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  1. charrisoni

    No clue on this one!

    Hey all! Sorry if the information provided isn’t sufficient, but I’m new here. I’m a wildlife biologist and I do a lot of surveying for snakes in rocky areas. A good friend of mine directed me here to help with a fossil ID, as I come across a lot of interesting fossils in the rocks I turn over and the road cuts I search. Attached is a photo of a fossil imprint in a dolomite outcrop. This would be western St Louis County. If more information is required, please don’t hesitate to ask. thanks!
  2. Doug Von Gausig

    Fossilized raindrops?

    This dolomite stone was discovered near Chasm Creek, central Arizona. It appears to have the fossilized impressions of raindrops splashing into a fine muddy surface. The stone seems to be dolomitic, as HCl causes a low fizz, unlike typical limestone's more energetic fizzing. Most of the "splashes" have the central "rebound" splash seen in my high-speed imagery of water droplets. That central rebound appears to have been broken off over time. Does my assumption that this is a somehow frozen-in-time rain shower make sense?
  3. Doug Von Gausig

    Matrix stone with tabulate coral

    The fossils in this stone are probably Thamnopora sp., a tabulate coral common in the Verde Valley of Arizona. Normally it appears in dolomite from the late Devonian (Frasnian), This specimen was picked up way outside the normal range, in an ancient riverbed, where rocks generally come from the Martin and Redwall limestone beds to the west. What's weird (to me) is that this stone matrix is impervious to HCl. No reaction at all, as if it's chalcedony, but it doesn't look or feel like chert or any other chalcedony I'm familiar with. Does anyone have an idea what this stone may be an
  4. MeargleSchmeargl

    Cambrian Shady Dolomite east of Cartersville

    So I've been reading some bulletins recently looking for a new place to hit when I came across this interesting section in bulletin 54 (https://epd.georgia.gov/document/publication/b-54-geology-and-mineral-resources-paleozoic-area-northwest-georgia-1948/download): I've heard of the Archeocyathus from the Georgia fossils website and that they're Georgia's oldest fossils coming in at ~516 MYO. What I didn't hear about, however, was this: Trilobites? More importantly, Wanneria??? For reference, here's the bug in question:
  5. Huntonia

    Chunky Dolomite

    I tried to get some dolomite ready for prepping today, this is first time I've used the dolomite since I got more serious about the quality of my medium, and first time trying pure dolomite. The dolomite I have is raw dolocron from the pottery supply house, I couldn't find any pre-sifted on their website. I used a mortar and pestle, baked the dolomite and sifted through a 120 mesh. Very little powder went through the mesh and what did is still clumping and sticking to surfaces. I don't think it will run through the paasche like this. Here's the mesh after a spoonful of
  6. BeforeDinosaurs

    Getting Started In Southeast Wisconsin

    I'm excited to get into fossil collecting, but before I spend money on gear, I'd like to be able to make an informed decision. The fossils I'd be collecting are from the Silurian age Racine Dolomite. I know that Estwing tools are generally considered the best, but other than that, I am completely unsure as to which hammers and chisels would be most appropriate for breaking these apparently very hard rocks, or even how to go about using them. I know a spot on a friend's property (by the Milwaukee River) where there are a bunch of Silurian rocks piled up, so I don't think access will be a huge p
  7. These tiny fossils I suspect of being Receptaculites, but I'm not at all sure. The patch is about 12x12mm, about the size of a dime. It's on Martin formation dolomite from the Devonian, Verde Valley, Arizona. Other fossils on the same rock include Rugose and Tabulate corals and unidentified Brachiopods. Note the lichens growing in and on the sample. Any ideas?
  8. Doug Von Gausig

    Tabulate coral ID - Syringopora or Aulopora?

    The attached photo is a group of Thamnopora corals found in the Devonian Martin formation - dolomites of central Arizona's Verde Valley. There is also a group of tabulate corals that I suspect are Syringopora sp.. but some collection notes by others don't show this genus, but they do show Aulopora sp. as found in the same location. See the small worm-like cluster near the center of the image. Can any of you confirm which genus is in the image?
  9. deutscheben

    Parking lot trilobite find

    There have been some great reports in the last week of folks hunting the Silurian and I wanted to add a report for my own serendipitous mini-trip from the last weekend. A few months ago, I had noticed a large pile of buff-colored stone dumped next to a retention pond in front of a local retail district. I thought they looked very similar to the Silurian dolomite I have seen and collected from elsewhere in Illinois, so I have been meaning to take a closer look. Last weekend I finally had some errands to run at Target with some free time on my hands, so I wandered over to the pile t
  10. deutscheben

    Illinois Silurian Trilobite Cephalon

    This partial cephalon was found in rip rap near a quarry that exposes the Silurian Racine Dolomite in Kankakee County, Illinois. I have seen similar examples listed on the auction site, but without IDs. Looking at older publications leads me to think it is Dalmanites, but I'm not positive, and definitely unsure what the species designation would be. Thanks for any help!
  11. Steadly approaching 3 years of collecting from dumped dolomite piles in Milwaukee County has lead to a plethora of "Calymene celebra" molts from Silurian Dolomite of the Racine Formation. Wenlockian. Many hours have been spent with a large sledge hammer breaking out mold of Calymene and other trilobites in similar ways to the Cedarville dolomite in Ohio. The trilobites are almost always complete and are in a noted molting position shown in Weller 1907 An example from my collection and prepped Over the three years we have collected over a hundred complete individuals from the dolomite.
  12. The other day I posted trilobite pics in this ID page thread I just used a beat up drywall saw to cut the section with the trilo out of the slab, then tried to "split" the whacked at the rest of it hoping for more. The siltstone (noncalcareous dolomite maybe?) was so soft it just crumbled. I tried tapping around the edges, which just sort of mashed in, and also tried a chisel, which just took off crumbly flakes (and I wish that was as easy when I try to nap flint). I knew if I found another specimen I'd destroy it trying to get at it, but went for it anyway as a technique-lear
  13. dalmayshun

    Praire du chein group i.d.

