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Showing results for tags 'microfossils'.
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From the album: Post Oak Creek
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- cretoxyrhina
- cretoxyrhina mantelli
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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.-
- cretodus
- cretodus crassidens
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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!
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- macro fossil
- microfossils
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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:-
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- dimetrodon
- dimetrodon grandis
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From the album: Permian
A "lucky break" in a Labyrinthodont tooth (likely Temnospondyl amphibian) still embedded in matrix reveals the intricate labyrinth of plicidentine.-
- labyrinthodont
- labyrinthodont tooth
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From the album: Devonian
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- devonian
- devonian shark
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From the album: Devonian
Most teeth are fragmentary, with the Phoebodus-type teeth being the most common.-
- devonian
- devonian shark
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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."-
- devonian
- devonian shark
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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.-
- devonian
- devonian shark
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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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- claw
- dimetrodon
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From the album: Permian
This may be a pathology, or a tooth in development?-
- developing orthacanthus
- microfossils
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From the album: Permian
These are virtually all the microfossils I found in two small bags of medium-grain matrix from Waurika, OK. The matrix was very fossil rich. The vast majority of the fossils are Xenacanth/Orthacanth shark teeth. Fish material is next most common, then amphibian, and lastly, identifiable reptile material is very rare.- 1 comment
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- microfossils
- permian
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From the album: Permian
A serendipitous natural break in a labyrinthodont tooth nicely displays the enamel in-foldings which give this class of amphibians their name. ^https://aaronrhleblanc.wordpress.com/2019/04/23/dental-origami-the-elegant-shapes-of-folded-dentine/-
- labyrinthodont
- labyrinthodont tooth
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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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- bull canyon
- microfossils
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Billion-year-old, freshwater, multicellular microfossils reported from the Torridonian sequence of the Northwest Scotland
Oxytropidoceras posted a topic in Fossil News
One Billion-Year-Old Fossil Could Be The Oldest Multicellular Animal. David Bressan, Forbes, April 30, 2021 https://www.forbes.com/sites/davidbressan/2021/04/30/one-billion-year-old-fossil-could-be-the-oldest-multicellular-animal/ The open access paper is: Strother, P.K., Brasier, M.D., Wacey, D., Timpe, L., Saunders, M. and Wellman, C.H., 2021. A possible billion-year-old holozoan with differentiated multicellularity. Current Biology. https://www.sciencedirect.com/science/article/pii/S0960982221004243 https://www.cell.com/current-biology/pdf/S0960-9822(21)00424-3.pdf https://www.researchgate.net/publication/350888013_A_possible_billion-year-old_holozoan_with_differentiated_multicellularity https://www.researchgate.net/profile/Paul-Strother Yours, Paul H.- 1 reply
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- bicellum
- diabaig formation
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Hi, my name is Sue, no relation to sue the T-Rex at the Chicago Field Museum. I have been collecting fossils and minerals since I was 6 and am now 65! I have a fabulous collection. I came by rocks honestly, my aunt is June Culp Zeitner, the world renowned mineralogist and lapidarian. She died a few years ago. Her museum is in Hill City, SD in Peter Larson’s Museum All Things Prehistoric. She is well published and has traveled the world for specimens. I am interested in the Precambrian era, microfossils and really any kind of fossils. Hope to talk to many of you soon. I just got a new electronic microscope with a camera. I have two children and 4 grandchildren. I live on Lake Erie and find wonderful fossils before the glacial period of course. Have a great day. Sue
- 18 replies
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- lake erie
- microfossils
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Yesterday I went to get my covid vaccine 4 hours from home near some fossil localities in Missouri that I have long wanted to explore. Unfortunately, pouring rain all day thwarted my plans, but I picked up a few things of interest. Anyway, I'm curious what this is. It almost looks like Styrofoam at first glance. Are these ooids or something else?
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- microfossils
- ordovician
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Hello, everyone, these fossils were collected from the basal Cambrian in South China, all of which are organic. But I do not know what are they? Does anyone can identify them. Please see the attachments! Many thanks.
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Hello TFF, I have been interested in micropalaeontology for a bit, especially after @Shamalama sent me some wonderful micro matrix samples along with slides for micropalaeontology. The tiny organisms like ostracods, conodonts, bryozoans and crinoids are so amazing and getting to see them under the microscope is very special. However, I have been limited in my ability to collect these fossils due to a lack of these slides, I got two from Dave which were beautiful and very helpful but similar ones online cost quite a bit, especially since most were from outside the US. For a while, I put this on hold and didn't expand my micro collection because of this but a couple of days ago I saw someone selling 3d printed slides on the auction site and this inspired me to make my own. I thought it would be a nice and quick solution and I can always just make more as I needed them. I took some measurements of the glass slides I had on hand and quickly threw together a model, This first one you cannot see in the photo below because the gaps for the glass to slide into ended up being just too narrow and my slide got stuck in it so I had to melt away the plastic and break it to retrieve it. The second one I decided to alter the model and increase both the height and width of the gap by .5 mm, this ended up being way too big and the slides just fell out. This is the slide you see at the top of the photo. Next, instead of tampering with the original model I just kept all the proportions and increased the size to 100.5%, this ended up being a perfect fit and would allow the glass to slide in and out while keeping it secure when needed, this is the middle slide you see in the photo, these early prototypes were done in red because this is the plastic I had the most of. Finally to finish the model up, I added a cutout in the side to allow you to remove the glass easier and without covering it in fingerprints and started printing it in black. You can see the final version at the bottom of the photo These slides are fully customizable, I can make the hole in them any shape that I would want, currently I am thinking about making a version with multiple circular compartments. I could probably even add some writing on the space in the front or on the back of the slide. I am not sure if there are any other interesting or helpful changes I can make to the model, I am open to suggestions so please tell me if you have any. I just wanted to share this little project with everyone, maybe it will get someone inspired to make something similar or perhaps someone will just find it interesting. Also if anyone wants it, I would love to share the files to these for anyone wanting to print some yourself, they should fit the standard glass slides for microscopes. Send me a PM if you are interested.
