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  1. Ezio Bonsignore

    Harpactocarcinus punctatus

    I am very intrigued by this critter being currenty offered fo sale. It seems pretty obvious to me that the rock it is sitting on has nothing to do with the original matrix (and indeed, the seller's text does not mention thr world "matrix" at all). But then, if the fossil has just been glued onto an appropriately shaped rock, how was it prepped to start with? Is it possible for crabs to get fossilised into such a soft matrix, that is it then possible to "free" the entire fossil completely intact, with all its legs, sort of Michelangelo's style (*)? And in any case, what technology and tools could produce such a result? (*) Michelangelo maintained that the subjects for his sculptures were already present inside their marmor blocks even before he started working. on them. All he had to do, was to remove the superfluous material.
  2. Jimmy From Holland

    Preparation ideas please

    Dear everyone, I would like to hear your ideas on preparing a fish fossil from Turso, Scotland (Devonian). I am unsure of the best approach. The fossil was embedded between two layers of hard rock. The impression on one side is not entirely clear; the other side is not entirely complete (90% is there). Additionally, fish fillet has fallen out, and I have many loose pieces such as the fins, which are very thin and have matrix (grains) attached. I have been contemplating soaking the small loose pieces in acid (5%) and then rejoining them. For the larger pieces, I plan to reattach them and clean them using an air scribe and sandblaster (2.5 mohs). Another idea is to place the pieces in their original positions and create a replica on the opposite side using epoxy or cement, although this doesn't seem aesthetically pleasing to me. The tools at my disposal include: - Magnifying glass - Air scribe - Engraving pen Dremel - Dremel - Sandblaster - Sulfuric acid 100% - Cleaning vinegar I appreciate your input and suggestions. Kind regards,
  3. rocket

    crab prep

    seen some minutes ago in the www great job! Video | Facebook
  4. I have a nice piece of limestone shale with some gomphoceras fossils on it. It was apparently on the surface and there are portions with unsightly white deposits that are presumably due to abrasion. I have read that some soak a specimen in 5% acetic acid overnight; however, I am concerned about damaging the nearby fossils. I have tried to use an artist's paint brush with white vinegar containing 5% acetic acid and even with scrubbing with a toothbrush, the white abraded portions remain. Should I try soaking the entire specimen over night? Any suggestions/recommendations would be appreciated.
  5. ecclector

    oviraptor egg prep?

    Hello fossil friends I will be acquiring a clutch described as Elongatoolithidae that came from a collection out of China in the 80s. Short of sending the piece out or acquiring a $1000+ air scribe setup, what can be done as far as getting rid of some of the calcite on top of the eggshell, or better expose the underlying details? I possess a dremel with many different attachments and access to the hardware store for more supplies. I've read that the matrix these are found in can be very hydrophilic so want to avoid turning it to mush. Thanks for any comments
  6. Alex S.

    My first trilobite prep

    I decided to take a break from house work and the Hadrosaur pubis I'm working on, and prep my first trilobite. It comes from the Wheeler Shale. I'm pretty sure it's an Elrathia kinglii it's missing it's cheeks and some of its head. Here's how it started : And here is how it ended: All in all I'm pretty pleased with how it turned out. I used my Dremel to get close and then my blaster to take the rest of the matrix off. The only hiccup I had was right at the edge of the rock - some of the head blew off and was gone in the blink of an eye. After I was done I was looking at it under my scope, and lo and behold, there was another trilobite I'd totally missed near the cheek! It looks like a little 3mm agnostid trilobite. Luckily I didn't blow it off during prep. I have loads more bones and trilobites to just through, and look forward to showing you guys when I'm done.
  7. crinus

    2023 Prep Jobs

    I haven't posted in quite a while, so I thought I would post pics of some of my 2023 prep jobs. I have done a lot more than these but these are the only ones I took a before pic. Zacanthoides idahoensis Cambrian Spence Shale Richmond, Utah Pseudogygites latimarginatus Ordovician Lindsay Formation Bowmanville, Ontario, Canada Ceraurus plattinensis Ordovician Bobcaygeon Fm. Brechin, Ontario, Canada Archimedes wortheni Mississippian Warsaw Fm. Fenton, Missouri Platycrinites bozemanensis Missisippian Lodgepole Fm. Bozeman, Montana Aphelecrinus okawensis Mississippian Bangor Fm. Lacon, Alabama Glyptocystites multiporus Ordovician Bobcaygeon Fm. Brechin, Ontario, Canada Eldredgeops crassituberculata Devonian Silica Shale Paulding, Ohio This is one I really wish I had a before prep pic. The specimen underneath was a complete surprise.
  8. Kane

