SM-4TZZ-144A-18M3. If I'm allowed I'll post a link but if not you can look it up. It does 3.5X-180X comes with a 18mp camera and a .5 and 2.0 barlow. The ocular are 20X and you get a single 10X. I'm still working at getting the camera calibrated after I was "done" I realized the ocular do not affect the camera view so I have to start over. I need the FOV of the camera apparantly. It's thanks to work gift cards (a perk I enjoyed this year especially) that I was able to get this. My out of pocket was about 1/4 of the cost. Anyway here are some photos I've taken with it. Maybe ignore the scale as I'm no longer sure of it's accuracy. The photos aside from the claw (found in Sharktooth Hill sand and the wasp eye are pet wood)
  3. Hey everybody! I wanted to make a thread sharing with you some of the smaller fossils in my collection, many of which I've photographed using my digital microscope. Some of these I've found in the field at microsites or channel deposits, while others I've found at home searching through matrix. I hope you enjoy! Our journey begins in Wyoming's Lance formation: A Pectinodon tooth my dad found in 2017. A tooth that was identified by other forum members as potentially Avisaurus, also found in 2017. A tooth I initially called Paronychodon, although the small & worn denticles may suggest otherwise. Found in 2020. A tooth which was once the smallest in my collection at around 3 mm., potentially Acheroraptor but currently is indeterminate. Found in 2020. Probably my smallest crocodilian osteoderm in good shape, found in 2019. A tiny dermal denticle, potentially from Myledaphus. Found in 2020. The smallest mammal tooth in my collection, an itty bitty multituberculate I found at home working on conglomerate matrix in 2019. A nodosaur tooth (Denversaurus) found in 2020. A collection of small fish mouth plates (cf. Cyclurus) from 2020. A salamander premaxilla (cf. Scapherpeton) found in 2020. A Thescelosaurus premax tooth from 2020. A view of some of the Lance fm. anthill matrix I brought home to search, with a piece of fish mouth plate in the center
  4. Oxytropidoceras

    Pseudofossils on Mars

    Could things that look like fossils trick us thinking there was once life on Mars? If you want to believe, fake Martian fossils might convince you (but they're just rock formations). By Elizabeth Rayne, SYFY, November 30, 20221 McMahon, S. and Cosmidis, J., 2021. False biosignatures on Mars: anticipating ambiguity. Journal of the Geological Society. An Entomologist Claims That Mars Is Covered in Bug-Shaped Things, And He Has 'Proof' Yours, Paul H.
  5. Hey all! Today I bring you some teeny tiny gastropods! All Inferior Oolite Group, Cotswolds UK. Every formation. There are a few different species that I have described here: Species A: "helter-skelter". A very very loose spiral, resembling a helter skelter... Species B: very neat loose spiraled. Species C: very tight spiral, very common Species D: fascinatingly bumpy textured spiral. Reminds me of a wallpaper! Measurements in cm. Isaac
  6. ThePhysicist

    Juvenile T. rex posterior

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Carter Co., MT, USA More information Art by RJ Palmer
  7. ThePhysicist

    Mesodma P4

    From the album: Hell Creek / Lance Formations

    Mesodma sp. Hell Creek Fm., Garfield Co., MT, USA P4 (4th upper premolar) Mesodma was a genus of multituberculate mammal that lived in the same environment as many well-known dinosaurs. It must've been a hardy animal, given the genus survived the K-Pg extinction event.
  8. ThePhysicist

    Theropod tooth fragment

    From the album: Aguja Formation

    Finally, a theropod! It's just a fragment, however.
  9. almach

    Microphotography

    Taken with my new microscope camera. The first three pictures will be of crocodile teeth from the Hell Creek formation of Montana and are from the Cretaceous period. All are taken at 20x to show a lot of detail. First photo: Borealosuchus Sternbergi is 4.5 mm long. Second photo: Champosaurus sp. is 3 mm long. Third photo: Brachychampsa montana
  10. I convinced my friend in England to send me some matrix from the Oxford Clay site I have the pleasure of hunting a few years ago. I really wanted to see what I could find in the micro stuff! He packed up a "Fosters sized package of Pay Dirt" as he referred to it and I got it in the mail a couple of weeks ago. It didn't take me long to go through it because I just couldn't stop! So many beautiful tiny fossils!! Star Crinoids, Belemnites, Ammonites, all of those I expected to find. What I was surprised to find was lots of tiny crab claws, couple of shark teeth and some possible Starfish ossicles! First the Ammonites: I am over the moon with my new favorite fossil: a Kosomceras spinosum. Even has a little bit of nacre still on it! 6mm I found an even better preserved one too, but the one with the nacre is special. On my previous hunt in this spot, all I had found were the Quenstedtoceras ammonites. They are still really cool too.... 1 cm Then there is this beauty which I am not sure what it is, but it might be Distichoceras bicostatum 5mm I found so many little crab claws and legs! Really elaborate ones and very simple ones: 3mm And of course, the crinoids - 5mm Some lovey little gastropods, including a really nice pyritized one: 5mm I think it's a Dicroloma trifida Not sure what these two are - both 3mm One of my unexpected surprises...this little tooth! 3mm And I THINK these might be starfish ossicles? If so, that would be really cool. They look an awful lot like the starfish ossicles we find in the Texas Cretaceous. But they might also just be crinoid bits. 2mm And last but not least- a little worm tube. I liked the crenulated edge on the bottom 3mm
  11. ThePhysicist

