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  1. Quite regularly, questions turn up about the authenticity of Keichosaurus fossil specimens. Until now, most, if not all, were natural, but mostly just very poorly prepped. Would you like to show off "real" fakes, casts or replicas of Keichosaurus? I would like to get a feeling for them, at least from pics. If there already exists such a topic somewhere else in the forum, please put a link in this topic. Thank you very much! Franz Bernhard
  2. A few days ago I found a nice internal & external mold of a rare Arctinurus sp. This is something I've been looking for over 5 years. I was beginning to give up hope having never even found a pygidium in these rocks. Anyway, I decided it would be good to make some internal/external latex casts and molds and show progress here since I haven't seen much on this topic. I am doing this to observe any differences in the internal/external shells since with this type of preservation the skeletal shells have been dissolved during dolomitic diagenesis. The outer shells could possibly exhibit different features not observable in the internal molds ie. taphonomic or morphological, etc. From making comparisons, I don't think it is A. occidentalis as the anterior border projection is not as pronounced. A. nereus more pustulose and lacks anterior tongue. It more closely resembles A. boltoni but I don't think is reported from this area. So, I guess it is unknown...for now unless @piranha can identify it. First cleaned up with scribe and carefully removed the "tongue" from matrix and superglued in place. This appears to be very easy but actually took many hours. Also not shown is the more complicated prep of the external mold which had to be broken into three pieces and trimmed with a tile saw and then glued together. Set overnight. Aside from the Arctinurus, I also am making latex casts/molds of Dalmanites platycaudatus and a Glyptambon verrucosus cephalon. I don't have a lot of external trilobite molds as they usually break apart and lost in the field. This is also my first attempt at making internal latex molds from externals using hydrocal. I have made latex casts from internals with plaster of Paris but with mixed results as it is softer and more easily broken. For these I want high fidelity examples. Also, I am just winging it. Here, applying a very thin first layer of latex to the external Arctinurus mold. The first 4 or 5 layers need to be very thin and dry between applications. I decided to attach the cephalon /pygidium to the dalmanites with clay and aluminum foil to hold both parts together. to be continued...
  3. treebarkjerry

    Colorado Dakota sandstone cast?

    Found this in San Miguel county, western Colorado. USGS layer says it's Dakota Sandstone and Burro Canyon formation out there. This stood out because it wasn't just a flat blocky rock. I thought it looked like it came out of one of those playdoh things where you squished the stuff through and got a star shaped rope or a bunch of spaghetti. But it's all sandstone and when I cleaned it up I see it's got some kind of mineralization on it. Whatever it is it's resting on a slightly different type of sandstone that I tried to show in the 2nd photo. Limb cast sandstone wood rreplacement?
  4. Rachel26

    Possible footprint cast?

    Hi just wondering if this is a cast of a footprint. Found on beach on the Isle of wight uk Many thanks
  5. First up, I am not claiming that casts are of equal importance to the actual skeleton. I am annoyed however I come across arguments by anti-collectors that it is not feasible for museums to cast fossils in private collection. The recent rediscovery of the "Proteosaurus" casts should prove beyond any doubt that while a cast isn't on par with the original, they can still provide invaluable research data to paleontologists. https://royalsocietypublishing.org/doi/10.1098/rsos.220966 I hope that more paleontologists can consider partnering with private collectors and vice versa. I am sure the majority of private collectors would be happy to loan their fossils to museums
  6. Geojonser

    Insect fossil?

