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  2. Miocene Era Fossils #3

    Very cool.
  3. New Mazon Creek Collection

    That Esconites is stunning. Super detail. And I rather like the scallops too.
  4. Some recent Zandmotor finds

    Here we have my biggest and best Euspira catena to date. It's still incomplete, but these are surprisingly hard to find complete as a fossil, especially at this size, so I'm quite happy with this one anyways. This is the species (along with others in its Naticidae family) responsible for those perfect holes you see in shells quite often (like the Dosinia above). They have some kind of very strong foot that allows them to drill a small hole in the shell of the prey, kill the animal inside, and suck the poor thing out of the shell and eat it. Here we have an incomplete specimen of the Pliocene Turritella incrassata with a Naticidae hole in it (probably not from Euspira catena but rather from Natica crassa, its Pliocene contemporary). Reworked specimens are not incredibly rare on the Zandmotor, but always fun to find! Talking about reworked Turritellidae, here's a small piece of what seems to be a Turritella solanderi. This species is from the Eocene, so it's definitely cool to find it in such 'young' sediments as the Eemian!
  5. Some recent Zandmotor finds

    So, for the finds, before we start, as a quick reminder (or for those who don't see my Zandmotor posts often): - The shells are from the Eem Formation, in the Eemian stage of the late Pleistocene (130'000 to 115'000 years ago), unless stated otherwise - The fish material is also most likely also Eemian - The mammal stuff is usually from the last Ice Age (~ 40'000 years old) Firstly, a pretty fun find, a Dosinia exoleta with 2 different traces of other lifeforms! The hole on the umbo is from a predatory gastropod (such as Euspira catena), and is probably its cause of death; and the carving on the bottom is a worm boring! I've found both of those types of traces on shells quite regularly before, but never on the same shell, and never on this uncommon species! And here we have an Ostrea edulis with a very clear sign of bioimmuration --> this oyster grew next to another shell and had to adapt its shape to it!
  6. Please help with age of dolomite boulder

    I wouldn't like to even hazard a guess at the genera, though clearly we have productids and a spiriferid. But I thought the rocks at this location were Upper Devonian which would fit the assemblage.
  7. New Mazon Creek Collection

    Thanks, @Ruger9a! I am generally very hesitant to do anything to the fossils I find, and I think in this case there is no guarantee it will improve anything. So I agree with you! Thanks, @flipper559! I'm sure you will find one some day, but it would help if we were allowed to be collecting right now! Chris
  8. Some recent Zandmotor finds

    I love taking pictures of sunsets, and they're always nicer on the beach, so here you guys go
  9. Some recent Zandmotor finds

    Hey everyone! Hope everyone's doing alright during this stressful situation! I haven't been too active on TFF (or with fossils in general) the past few months (mostly due to school work), but with the whole virus situation I suddenly have some more free time. The Netherlands aren't currently under strict quarantine, but schools are closed, and we're firmly recommended to stay at home and forbidden to go out in groups of more than 3. But, luckily fossil hunting is still possible, so after a long winter hiatus I finally went back to the Zandmotor (last time was when I found that mammoth tooth in October!), not once, but twice (Tuesday 17th from 11 to 6, and Sunday 22nd from 2 to 4 about). Nothing very eventful happened during either of the trips, so I'm not gonna make a whole trip report, but just show you some nice location pictures and some of the most interesting or rarer finds. What I will however mention is that the beach has changed a lot since the last time I was there, especially when considering where certain dunes, elevated parts or shell banks were located. In fact, the change between Tuesday and Sunday was impressive too. Crazy what wind and erosion are capable of!
  10. rock consolidation?

    Hello everybody! I have a fossil in a matrix and I want to keep and not to clean free. Does anybody know what to spray on a limestone matrix to consolidate it? Thanks!
  11. Petrified wood burl??

    I did polish it, so that's why its shinny. Here is another close-up
  12. Something aquatic

    It looks way too irregular (in my mind) to be coral which tends to be much more geometrically patterned. The coral skeleton produced by a coral polyp is called a corallite and is in the shape of a cup called a calyx surrounded by a wall called a theca. Within the calyx are usually several blades (septa) radiating out from the center and many corallites have a central "protruding core" called a columella ("small column"). Unless this is very highly eroded I'm not seeing signs of it being coral. @caldigger requested a close-up of the broken end and I too am curious to see this piece in cross-section as it would give a good idea to its structure that cannot be seen face on. Corals grow by laying down microscopic amounts of calcium carbonate daily and slowly build their platforms upward leaving linear tracks behind them that are very obvious in cross-section. Cheers. -Ken
  13. Snyder TX - Bi-valve

    Thank you everyone. This was a great opportunity for me to learn and I appreciate your patience.
  14. JOP New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 Matthew C. Herne, Jay P. Nair,Alistair R. Evans ; Alan M. Tait Journal of Paleontology (2019) 93 (3): 543–584. NB:5,7 MB NB extra: this links to the page,but,hey...
  15. Snyder TX - Bi-valve

