Jump to content

Search the Community

Showing results for tags 'dolomite'.

  • Search By Tags

    Type tags separated by commas.
    Tags should be keywords or key phrases. e.g. carcharodon, pliocene, cypresshead formation, florida.
  • Search By Author

Content Type


  • Fossil Discussion
    • General Fossil Discussion
    • Fossil Hunting Trips
    • Fossil ID
    • Is It Real? How to Recognize Fossil Fabrications
    • Partners in Paleontology - Member Contributions to Science
    • Questions & Answers
    • Fossil of the Month
    • Member Collections
    • A Trip to the Museum
    • Paleo Re-creations
    • Collecting Gear
    • Fossil Preparation
    • Member Fossil Trades Bulletin Board
    • Member-to-Member Fossil Sales
    • Fossil News
  • Gallery


  • Anson's Blog
  • Mudding Around
  • Nicholas' Blog
  • dinosaur50's Blog
  • Traviscounty's Blog
  • Seldom's Blog
  • tracer's tidbits
  • Sacredsin's Blog
  • fossilfacetheprospector's Blog
  • jax world
  • echinoman's Blog
  • Ammonoidea
  • Traviscounty's Blog
  • brsr0131's Blog
  • brsr0131's Blog
  • Adventures with a Paddle
  • Caveat emptor
  • -------
  • Fig Rocks' Blog
  • placoderms
  • mosasaurs
  • ozzyrules244's Blog
  • Sir Knightia's Blog
  • Terry Dactyll's Blog
  • shakinchevy2008's Blog
  • MaHa's Blog
  • Stratio's Blog
  • Phoenixflood's Blog
  • Brett Breakin' Rocks' Blog
  • Seattleguy's Blog
  • jkfoam's Blog
  • Erwan's Blog
  • Erwan's Blog
  • Lindsey's Blog
  • marksfossils' Blog
  • ibanda89's Blog
  • Liberty's Blog
  • Liberty's Blog
  • Back of Beyond
  • St. Johns River Shark Teeth/Florida
  • Ameenah's Blog
  • gordon's Blog
  • West4me's Blog
  • West4me's Blog
  • Pennsylvania Perspectives
  • michigantim's Blog
  • michigantim's Blog
  • lauraharp's Blog
  • lauraharp's Blog
  • micropterus101's Blog
  • micropterus101's Blog
  • GPeach129's Blog
  • nicciann's Blog
  • Olenellus' Blog
  • nicciann's Blog
  • maybe a nest fossil?
  • Deep-Thinker's Blog
  • Deep-Thinker's Blog
  • bear-dog's Blog
  • javidal's Blog
  • Digging America
  • John Sun's Blog
  • John Sun's Blog
  • Ravsiden's Blog
  • Jurassic park
  • The Hunt for Fossils
  • The Fury's Grand Blog
  • julie's ??
  • Hunt'n 'odonts!
  • falcondob's Blog
  • Monkeyfuss' Blog
  • cyndy's Blog
  • pattyf's Blog
  • pattyf's Blog
  • chrisf's Blog
  • chrisf's Blog
  • nola's Blog
  • mercyrcfans88's Blog
  • Emily's PRI Adventure
  • trilobite guy's Blog
  • xenacanthus' Blog
  • barnes' Blog
  • myfossiltrips.blogspot.com
  • HeritageFossils' Blog
  • Fossilefinder's Blog
  • Fossilefinder's Blog
  • Emily's MotE Adventure
  • farfarawy's Blog
  • Microfossil Mania!
  • blogs_blog_99
  • A Novice Geologist
  • Southern Comfort
  • Eli's Blog
  • andreas' Blog
  • Recent Collecting Trips
  • retired blog
  • Stocksdale's Blog
  • andreas' Blog test
  • fossilman7's Blog
  • Books I have enjoyed
  • Piranha Blog
  • xonenine's blog
  • xonenine's Blog
  • Fossil collecting and SAFETY
  • Detrius
  • pangeaman's Blog
  • pangeaman's Blog
  • pangeaman's Blog
  • Jocky's Blog
  • Jocky's Blog
  • Kehbe's Kwips
  • RomanK's Blog
  • Prehistoric Planet Trilogy
  • mikeymig's Blog
  • Western NY Explorer's Blog
  • Regg Cato's Blog
  • VisionXray23's Blog
  • Carcharodontosaurus' Blog
  • What is the largest dragonfly fossil? What are the top contenders?
  • Hihimanu Hale
  • Test Blog
  • jsnrice's blog
  • Lise MacFadden's Poetry Blog
  • BluffCountryFossils Adventure Blog
  • meadow's Blog
  • Makeing The Unlikley Happen
  • KansasFossilHunter's Blog
  • DarrenElliot's Blog
  • jesus' Blog
  • A Mesozoic Mosaic
  • Dinosaur comic
  • Zookeeperfossils
  • Cameronballislife31's Blog
  • My Blog
  • TomKoss' Blog
  • A guide to calcanea and astragali
  • Group Blog Test
  • Paleo Rantings of a Blockhead
  • Dead Dino is Art
  • The Amber Blog
  • TyrannosaurusRex's Facts
  • PaleoWilliam's Blog
  • The Paleo-Tourist
  • The Community Post
  • Lyndon D Agate Johnson's Blog
  • BRobinson7's Blog
  • Eastern NC Trip Reports
  • Toofuntahh's Blog
  • Pterodactyl's Blog
  • A Beginner's Foray into Fossiling
  • Micropaleontology blog
  • Pondering on Dinosaurs
  • Fossil Preparation Blog
  • On Dinosaurs and Media
  • cheney416's fossil story
  • jpc
  • Red-Headed Red-Neck Rock-Hound w/ My Trusty HellHound Cerberus
  • Red Headed
  • Paleo-Profiles
  • Walt's Blog
  • Between A Rock And A Hard Place
  • Rudist digging at "Point 25", St. Bartholomä, Styria, Austria (Campanian, Gosau-group)
  • Prognathodon saturator 101
  • Trip Reports
  • Glendive Montana dinosaur bone Hell’s Creek
  • Ladonia Texas Fossil Park