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- 3d printing
- microfossil slide
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So I make slides of microfossils from ~ <1mm - 2mm. I use a glue that I make with food grade gum tragacanth and water as was recommended to me when I first started. However, I have always found it a bit annoying to make, get the consistency right and keep properly, especially as I haven't been able to find any definitive guides to this. I'm wondering whether any of you use gum tragacanth as well and have a ratio/recipe/advice for me? Or if anyone has had good success (long lasting, dries clear, secure, fossil safe) with any other type of glue? Thanks!
- 7 replies
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- foraminifera
- microfossils
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I did my first microfossil sifting on the sandbars of the Kaw river in Kansas (I posted the trip on the forum ). Anywho, I found this microfossil that reminds me of modern day cowrie in pattern but I'm guessing its a coral? The second I am pretty sure is coral, the third is a worn crinoid segment? and the fourth, ummm I don't have a clue- one side has three parallel ridges- thoughts? Appreciate all the help as always! Bone
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Post Oak Creek Microfossil Matrix for Trade
ThePhysicist posted a topic in Member-to-Member Fossil Trades
I'm offering for trade about half a gallon of microfossil matrix collected from Post Oak Creek, Sherman, TX. It's rich in marine fossils from the Late Cretaceous Interior Seaway (Eagle Ford Group ~ 90 Ma). I cannot guarantee what you will find. I however can comment on what you can find based on my experience with this site. Sawfish oral teeth are very common. You may also find a variety of sharks' teeth, with about 8 genera that I've found so far in similar matrix (Squalicorax, Cretoxyrhina, Cretodus, Cretolamna, Ptychodus, Scapanorhynchus, Hybodus, Cantioscyllium, ...). Reptile teeth are uncommon. You can find a few larger shark teeth in the coarser portion, but they will likely be incomplete. I also have a small sandwich bag partly full with finer matrix (basically sand) which should contain small prizes like shark denticles. Pleistocene fossils are also mixed in, so you can find mastodon enamel next to a Cretaceous shark tooth. There is no processing required; virtually all of the fossils are loose in the gravel. I will ship to the continental US only. See this album for a more comprehensive view of the kinds and quality of fossils you may find. Here's what I've found before, hunting matrix like this: * Shark teeth, vertebrae, and denticles (~ 8 genera) * sawfish oral/rostral teeth and denticles (~ 2 genera) * fish teeth and vertebrae (Enchodus, Hadrodus) * guitar fish teeth, and denticles(?) (Rhinobatos, others) * squamate reptile teeth (mosasaurs, coniasaur) * crustacean claws/bits * clams/shells * pleistocene mammal (mastodon enamel, vole, etc.) I'm looking to trade for dinosaur-bearing micromatrix (doesn't need to be processed). For example, from Hell Creek Fm., Lance Fm., Judith River Fm., or Two Medicine Fm. I'm also open to other unlisted formations. Alternatively, if you have a decent dromaeosaur tooth you're willing to part with, I'm all ears. Please PM for offers or additional information. Thanks for looking!- 1 reply
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- late cretaceous
- microfossils
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Waited awhile to post this as I was waiting for my Christmas present to organize my findings. Trip was on 11-28-2020. Took my family of 5 plus a friend of my daughters. It was cold and raining the entire time we were there but everyone had a blast. Bought some cheap ponchos, didn’t work. Discovered that once the clay got wet and sticky it made no difference in what we were wearing. The kids ended up taking their shoes off and going barefoot. It was a mess but a lot of fun. Didn’t think microfossils would interest me but they did. Will plan another trip to see what the site looks like dry. Here are some of what we found. Typical of what everyone finds but exciting nonetheless. Thanks to everyone for posting their stories and helping us out.
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- microfossils
- texas
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From the album: Aguja Formation
Dinosaurs have a distinct bone structure, with large and well-defined Haversian Systems/Osteons (which look like rings around holes where blood vessels used to be).-
- aguja formation
- dinosaur bone
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From the album: Aguja Formation
A very small ( ~ 1 mm in length) mammal/multituberculate premolar. Indeterminate species. I unfortunately broke part of the root after this picture was taken.-
- aguja formation
- cretaceous mammal
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