    Kane's Bug Preps

    UPDATE: Consolidated all my loose preparation threads into one topic. Four hours so far into this big bug, and maybe another two to go. Found at Penn Dixie this past weekend, the visible area measures 6 cm. With the pygidium, it likely measured about 8+ cm. Judging by its size and pustular sculpture, this was likely a long-lived specimen prior to burial. This is how it looked fresh in the field:
  9. Does anyone know of any good resources on and/or off the forum to learn proper techniques regarding sudden field excavation? More specifically, in the event of a significant/highly fragile find, how to properly consolidate, collect, and transport it from the field, especially in limited circumstances where proper tools, glue, paper towel/tinfoil may not be available? I’ve got the documentation/field notes bit down, but I wanted guidance on the extraction part. Photos, articles, videos, books, etc. appreciated! (Note: if this is too specific or narrow of a search request, that’s ok, any even mildly relevant material is appreciated regardless)
  10. Well, after a year of searching, I finally found my first trilobite! They are relatively rare in my area (KC), so I’m pretty ecstatic. Decided to take this prep nice and slow, here’s the bug how I found it: Rock is thankfully not really sticky, was able to spend 40 min on this yesterday: As you can see in the last photo, I used my chisel tip to scribe excess material from above where the head might be. I took it down as far as I was brave enough to do so, because I’m worried that the head might be curved upward. I’m no trilobite expert, so any premature guesses on the species? Update possibly coming tonight. Have a great weekend everyone! -Jay
  11. Hello y’all! Since my last brach prep thread, I have actually prepped another brachiopod that I intended to make this thread about, but it turns out that it had been crushed prior to fossilization. I decided that it wasn’t worth writing home for, so I present to you: Project Sticky! Here it is before any prep: Now, the name is self explanatory: the matrix is so sticky, it’s pulling off a layer of shell with every rock flake!!! You can see an area where it pulled off much more than everywhere else: I decided that while this one will be a rough brach, I might as well finish it. I’m still trying to learn, so really this is partially a practice prep. Anyways, here it is after a total of 40 min prepping: Still far from done. Aaand, when I went to hammer some of the excess matrix, this got exposed: Looks like this rock will have a double brach prep. Should make it look more eye-appealing when done. Anyways, I did all this yesterday, and it took about 1 1/2 hours. Didn’t take any pics, but I did paraloid the exposed parts of the main shell. Next update may come tonight, or tomorrow morning. Hope y’all enjoyed this, have a great day!
  12. Hello y'all, I recently got my Dremel 290, and I haven't actually prepped anything with it yet, as I have just played around with it on a scrap fossil to get a feel for it. I decided to start my first actual prep, and I figured I'd bring y'all along with me as I thought it might help others just starting out by learning from my mistakes (hopefully not too many). Well, here goes. This is a small brachipod I found, and is not very impressive, so I'm not afraid of ruining it. Then again, if this turns out the way I hope, it will be a very attractive desk display piece. Found in Kansas City area, in a roadcut that has the best mineralization I've seen yet here. Some of the shells will be black, and I have found a few that have nice blues and reds. This one is mainly grey. Before leaving town this past week, I was able to get about 30 min in. Started with leveling the matrix around the fossil a bit, then started work on removing matrix from this fossil. Hurts to scribe right through these spines, maybe someday I'll learn how to air abrasion, and be able to save the spines similarly to those spectacular trilobites we've all seen. Leveling the matrix: And getting to work on the shell: Hopefully y'all enjoyed this. I will be posting here as progress is made. Won't be able to work on it until next Monday, see y'all then! Have a great weekend.
  13. Hey all, I am working on cleaning the fossil pictured and would love advice on how to remove the plaster jacket. I was instructed to jacket it with plaster and burlap, using tin foil as a barrier. I tried using scissors which barely made a dent on the plaster, then a hand saw which shook the fossil too much for my comfort, and finally I tried wetting the plaster then cutting it with a utility knife which also shook the fossil more than I liked. I know museums use cast saws, anyone have an economical recommendation? Thank you in advance!
  14. Hey all, I was thinking of getting a dremel 290 or similar engraver so that I can prepare some of the fossils I have, because at the moment I'm using nothing but needlepoints and steel bristled brushes. As you can imagine, using this is extremely slow and not very effective. I just wanted to ask if anyone had any advice on if there are better alternatives or if I need any other equipment (such as additional tips). I already have goggles to protect my eyes and a buff to protect my lungs, so that shouldn't be an issue.
  15. Like the title states, let's see your results with acid prepping! I have found not as much info on this style of prepping, so please feel free to give some details as to how it was done, i.e. time, technique, soak sessions, etc. Have a great day everyone~
  16. I was pleased to be the winning bidder on this unprepped Knightia in a rolling auction by @Meganeura this past August. Thank you, Daniel. it was quite generous of you to offer it, along with all your other fine items. I was in no hurry to complete the prep and greatly enjoyed spending an hour with it now and then, or even a quarter- hour as it sat patiently on my kitchen table. While I envy our members with air-abrasion setups, I do appreciate the quiet convenience of pecking away at the Green River matrix whenever the spirit moves me. I began work on the skull soon after I opened the auction package from Daniel and soon found a lovely coprolite has been sitting on the fish's head for the past fifty million years or so. I'm afraid I found it rather amusing, and while the poor animal might find my attitude besmirching to its honor and an added insult to its injury, I decided to leave the attachment right where I found it. Not surprisingly, I found more fossil fish dung as I progresssed, and I've left them as found as well. I did uncover a small mass of fish bones near the top of the rectangular block, sliced by the trimming saw and mostly unrecognizable by me. I'm tempted to keep digging away at the block to see what else might be hiding there, but I'll probably just leave it as it is and move on to another awaiting project. It's not one of my best prep jobs but I'm satisfied with it and appreciate it as a snapshot of a moment in time.
  17. fossil35