    Hello My first post, Nice to meet you all, in advance. I am an amateur geology enthusiast/fossil hunter. Purely as a hobby and for my personal enjoyment. I found this stone in a very unusual place, stuck in the tire of a piece of construction equipment in The Netherlands close to Rotterdam. Pure random chance. Not where I would normally hunt. Unfortunately, this piece of mobile equipement could be used all over the country so it is impossible to say exactly what its origins are. It looks to me, to be a piece of shale or oil shale that has spent a considerable amount of time in the sea, as it is smooth and well rounded. I noticed the shell cast right away, but after I got it home, cleaned it up and examined it under light and magnification, I noticed something very curious. What looks to be some sort of fossilized/crystallized (?) insectoid. In the photos, you will see what looks to be some sort of insect abdomen, larva or pupa (plant seed?) along with some other interesting things I noticed that I thought might help with identification. Please see the photos. I have added notes to them. It is approximately 2.5 mm long. Under direct light and magnification it appears to have a green hue and translucence. Next to the "insectoid-looking-thingy" is a curious round cast (?) form. Crinoid, perhaps? It is approximately 3 mm below (downhill) from the insectoid-looking-thingy. The stone is black with, what I believe to be, quartz inclusions and possibly (always a tough call) extremely small bits of fossil material. Thanks in advance for your input. Looking forward to future collaborations and shares. Have a nice day
  7. Hi all, I picked up a Lot of 15 fossils and one very large whale vertebrae at an auction recently. Sadly it had all been treated as junk and several fossilised teeth had been broken, one tip lost, no identification or history attributed to the items. I find it quite sad when a fossil survives for 100+ million years in nature then gets wrecked immediately in someone’s care because it doesn’t make as much money as a pair of earrings . Anyway, going off topic... so I have this group of unloved fossils - teeth, vertebrae, bone - which I will probably never be able to fully identify. Amongst them all are two claws and I can’t tell if they are real or fake. They are about 3” long, light (21 and 25g), feel brittle and not very dense (like clay though they are obviously not clay). They are not resin or plastic. The thicker claw seems to have a seam around the middle as though two halves have been glued together. What are your thoughts? How do I find out more? I’ll post the other fossils in the ID forum. Many thanks.
  8. I was lucky the last time out and found a 36" piece of a near shore sea floor. Most of it looks like this, a mixture of shells, shell fragments, and casts. Would you remove the good stuff or leave it as is?
  9. Found in the Lee Creek spoils pile. Is this some sort of coral or a cast of a burrow? The item is tubular and was hollow at one point and filled with something that looks like obsidian or flint. Or maybe it was the other way around and the "filling" was covered by the material surrounding it? Maybe something geologic and not even a fossil?
  10. Lone Hunter

    Is this a cast of something?

    This is unlike the calcite I usually collect, it looks compressed, and like it was part of something, the shape looks too unusual to be natural. Hoping someone might recognize the shape. The part of the creek it came from was Eagle Ford but downstream from Alluvial deposits.
  11. Mostly small fossils (think less than 20mm, many 2 to 3 mm). Maybe a pound or two. Brands on Amazon, other sources? The molds would be used to photograph for fine internal and external detail from casts. I am clueless when it comes to this.
  12. Rubykicks

    Petrified wood identification

    I believe this is petrified wood. I Found this and a larger piece, but the larger one is a different texture. It's more smooth with dimples and I was able to figure out identification of that one, but I'm not so sure about this one. Any information?
  13. Which do you prefer to Mold or Cast - Why? Secondary question is have you ever used a vice to break shale or sandstone? I started do this and seem to get good results.
  14. Nathan8372

    Plant Cast or Animal Fossil?

    Good Morning, I came across this interesting piece about 3' below-grade in Live Oak County, Texas. I've managed to dissolve some of the 'caliche' with 5% vinegar to clean this up a bit. There is pet wood and the occasional Columbian Mammoth molar in the same vicinity as this piece was found. It is relatively light for it's size, compared to pet wood. Looking for anyone who can offer an opinion/advice on this piece.
  15. OregonFossil

    What would you do?

    So I have found a significant "load" of mostly bivalves in a very deep water mudstone. This mudstone is very hard, when it fractures it is a lot like obsidian, extremely sharp and extremely hard. The specimen in this image is 3 x 5mm. The calcium shell has very little identifiable structures, yet the cast part seems "fair" crisp. If the shell was removed perhaps shell parts would be shown in the cast for ID. Would you remove the shell (if so how? acidic acid?). Any ideas on how to soften this mudstone, it is as hard but not as brittle as any shale I have seen. G picks don't see to do anything but an 8 pound sledge works:( Imaging done with a Panasonic G9 and Olympus 60mm macro lens using focus stacking.
  16. No images (yet, they are coming), yesterday in celebration of my Stereo Microscope (3.5 to 90x with camera port) shipping I decided to go fossil hunting. @71 I have to be careful when I go hunting (my wife it turns out is a fair weather digger) by myself. I have spent the last months working on my collections from the summer in two Keasey Formation locations (deep and shallow marine) with good manual tools and a dremel, but with sup-optimal hand optics (one is actually a very nice 8x optic but just to hard to use). So my wife said why don't you get a reasonable scope (would be my first since high school). So I ordered an AMscope and added a ring light to go with my video LED's I used for lighting. Not the best, but what I could afford and should work well with my camera capable of taking 80 MPX stills and being tethering to my PC showing the image on a 4K 50" screen. So being excited I went to the easiest of the two locations I've been "digging". Low 40's (F) and raining when I left in my Subaru Crosstrek (both of my cars are 4x4's to get me where I want go go here in Oregon) I was thinking "if I only find a couple of new things I will be happy". This location the actual out cropped is on an extremely steep hill, and I "dig" only in the talus at the bottom, what falls is where I find. As I approached the site I started to fill the anticipation. I parked at the base of the hill, and started my adventure. There are two layers at this location, one is a sandstone that is loosely consolidated (I think shallow water) and the a hard Shale (earlier deep water). First find in an unconsolidated sandstone that falls apart in my hand leaving a complete (top/bottom shells - one piece) in my hand. Big smile. Then I look a bit farther and I see the "mother-load" as the miners say. Apparently the heavy rains of the last couple of weeks have cause a large piece of shale to break off the formation and tumble the 70 or 80' down and break into about 15 rocks weighing between 5 and 30 pounds, fossils are abundant in every rock. I know the state will clear these because they are on the edge of the road and present a hazard. I move and leave 3 pieces for the next lucky person. I load what I think is about 100 pounds of large rocks in the car and then add a trash bag full of the unconsolidated sandstone, and a 10 gallon buck of small pieces that have the same matrix of shells. I now have my winter tasks all set. I've accumulated a lot of research and images from which work on the identifications this winter. If this find had not be a road hazard on this blind curve I would have left more but there was a road crew working not more than a couple of miles away and I could not risk that these precious finds would end up in the rock crusher or just dumped somewhere. I will be posting my finds here asking for ID help I am sure and with the new scope hopefully some great images. All and all a great way to start the New Year off. I've attached just a quick macro shoot of a snail. Haven't ID it yet, guess anyone? BTW its a cast and that is why some areas are Out of Focus (didn't have time to stack images).
  17. LabRatKing

