Jump to content

Search the Community

Showing results for tags 'platteville formation'.

More search options

  • 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
  • Fossil Sites
    • Africa
    • Asia
    • Australia - New Zealand
    • Canada
    • Europe
    • Middle East
    • South America
    • United States
  • Fossil Media
    • Members Websites
    • Fossils On The Web
    • Fossil Photography
    • Fossil Literature
    • Documents


  • 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!
  • 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


  • Calendar


  • 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.)

Found 20 results

  1. What is this?

    Just came back from a short trip to the driftless region of SW Wisconsin and we found a strange fossil in a road cut. I thought it was an algae at first, but I can't find any similar images. Sort of just looks like the rims of a rugose coral, but tiny? Found in Platteville formation.
  2. Endoceras?

    I found these in the McGregor member of the Platteville formation in SW Wisconsin. Endoceras?
  3. Help With Platteville Mystery Sponge

    I came across this unusual fossil on a recent collecting trip to Southwestern Wisconsin. It was attached to a hash plate containing mainly brachiopod fragments. It appears to be some type of sponge that I have never encountered before. It is roughly the size of a tennis ball with an opening at the top. There is also a smaller round opening on one side that might have been from predation. Any thoughts on what this might be?
  4. Sorry this report is late, but I wanted to wait until prep was complete as I always show unprepped finds lol. Back in May, Laura and I made an impromptu trip to Grant County Wisconsin for some trilobite action. We had spent nearly five hours hunting with only partials and some hash plates uncovered. I decided to sit in the middle of the site and take a break and let Laura search. Being bored, I started to pick up pieces of rock and brush off the dirt and broken pieces of matrix. To my utter shock, I brushed off some dirt and saw a cephalon emerge, with what looked like thoracic segments. I finished brushing off the dirt and was in shock. My first complete Ceraurus mifflinensis (Demott1987). I was not prepared at all and my wife said I sounded like a five year old opening every Christmas present I've ever wanted. Well here she is, Gabi in all her beauty. It was truely amazing to be the first human to see such a magnificent creature. Prep was completed by David Comfort July 1st. Thank you @piranha for connecting me with the world renowned prep master. Now prepped
  5. Dolichoharpes reticulata

    Last summer I had the opportunity to explore SW Wisconsin for a short afternoon. I posted my finds back then including this picture: This trilobite was IDed as an upside down Dolichoharpes reticulata by our Fossil Forum trilobite expert. He suggested that I have it professionally prepped due to its rarity. Being a conservative man to begin with, and having never had any of my finds professionally prepped, I was a bit concerned about the fees for this. But I found the right man for the job and he even gave me a great break on the prepping. The results to me were absolutely stunning!!! WELL WORTH the investment in proper cleaning. So here is the finished product:
  6. The Great Minnesota Brachiopod Caper of 1892

    The Great Minnesota Brachiopod Caper of 1892 Equatorial Minnesota, Wednesday, August 31, 2016 http://equatorialminnesota.blogspot.com/2016/08/great-minnesota-brachiopod-caper.html http://equatorialminnesota.blogspot.com/2016_08_01_archive.html A couple of papers: Weiss, M. P. 1997. Falsifying priority of species names: a fraud of 1892. Earth Sciences History 16:21–32. http://earthscienceshistory.org/doi/abs/10.17704/eshi.16.1.8174541832360711 Tweet, J., 2014, Smashed rodents, false preprints, and the BBC: the paleontology of Mississippi National River and Recreation Area, Minnesota. Proceedings of the 10th Conference on Fossil Resources, Rapid City, SD May 2014. Dakoterra. Vol. 6:107–118. http://www.academia.edu/7074803/Smashed_rodents_false_preprints_and_the_BBC_the_paleontology_of_Mississippi_National_River_and_Recreation_Area_Minnesota https://independent.academia.edu/JustinTweet http://www.academia.edu/Documents/in/National_Park_Service_paleontology Merry Christmas Paul
  7. Image of Reophax foram

    Ive been looking over some Platteville plates for a trade with a member, but I am having issues with finding access to some images or papers. The image or paper i'm looking for is on a middle ordovician foram, Reophax blackriveranus n. sp. thats found in the Platteville formation- Mifflin member. Papers on other forams found in this formation would also be appreciated. If anyone is able to assist, I would be grateful. Thanks! Best regards, Paul
  8. Impromptu hunt

    I was given a treat yesterday as my wife woke me up around 6am telling me go hunt as the weather was about to drop out and end the season. I arrived to my spots around 10am as I scouted several new sites along the way. I was finding the typical cephalopod fragments and brachiopod hash plates. As I started to head back to the TARDIS I noticed a small area that had been recently exposed from a rock slide, so I figured I'd better take a look. I'm glad I did. After moving some smaller rocks I noticed a familiar shape that stuck out like a sore thumb and had to walk away and come back just to make sure I was seeing what was there. And here it is. This definitely made the trip. My first complete Wisconsin ordovician crinoid! Unidentified crinoid Mifflin mbr, Platteville formation Middle ordovician Grant County, Wisconsin
  9. SW Wisconsin Hunt 9-11-2016