    After looking at Quadrula specimens after @ClearLake and @JohnJ mentioned that genus, that definitely does seem to fit pretty well. I'm also afraid that the shell is probably recent (geologically speaking). I had never heard of this genus before though, and that hinge is nuts! Very cool, thanks for indirectly teaching me something new guys However, to answer @Spoons's suggestion of Macoma, I can see why you said that as the overall shape is quite similar, but the hinge is clearly inconsistent. For reference, here are some Macoma balthica specimens (that I collected on the Zandmotor, Netherlands; these are from the Eem Formation, Eemian, late Pleistocene ~120'000 years old) where their hinge is clearly visible: The top-right one has a very well-preserved hinge, and if you compare it to the hinge of the OP specimen, you can see that they're very different. This one has a very thin hinge with two small teeth, while the specimen in OP has a really 'fat' hinge, that includes a 'spoon' with 4 teeth, a tooth on either side of the spoon, and a long lateral tooth running down its right side. The hinge area is always a really important factor when identifying different bivalves from each other, as it is usually quite distinctive. Hinge set aside, there are 2 other differences between the two genera: the little bumps on the Quadrula never appear on Macoma (except maybe if it has some kind of pathology, but I've never seen it), and the nacre of the shell: Macoma are never nacreous. While this may seem tedious, all of these differences are actually more important than you think, because as a consequence, the two species are more distantly related than we humans are to dolphins (different Orders) according to the Linnean classification. Anyways, I hope that this explanation will help you in future bivalve identifications
  16. Cretaceous echinoid from Dalby, denmark

    Do you know which formation it came from then? Thanks for he info sorry it was sold to me as cretaceous
  17. CP or Dnsons ARO

    You might also find that a splitter ($10) after the water trap would be useful to which you would plug in your scribe and an air blower ($10) on a 6 to 12 foot hose ($10-$15). I use two 5 way splitters ($8) but they also come in 2 and 3 splits. Get any hoses you need with the correct Quick connect fittings on it. Having perfect seals at all fitting points is your goal (in reality it is almost impossible to achieve) You will need teflon tape to put on the threads at each point you connect that you install fittings (test for leaks with soap and water). You will also need a can of sewing machine oil or 3 in 1 oil. to lubricate your scribe. Get one that is clear and colorless, if it looks like oil it will stain your matrix. You need to put 1 to 3 drops of oil in the line to the scribe (after the water trap) each week or so depending on how much you are using it. If you are not using in a blast box of some kind you need N95 masks to protect your lungs (the scribe will take of dust as well as chips. Without a box you will get matrix chips everywhere in the room you are prepping in. A shop vac with a drywall dust bag will really help with clean up and can provide the negative pressure for when eventually you will have a blast box. You will eventual get one Lights You can never have too many. There are LED units (little heat thrown off and uses less electricity) for home work shops which are very good for this purpose. The more lumens the better. The two I use are 3000 lumens each. Magnification of some type. On the high end this can be a stereo zoom scope on the low end it can be a magnifier on a stand or a 2x to 3x headband type. I never prep anything except under magnification. A homemade sandbag is great for positioning the matrix you are working on so you dont have to use a hand to hold it. If you do not have a blast box you can use a shopvac to mount a hose above the item you are prepping to help keep the dust under control and out of your lungs.
  18. Today
  19. We've got time (and lots of popcorn ) and will enjoy seeing the progress over time. Take lots of photos so we can see how it progresses. Those that spot this topic a year from now will be able to "binge" the preparation process and see it start to finish like a weird stop-action movie. Cheers. -Ken
  20. Squalicorax advent calendar

    Upper Santonian again today. I am not quite sure which species the big one on the right is. My guess is S. kaupi, but it also does look similar to the S. lindstromi of yesterday. Squalicorax curvatus (left) Squalicorax kaupi (middle) Squalicorax kaupi? (right) Unknown Formation Upper Santonian Or (or Orr) River (also called Tykbutak/Tyk-Butak, not sure if this is the same location) See you guys tomorrow, Sander
  21. Petrified wood burl??

    Interesting - and wrong - statement. Especially if it reminds you of obsidian (which is an igneous rock) or pitchstone which is discussed to be devitrificated obsidian.... See here for example: I don´t understand, sorry! Obsidian is an igneous rock, of course. I think, my statement was confusing and not clear, and sorry for my poor English. Or did I miss something else? Please explain it to me! Many thanks! Franz Bernhard
  22. Looking For A Copy

    PM sent.
  23. Did I find a Devonian fish scale?

    Could be one but it seems that some of it is missing .
  24. Trilobite IDs

    @aek, We were correct!!!! Thanks so much, @piranha. Your insight into trilobites is always impressive! Mike
  25. My Trilobite Drawings

    Aw, shucks, thanks all. Now that 741/800 final papers have been read, graded, and given feedback, I'm near the end of the semester which means... more time to doodle! Some challenges for this year will include seeking the best way to photograph pencil drawings, a better way of removing/blending pencil strokes, a more practical way of getting even more crisp detail (particularly on pustules). I'll continue working to the size of the paper. It does take longer to fill it, but it allows for more detail. I consider myself about 80% to where I want to be, pencil skills-wise (last year at this time, I'd have said about 25%, so definitely pleased with the progress that comes of patient application). In the hopper is a Damesella, Metopolichas, Dicranopeltis. If anyone wants to see a particular bug being given the graphite treatment, let me know and I'll see if I can get it in the queue.
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