    Skull cast prep- porcine

    I was able to get an exact ID on this American Museum of Natural History cast...which I promptly forgot on a Post-it on my desk at work... so posting now as this is the next attempt at museum quality display prep. will update the ID in an edit...can remember it’s a cast of the type specimen from the Sharps formation. Porcine. for this one I plan extensive reconstruction to make it better than found!
  18. Will follow up with current stage photos shortly! Here is what I started with: Unidentified Provenance Unknown Really bad mold mismatch/ thick seam
  19. LabRatKing

    Cameloid skull and ramus- NE SD ?

    Whew. Last one with identifying marks to identify. Is a museum cast. UNSM 4616 Sure, I could email the collections curator at Morril Hall, but I’m afraid to wear out my welcome. As of yet have been unable to find data on this one on my own. Figure I’ll give yinze a crack at it before I bother the museum for the twentieth time. My research shows this to be a camel of some sort. It is likely Nebraska or South Dakota in origin for the original due to the provenance of the other casts yinze have seen me dealing with the last few weeks. This is a pretty poor cast with lots of missing parts broken off from poor storage. In fact, it is so bad I’m considering doing a full on arty reconstruction as it is not suitable for display or education in its current form. Due to the pigmented plaster, it does not photograph well. Cannot find a single reference to this number online. ( doesn’t help there’s a wristwatch and a snake fossil with similar ID numbers) Any ideas? I really want to finish ID of these casts so I can focus on real fossils!
  20. Fast and dirty: Found this cast a day or two back in the stock room- someone made an attempt...so I’m going to fix it since it uses similar colors to the lion and peccary projects.
  21. dorky

    need help identifying this

    I went camping today. ok, not really camping. just picnicking at a campsite in the woods. we didn't stay over night because it is far too cold. so I found this rock with these cool indentions and want to know what it is. at first I thought it was by a tool but it's not. thanks, dorky
  22. Resist_Hoarding

    Basement recovery part 2 Reptile Replicas?

    Part 2 of my Fathers basement I have 2 crocodile skulls and one turtle. I believe they are Replicas? but the teeth on the crocodile are Fossils? once again I believe these are out of Morocco in the 70s or 80s? Thank you
  23. tjeis

    tubular trace fossils ID?

    New to geology, so excuse my paltry terminology. Description: Tubes, many branching, between 1-3cm in diameter, in places as thick as a forest root system, material very sandstone-y, surrounding material clay. from my research these seem like burrow casts of... worms? tetrapods? do burrow casts form in such abundance?
  24. Hi I found this with the rest of my fossil replicas and was wondering if it could be a Rex tooth or another type of Tyrannosaur tooth. I don’t know if I can post this here or get an ID on it since it’s a replica but I got it at the Royal Tyrell Museum in Drumheller, Canada it’s a replica of one of there specimens. And I just wanted to know what it could be since it seemed strange to me on how skinny and long it is, Thank you!!
  25. Righteous

    What is this called?

    I know it’s a internal cast of something but I can’t remember what.
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