    My wife and I took a trip to Grant County here in Wisconsin on 9-11 as a tribute to the anniversary of the day that affected us all. We left around 6:30am-ish and arrived at our destination a little past 8am. It had been raining the past several days so our chances were good that slides had exposed new rock and washed away dirt from old. Upon inspection, the site looked fantastic, but the insects were out in full force. I began by just a quick walk around scouting and picking up pieces here and there; a few brachiopod plates and corals. Throughout the day we found many partials, but these were of specimens we did not currently have in our collection. I had intended to visit a few sites I had been to before. The site we were at was our first time there and the finds just kept coming so we stayed there the length of our hunt. Here are some pictures of the site and our trilobite finds. These were all found at one site in the span of 6 hours. I have tried to identify them the best I could so if I made an error feel free to correct me. Id rather have the correct name on the label than not. Mffln mbr-Platteville Formation Middle ordovician SW-Wisconsin Measurements are in centimeters Hermiarges aff. H.paulianus (Clark-1894)-Cephalon(On Right) Sceptaspis lincolnensis (Branson-1909)Pygidium(On left) Thaleops sp. With cephalopod and brachiopod association Ceraurinella templetoni n. sp. Amphilichas sp. Bumastoides milleri (Billings-1859) continued on next page...
  10. Silicified cephalopod?

    I found this a while back and just thought it was a silicified cephalopod segment as they are reported within the literature. Any thoughts or ideas? Platteville Formation-Mifflin Middle Ordovician SE Wisconsin
  11. I've been reading some posts lately about Trilobite hunting in Wisconsin. And Calebs posts and amazing finds kept popping up. The reason for my thread is to find out Caleb's old stomping grounds. All of his pictures and posts say SW Wisconsin. I know he liked to hunt the Platteville formation. Can anyone please help me to find some nice Trilo spots around here? I've never found a Trilo yet, .....i know right?! And if you don't want to post it in here for the World to see, please PM me. I'm looking for road cuts, outcroppings, maybe pits, etc. I also can't just drive out there (3hrs away) and drive around looking for road cuts. Now that i have kids, a house and other responsibilities it's really hard to get away. So this needs to be cut-and-dry, and planned. That is why i am calling on you for help. Any and all help is very much appreciated. Thanks, Charlie
  12. What's This?

    Third fossil, not sure what it is. I included 3 different pictures of same fossil
  13. On Sunday, Oct. 27 I decided to hit a site in the Platteville formation in Southwest Wisconsin. I arrived at around 9:30am and the weather had just broadcasts that it was a balmy 32°F/0°C. While being a bit chilly, I came prepared with a coat and gloves which I was very thankful for. My wife was having a baby shower and with a 2hr drive I knew I should be back to help load/unload her haul at 2:00. This left me with only about 2.5hrs of collecting time and limited me to one site. My main goal was trilobites, but I also know someone who is working on the cephalopods of the formation so I kept a keen eye out for those as well. I only found one potential trilobite, but if it turns out to be complete it will be my first of this species which is quite exciting for me. Here come the photos, only one on this post and then the rest in the next two posts... This is my "hopefully" complete trilobite. Calyptaulax plattevillensis
  14. Holy Prasopora