    Once again this summer I was able to do a bit of fossil hunting on the edge of a quarry between Shawano, WI and Green Bay. I believe it is Praire du chein, but it could possible be St Peter. At any rate, these three fossils were all found in the same stone, which i believe is dolomite, from approximately 50 feet lower than the surface. (Though not this stone, I found another nearby, that was dolomite with a 2"thick layer of what I would call mudstone, easily broken off in sheets...it contained small as well as small braciapods..a really interesting stone...I had my loop with me, and so
  14. Hi all, I have been searching through posts in the forum about various types of abrasives, and I can't seem to find a comment anywhere where someone breaks down the pros/cons of the different forms of abrasive and their microns. Of course I realize everyone has their own preferences, I am just confused as to the objective benefits of what looks like the three main types of abrasives: dolomite, aluminum oxide, and just plain baking soda (besides the fact that baking soda is more delicate.) The Paasche Air Eraser comes with 240 micron aluminum oxide, but that seems to be
  15. Haravex

    Dolomite micron size

    I was just wondering if anyone knows the partical size for dolomite as need to order a new tank for the sandstorm abrasion unit. Thanks Matt
  16. Hi, I am wondering what the white globular mineral growths are on this dolomitized Dawsonoceras mold. Calcite? Thanks for any help.
  17. blackmoth

    trilobite in river?

    It is in the Changxing island of Dalian, a port city located in NE China, somewhere near Korea. The calcite/dolomites seems to have some scattered trilobites pieces. But the dolomite and clay layers stack up alternatively, which is not supposed to be marine face? BTW, the rocks are supposed to be of Early to Mid Cambrian period. I can not tell the speices of the trilobites. I do not know if they are heads or tails.
  18. Is dolomite powder as toxic as it states on the bag and should i use more than a dust mask while useing it?
  19. Recently I've been revisiting some local Silurian outcrops. I have a love/hate relationship with these outcrops as they are incredibly difficult to work with, however I secretly enjoy that aspect as well. The fossils represent the Homerian stage just before the Mulde Event, so roughly 422 - 426mya (if I'm not mistaken). For whatever reason, in the Racine formation, Gravicalymene celebra are almost always complete in the molting position and other species usually found disarticulated. The trick is extracting them without destroying them. Sometimes they are found enrol
  20. I have been reading through the threads about dolomite powder as a blasting medium for cleaning trilobites. Am I correct in my understanding that to get the range consistenty around 40 microns you need to run the powder through a 325 mesh sieve? I am assuming the dolomite powder available from places like the pottery supply house is not consistently in range of 40 microns, and will need to be sifted. Is there a place to buy 40 micron dolomite than anyone can recommend. (Someplace along the London to Toronto corridor would be ideal) Thanks in advance!
  21. This post is about a well preserved Gravicalymene celebra molt I recently found in the Laurel member of the Salamonie formation of Southeastern Indiana. It is quite a peculiar specimen since it appears to have two very distinct mineral compositions. Most of the trilobite is composed of dolomite as is typical for fossils found in the Laurel. However, I initially noticed what appeared to be white calcitic pieces of the cephalon partially exposed at the anterior end of the specimen. The matrix surrounding these pieces was very easy to remove, having a fine sand like consistency. After some prep w
  22. Hello Dear, In the 14th September 2017 I found this armor plate from agnathan and found out that it belongs to Ohesaareaspis, the cephalaspid ostracoderm from Late Pridolian Ohesaaare stage, end of Silurian. I found it it Varena town, South Lithuania, it was in dolomite erratic. Its length is 1,3 cm and it has very interesting surface texture of tubercles. The genus was not identified in Lithuanian (Southern Baltic region) erratics till now, please vote if you are interested. Regards Domas
  23. Dear Guys, I found this fossil in the July 21, 2017 in Varena town, South Lithuania (it is Southern part of Baltic States). The genus of this lungfish is Ctenodus, sp-ecies are not identified. Its age is from Svete horizon to Klykoliai series (Late Famennian- Lower Tournaisian). This genus is still not found in the Lithuania and Baltic States, my find in dolomite erratic is the first dicovery in this region. The length of fossil is 6 mm. Please vote for this fossil if you are interested. Best Regards Domas
  24. squali

    Dolomite prep

    I’m wondering if anyone has experience preping stickleback fishes from a dolomite matrix. Obviously it is extremely soft and the preservation is decent but can literally be rubbed away with a breath. Will PVA stabilize dolomite or will it just melt at the introduction of any liquid? A friend gave me a piece to check out and I’d like to stabilize it. Any help appreciated. I can add pics tomorrow if needed. thanks Jeff
  25. I started working on a Mosasaur snout end, and so far it is coming well. I have been running into one issue though with starting to use a sandblaster, and that is that I can't figure out how to clean the extra dolomite off the piece when I am done. I have tried blowing it off with an air compressor, which gets most of it, and using water, which has caused some problems. The water seems to get into cracks and destabilize the matrix, leading to breakage. Any ideas? On this one it dissolved some elmer's glue that was used in a repair, and on some trilobites it broke the matrix.
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