  • Annelids
  • Arthropods
    • Crustaceans
    • Insects
    • Trilobites
    • Other Arthropods
  • Brachiopods
  • Cnidarians (Corals, Jellyfish, Conulariids )
    • Corals
    • Jellyfish, Conulariids, etc.
  • Echinoderms
    • Crinoids & Blastoids
    • Echinoids
    • Other Echinoderms
    • Starfish and Brittlestars
  • Forams
  • Graptolites
  • Molluscs
    • Bivalves
    • Cephalopods (Ammonites, Belemnites, Nautiloids)
    • Gastropods
    • Other Molluscs
  • Sponges
  • Bryozoans
  • Other Invertebrates
  • Ichnofossils
  • Plants
  • Chordata
    • Amphibians & Reptiles
    • Birds
    • Dinosaurs
    • Fishes
    • Mammals
    • Sharks & Rays
    • Other Chordates
  • *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)

Find results in...

Find results that contain...

Date Created

  • Start


Last Updated

  • Start


Filter by number of...

  1. Newbie here. Discovered this fossil on the shoreline of Bruce Peninsula, Ontario Canada, Lake Huron side in Dolomite rock. Is it Orthocone Ammonoid or Orthocone Nautiloid or something else? I believe these are common finds in the area but this one is much bigger than others I have seen and the creatures shell appears partially fossilized rather than just an impression. Any insight appreciated including possible age. Thank you.
  2. While fossil hunting last year, I collected some shale from between two lenses of Silurian dolomite in Ohio. I have since cooked it down and searched for microfossils, and all I've found (aside from contaminating insect parts) are what appear to me like marbled fragments of bone and what might be . . . denticles? I'm really not sure and would appreciate any suggestions; please see the attached photos. All fossils are about at most 2 or 3 mm in width. Thanks!
  3. What better way to celebrate the end of the year than with a little fossil hunting? And the hunt ended with some spectacular stromatolites; read on! ----- When I got an itch to hit the field last month, I reached out to a quarry in Perrysburg, Ohio to collect fossil and mineralogical samples for donation to academic institutions. The quarry was kind enough to grant me permission to collect on their property for several hours in late December, so when the time came, I suited up and headed out with a trusty assistant. The quarry exposed outcrops of the Lockport and G
  4. hadrosauridae

    dolomite media prepping question

    OK, I have a question for the learned members of the forum. I finally got some dolomite powder for my blaster (absolutely love it so far!!) and put in a few hours of using it last night, and it raised this question: Do I need to bake my dolomite to dry it before using (or storing)? I have read that dolomite is hydroscopic, and I have noticed this brand new powder has a strong tendency to "bridge" in my media canister. I also had several instances where it seems like a clump of it would exploded on the fossil being prepped. I'm not getting blocked, its not plugging the line or th
  5. HKBEE

    Lander, WY marine fossil?

    Found by my husband 7/12 near Lander, Wyoming. Sorry for the lack of scale. the whole chunk is about 15cm long. Any leads appreciated! 15 cm long.
  6. aek

    Silurian fragment

    Any ideas on this fragment from the Silurian Bisher Fm. Kentucky? Measures 1 cm.
  7. 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!
  8. 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?
  9. 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
  10. 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
  11. 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
  12. 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?
  13. 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?
  14. 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
  15. 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!
  16. 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.
  17. 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
  18. 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
  19. 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
  20. 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
  21. Hi, I am wondering what the white globular mineral growths are on this dolomitized Dawsonoceras mold. Calcite? Thanks for any help.
  22. 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.
  23. Is dolomite powder as toxic as it states on the bag and should i use more than a dust mask while useing it?
  24. 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
  25. 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!
  • Create New...