    Fossil fish preparation

    I got a fish fossil, which is the first I've ever done. They had lines marked and was wanting to ask if I may have missed something? There was 2 line marks below and 3 on top that would guess was for fins. But the fish seemed to stop way before any fins? There is a raised line bump near the back of the spine(back where tail fin should be), is it a second fish maybe? or did I mess up?
  18. Hi! Just got this fossil fish from a trusted source. He didn’t know much about the fossil more then that’s it’s a stichocentrus from Lebanon. I’m having a hard time finding out if this is rare on the market. I bought it because I think it’s unique and cool. It’s prepared with resin and acid transfer which i believe is mostly used in science when studying fossils. Do anybody know anything about it? best regards Emil!
  19. Alvrr.0

    Got my dremel 290

    I got my dremel and I want to prep the Ammonite in the picture. Can someone give me some advice or tip to use the tool and for that Ammonite? I will practice first with some Ammonite fragments. The matrix is kinda soft and weak.
  20. I have dremel 3000 but I dont know if is good to prepare a short size fossil like this Ammonite
  21. I found a piece of petrified wood, ammonites , some clam fossils, belemnites and other bits and bobs on the Yorkshire coast but do I need to do something to preserve them? Or do I just leave them how they are?
  22. Recently found this rock on a trip to the Keasey formation near Mist Oregon. There are several crinoid stars visible on the outside of the stone and some segmented sections visible as well. Seems like they run throughout the rock. I found this on the ground by the stream and water erosion did a bit of work on the outside. Really curious and excited about what might be inside but no idea how to start and scared to ruin it. Any advice would be very much appreciated. Thanks.
  23. Hello Everyone, I'm relatively knew to fossils and preparation. I ended up finding a large piece of petrified wood over the weekend (about 200lbs) and was curious what the best way to clean it would be. I used some chisels, a delicate touch with a hammer, and a pressure washer to remove the obvious bits of clay. What would be the best way to proceed?
  24. Hi all, to start -- I'm a beginner in this so excuse me if I ask things that may be obvious. I was thinking about ways to improve this ammonite, but I wasn't sure what would be the best way forward. Please let me know your ideas and what would you do to make it better. Thanks!
  25. Alvrr.0

    Any tips?

    I dont know how to prepare this Ammonite (I have never done this before) so I want to know what tools can be used and stuff like that :p
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