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Found 20 results

  1. Pierre Shale, South Dakota Help

    It is so cold in the Chicagoland area I decided to go through fossils that I have not looked at in years. I came across a little container that contained a couple items that I collected back in the early 90’s. I am 99% sure that I collected thenm from the Pierre Shale along I-90, West of Wall Drug. I know there is a small portion of an Ammonite, but I wonder about the other pieces. I believe they all came out of the same concretion.
  2. I saw reference to something called "acid prep" for oil shale fish.... never heard of it, and would like to know more: what kind of "acid", and how is it used. ALSO-- I mainly want info on the prep of fish found in cretaceous Pierre shale-- the black, crumbly stuff. Anyone? Thanks!
  3. I cant do any fossil hunting anymore, but i can still prep. My youngest son is a real fossil hunter go gitter. He finds lots of stuff like his father used to do. He worked on this and then called me and asked if I would help out. He has a ME9100 that I gave him and he knows that I have a Junior Jack. A Junior Jack will remove 10 times the rock the 9100 will do. wish I had a before photo, but afraid not. Took me about 7 hours to get this far. Lots and lots of rock to remove. The appature on this Placenticeras is not correct but it was shaped in order to remove rock to expose this male Hoploscaphites crassus? My son May have a before picture. If so, I will post it and then you will understand why ive done what ive done. This rock measures 12 inches. Kinda heavy too! RB
  4. News About North Dakota's Plesiosaurs

    Jeff J. Person & Becky Barnes, 2018, New Plesiosaur Exhibit at Heritage Center State Museum. Department of Mineral Resources Geo News. 45(2) pp. 1-4. https://www.dmr.nd.gov/ndgs/documents/newsletter/2018Summer/New_Plesiosaur_Exhibit_at_Heritage_Center_State_Museum.pdf https://www.dmr.nd.gov/ndgs/newsletter/2018Summer.asp Clint A. Boyd, 2018, A Pleasing Discovery from North Dakota’s Ancient Seas. Department of Mineral Resources Geo News. 45(2) pp. 5-10 https://www.dmr.nd.gov/ndgs/documents/newsletter/2018Summer/A_Pleasing_Discovery_from_North_Dakotas_Ancient_Seas.pdf https://www.dmr.nd.gov/ndgs/newsletter/2018Summer.asp Yours, Paul H.
  5. Multi Ammo Rock

    I was moving some stuff around and doing a small bit of cleanup to make some room on my prep bench. Ran into a very nice little finished crab which i had forgotten about, and also ran into this multi ammo rock that ive been working on from time to time and then It got buried and forgotten. Put in about 3 hours of rock removal and its starting to look like something now. Its got a long ways to go still, but at least its finally gettin there. Where ever 'there' is. Ha!!! Anyways, I removed a heck of alot of rock from this rock after gluing it back together. Just glad I wasnt keeping track of the hours! RB
  6. Another Pierre Shale Ammonite

    Finished another one of the ammonites. This one went a lot easier than the first after having a little more practice. Seemed to have a little better separation too. This one was almost entirely with my CP scribe, and just a little clean up and rock smoothing with the Aro. Here is the before.
  7. Pierre Shale Coprolite

    Here is another coprolite. Wondering if the class of organism that defecated it can be determined. I found it in a particularly desolate (in terms of fossils) exposure of Pierre Shale (late cretaceous) in NW Nebraska. It was the only fossil I found in 2 hours of hunting. Pic to left shows close-up with fish bone inclusions. @GeschWhat
  8. New Finds From Pierre Shale

    Picked up several specimens during my exploration of what I believe to be a local outcropping of the Pierre Shale in Colorado Springs. A decently preserved Baculites for sure with nice sutures and an unknown fossil. Any help this one would be appreciated.
  9. took a recent trip to an old honey hole in the springs with reserved thoughts that it may...no longer exist. I was pleasantly surprised. When I was a kid it was essentially a mud hole and fairly exposed to the average passerby so I tried hard not to get my hopes up, plus it had been a while since I had attempted any type of fossil hunting. Following a creek bed, I pushed my way through surprisingly thick brush, thick with sticks and severely overgrown trees and bushes. Even the small game trails along the bank of the creek were difficult to discern. As I walked, my hopes began to climb and I started noticing strange wet, muddy, shale-like geology creeping up higher and higher along the river bank until a significant outcropping presented itself dead ahead of my line of sight. I immediately recognized several red-brown concretions sticking out of the wall of the muddy shale-like embankment. I pulled them loose, others unnoticed dropped to the ground and when I went to inspect I saw the dry creek bed below my feet littered with red-brown clam-like fossils. Many of the were poorly preserved in my newbie opinion but I began to hoard several on the side of the creekbed as I went back to dig out more and more. I began to notice that by following the small pockets of calcerous deposit in the muddy wall, soon to follow were more clams, some nicely preserved and covered in a brittle iridescent layer. Soon after I grew tired of pulling clams from the muddy wall, I looked up on the short, grassy cliff edge to notice a piece of some yet-to-be-identified ammonite. I picked it up and began digging carefully around it. My digging dislodged additional pieces of the ammonite and I began to speculate that it had fractured--its pieces scattered along a path nearby. I climbed up the short cliff face and walked up the grassy hill above, scanning the ground. I found a few more pieces of the same ammonite and was able to pull the largest piece from a nearby loose dirt wall. tine was running short so I carefully wrapped what I found interesting and brought it back to the car. Most of the specimens appear to be poorly preserved clams or maybe bubbles of mud? My research thus far has me suspecting the clams to be either inoceramus or ctenodonta. The ammonite, when assembled, appears to spiral up and away...difficult to describe, easier to see. I have a book that would suggest it to be turriltes but it lists the usual specimen size around 1 1/4". The partial specimen I have, when assembled is approx 4". A complete, similarly sized specimen would probably be around 6-10". Correct me here if I'm wrong and please, any advice, input, or insight would be greatly apprecoated. Thanks for reading More photos
  10. South Dakota Map