    Cretodus posterior

    From the album: Post Oak Creek

    Extreme posterior from a large genus. Note the striations at the foot of the crown, and no nutrient groove.
  12. I grew up in Austin, going to Shoal Creek and Barton Creek and my local backyard creek, picking up the odd fossil or rock and stashing it away. It has only been recently (within the last 8 years) that I really got interested in Paleontology and finding out about the formations and proper fossil names etc....so it's been fun to revisit a lot of the places I went as a kid and see them in a whole new light. When the Paleontological Society of Austin used to hold meetings in person, I'd go up to Austin early and go fossil hunting in Shoal Creek - it has easy access and is a hop skip and a jump from the meeting house. And I've found a lot of great stuff there - ammonites, echinoids, etc.. But....now I have discovered the world of Microfossils! So I got myself a gallon baggie of creek matrix, not really knowing what to expect aside from the ever present Ram's Horn Oysters (Illymatogyra arietina) which are found in the millions there. And WOW.....I was astounded! Lots of great stuff from the various formations that make up Shoal Creek - Buda, Georgetown, Eagle Ford and Del Rio/Grayson. Some of the fossils I can pinpoint to specific formations, others, not so much. So here are my favorite Shoal Creek Micro Fossil Finds! First up- The Crab Claws! So many little tiny crab claws of all kind of species. These are all 3-5 mm And the Brittlestar arm segments! Ophiuria sp. I found the first one and was so excited...and then I found an even longer segment! 6mm The first segment I found (thanks to @erose for the ID) Next favorite - Floating Crinoids! Roveacrinus signatus 3mm Another one, but with more goblet shape : Roveacrinus signatus 3mm Plotocrinus spiculatus 2mm Not completely sure about the ID on this one. I think it's Drepanocrinus paroculus 3mm Some little tiny teeth. I did find ONE broken shark tooth, just the blade, but it's my first Shark Tooth from Shoal Creek! My most exciting tooth find - Ray Pseudohypolophus ellipsis 3mm A couple of unknown Fish Teeth 2mm Not sure if this is a denticle or tooth: 3mm A couple of little vertebrae: 4mm Some funky little Foraminifera: Nodosaria sp. Size 4mm 3mm An interesting chunk of what I think is Bryozoan. Size 2mm And finally, some little gastropods. 6mm I can't wait to go back and get another baggie full of matrix!
  13. IsaacTheFossilMan

    Micro/macro, how big do we go?

    So, I'm a bit conflicted. Part of me wants to call my specimen microfossils, yet another calls them macrofossils. Some definitions state the boundary as "being able to see the fossil with the naked eye", other state it as "being able to see the details of the fossil with the naked eye", and yet others state it as "being able to see the fossil with the naked eye or low-powered microscopes". On this forum the prefix "micro" is thrown - for want of a better word - around a lot, even when it disobeys official definitions (which are still incredibly ambiguous!). What do you guys think is the range typically associated with microfossils, and what do we use here? When will the world of palaeontology adopt consistent measurements and definitions across parties!? ps: yes that was a subtle dig at the inch / yard measurements at the end there!
  14. ThePhysicist

    cf. Dimetrodon grandis

    From the album: Permian

    Now how can this crumb of a tooth be attributed to Dimetrodon?? First, it's serrated. It could be shark? The enamel is not smooth (not very visible in this image, a little at the bottom), so no (additionally, the serration shape is different from those of Orthacanth sharks). That narrows it down to serrated Synapsids. It turns out that very few animals at this time and location had "true" serrations, not just enamel serrations, but bumps in the dentine beneath the enamel. The enamel on this piece happens to still be clear, allowing one to see the globular dentine underneath! From Brink and Reisz (2014), I'd posit that D. grandis is a suitable candidate. I'm also not an expert, so I welcome contrarian arguments. I highly doubt it's Therapsid, as I haven't heard of any from the Waurika locality. D. grandis:
  15. ThePhysicist

    Labyrinthodont tooth structure

    From the album: Permian

    A "lucky break" in a Labyrinthodont tooth (likely Temnospondyl amphibian) still embedded in matrix reveals the intricate labyrinth of plicidentine.
  16. ThePhysicist

    Shark teeth

    From the album: Devonian

    Most teeth are fragmentary, with the Phoebodus-type teeth being the most common.
  17. ThePhysicist

    cf. Phoebodus sp.

    From the album: Devonian

    One of the most complete teeth of this kind I've found so far (intact root, just missing two of the cusps). It's remarkably similar to Orhacanth shark teeth from the Permian, being tri-cuspid with the little "button."
  18. ThePhysicist

    Shark spine

    From the album: Devonian

    Yes, sharks used to have spines! Xenacanth sharks in the Permian and Hybodont sharks did as well. This is the only shark spine I've seen from the Devonian - if you've got one, would love to see it.
  19. ThePhysicist

    Hatchling Dimetrodon Claw?

    Hi y'all. Found this in some Permian micromatrix from Waurika, OK. There's no way I'm this lucky, but is this a very tiny Dimetrodon claw? I've tried to get access to this paper, but still waiting to see if the authors will send the text. I'm fairly confident it's at least sphenacodontid, based on pictures I've seen on the forum. It's about 3 mm in length. @dinodigger@jdp
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