    (Posted in SD forum as well, feel free to move) I thought this would be an appropriate addition- my hope is that this map will allow forum users to plan trips to SD! Threw this thing together for you guys in some spare time at work. The map shows the extent of common fossil bearing strata in the state of South Dakota, as well as some "no-go" areas- reservations and the like. If you guys want a certain area zoomed in on let me know! FossilsSD.pdf
  11. Fossil Bearing units map

    Threw this thing together for you guys in some spare time at work. The map shows the extent of common fossil bearing strata in the state of South Dakota, as well as some "no-go" areas- reservations and the like. If you guys want a certain area zoomed in on let me know! FossilsSD.pdf
  12. Cant remember when I found this little beauty, but very little prep on this one. Im not sure but I think its a male Scaphites crassus? i left it in the rock, I like em that way. Nice and complete. RB
  13. I'm wondering if anyone has some good images that show the difference between the fox hills formation and underlying pierre shale formation? I've been reading geological report after report, but have been unable to find anything that shows a good picture of how I can tell the 2 formations apart when out in the field. I'm heading to Montana next month and have read Rockhounding Montana about 5x over, but there's not really any pictures that help differentiate the strata. I've also gone through several search engines for hours over the last 6 months too, to not much avail. I've got the geological maps of the area along with the BLM maps, but just would like to see a more real world photo. I would like to thank anyone in advance for their help.
  14. Squid Pen Dig

    Last fall after working a museum, I returned to a ranch in the Pierre Shale south of Rapid City. One of the students I'd brought with me earlier in the spring of 2016 spotted a chunk of fossil that we originally identified as wood, before we realized that it was a large squid pen! So, right before our classes started we got back together and spent a few days camping on the ranch to excavate it to donate to the museum as well as some other fossil. All kinds of things got in the way, our car broke down, we were driven out of our tents by a thunderstorm, and if it weren't for GPS we would have lost the location of the pen. The site was on a steep, soft hill of shale on the edge of a ravine with a half dozen cattle skeletons from a blizzard back in the nineties. But we got the squid out of the hill and into the museum! Almost a meter long, seems to be the middle of the rachis with a few fragments of the vane
  15. Repairing a Shell

    So i still collected this massive shell, but it is (like most of the shells I find) in pieces. I need advice on what glue to get, to best repair it. It definitely needs stabilization, and the rock is broken in to multiple parts. So far I've had no luck glueing the sandstone
  16. Haven't been out to hunt much yet, but I am planning to go out this weekend. So far I know of four general animals found on my property from the Pierre shale (baculites, gastropods, muscles, and brachiopods or bivalves) I have also found some small chunks of petrified wood laying around. but i was wondering if anyone had advice for hunting the sandstone? I am aware of layers that have well preserved fossils here, but I haven't found a very good way of exposing them.
  17. I was hoping to get a positive ID on this Echinoid fossil that I found south of Glendive, Montana. I know echinoids are rare in the formation and this one doesn't really look quite like any one I've seen. As you can see in the picture there is one protruding from the matrix and right next to it an imprint of another.
  18. Every year we travel to SD to visit my parents lake property. Their property sits on a fair amount of exposed Pierre shale with numerous limestone concretions. One of our favorite pastimes is to hunt for fossils. We usually find a plethora of baculite fossils, a few mollusks and numerous fish scales. I also found a nice 5'' section of attached fish vertebrae with some calcite crystals and possibly some gastroliths. Near our last day I decided to take stroll on the washouts. Something large caught my eye. It's shape was not consistent with the majority of the concretions on the property and looked very much like a large bone. It almost seemed to big to belong to any of the top tier predators of the period but alas I am not a professional. It stuck to the tongue more readily than the pieces of limestone higher up on the property. I will post a picture and if a higher resolution pic is needed please let me know. I fear with the violent storm season it will soon be lost as it was quite fragile. Any input is appreciated! Thank you for your help.
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