    It's been a slow year collecting and a slow year on finds. I have only gotten out a small handful of times, so when I get the chance to collect I take it! I took a day off work Friday, Sept. 6th and headed down to Southwest Wisconsin to hunt some Mifflin. I normally don't collect during the week but this was a special occasion. Not only was I going to get to collect fossils, but I was going to be collecting with a couple of well respected fossil gurus. I didn't ask permission to drop their names so all I will say is that I often look to their publications for IDs and other references. Collecting conditions weren't the greatest(very dirty rocks) but we found a variety of typical fossils including trilobite parts, cephalopods, brachiopods and gastropods. The find of the day in my opinion was a Thaleops ovata picked up by one of the gurus, however I'm sure the other guru would disagree with my opinion... I only brought home 3 pieces. An undescribed Thaleops sp. cephalon and a very large Prasopora, I believe the species is Prasopora grandis. These large bryozoans are not terribly rare, but this one was on the larger side of the spectrum and had a very nice round shape. Most I see look like bulbous masses and I generally leave them behind. Though the collecting wasn't ideal, the experience was fantastic! Thaleops sp. "B" (DeMott, 1963) Prasopora grandis? Bottom: Top: and with a scale:
  15. Here's an odd thing that I can't figure out. It is from the Mifflin Member of the Platteville Formation (Ordovician). Found in Northern Illinois. Don't know if it the "starfish looking thing" is attached to a larger something or if the whole thing is one creature.
  16. I haven't gotten out collecting nearly as much as I would have liked these past few months, but I finally got out today, June 1st. This was my first trip this spring to the Platteville Formation of Southeast Wisconsin and it was spectacular! We got to the first spot which was a new pit for us at around 7:45am. Luckily the owners were Amish so they were already outside working and gave us permission to collect their pit. They had recently worked the pit and put the rock they took out onto a driveway to a new barn so we looked at that too. On the driveway I picked up a little beat up rolled Bumastoides milleri. I didn't photograph it because it's a bit ugly. In the pit I found a Thaleops ovata, Sceptaspis lincolnensis, and what would have been double Gabriceraurus sp., but I couldn't find the piece that broke off for the life of me. Thaleops ovata Sceptaspis lincolnensis Gabriceraurus mifflinensis The next site was one we had collected a few times. It was here that the already fantastic day exploded into one of the best collecting outings I've had in a very long time. The list includes: 2 complete and 3 possibly complete Gabriceraurus sp. 1 complete and 1 possibly complete Isotelus simplex and 1 nice sized prone Bumastoides milleri Photos on next post. Our last stop was to collect a slab of crinoids I found last year. I brought my camera along to document the task but apparently I forgot to bring batteries... Here is the post regarding that find: Link
  17. I see these every once in a while, but I can't seem to locate any information on them. The shape is fairly consistent involving a tapering "cone" with a bulbous end. I'm hoping with such a distinct shape, someone with knowledge of Byrozoa may be able to assist me with a possible genus or family. Middle Ordovician, Blackriverian (similar in age to the Bromide Formation of Oklahoma) Platteville Formation, Mifflin member Southwest Wisconsin All pictured measure around 3cm These are 3 different specimens on the same hash slab: Thanks, Caleb
  18. Due to accidently leaving a pile of fossils at a quarry last weekend, my father and I made the trip again down to Southwest Wisconsin to collect the Ordovician Platteville Formation. It was forcasted to be much warmer than last time, but cloudy all day with a chance of rain. Luckily this was wrong and it was an absolutely beautiful day to be collecting, sunny and the temp up to 70. We decided to go to one of our new spots that has both the Mifflin and Grand Detour members of the Platteville Formation. We were looking primarily for a new species of Thaleops that seems to only come out of the Grand Detour member. We didn't have any luck with that, but what I did find was a very big shock and I must say I let out a hoot/cheer when I saw it. It was a slab of 6 rare crinoids that I have never collected myself. I think my father may have one or two, but these are much larger than anything he's found, and did I mention there were 6 of them!!? Cremacrinus arctus Crinoid Pocket knife is 89.6mm/3.52" long There's the cluster of 4 and then two more toward the lower right. They are mostly covered yet with matrix. Here's a picture of me standing next to my prize of the day. Even from theis distance you can make the crinoids out... They're in front of my gut. We continued our hunt in the large pile of Mifflin member, which lies directly below the Grand Detour member. Unfortunately I didn't find any complete trilobites, but I did find a nice example of a "once complete" Isotelus simplex with the hypostome exposed in place. The prize out of the Mifflin was a tiny Amphilichas sp. type 2 pygidium. Type 2 is the most rare of the Amphilichas out of the Mifflin. In the many years we have been collecting, my father has only found 3 specimens, and this was my first. Amphilichas sp. type 2, right next to the Hypodicranotus sp. hypostome. Isotelus simplex showing hypostome in place. Our final stop was one of our classic collecting holes. I came away with a complete enrolled Isotelus simplex that made a fantastic close to a wonderful day. Pic coming soon.
  19. After a day working around the house, my lady and I decided to hit the rocks on Sunday, Sept 16th. We ventured down to Southeast Wisconsin once again to pick around the Platteville Formation. Our goal, as usual, was the wonderful and diverse trilobite. While the weather was perfect the trilobites stayed hidden. We came close quite a few times, which is a bit frustrating, but went home empty handed in terms of complete bugs. In the list of "What if" and "If only" finds were: Gabriceraurus sp, Ceraurinella scofieldi, Encrinuroides rarus, Isotelus simplex, and Bumastoides milleri. The only one which was never complete was the Bumastoides which was a headless molt. All the rest showed evidence of being complete prior to being destroyed by excavation/time. Gabriceraurus sp., you can see the tips of the thoracic segments trailing behind where it's broken. Ceraurinella scofieldi, yup those black dots behind the beat up cephalon are more thoracic segment tips. Encrinuroides rarus, parts of the cephalon are outlined on the chipped area. Bumastoides milleri, this is just a molt so it was never complete. On the plust side, we did find some nice parts: Amphilichas sp. We are always looking for Lichid parts so this was a nice treat. I also picked up part of a pygidium and a thoracic segment. Bufoceraurus(Ceraurus) herrmanni. It's just a free-cheak, but this is one cool and very rare bug. And it is only about an inch away from the Amphilichas cephalon. Basiliella barrandi cephalon. I'm interested to see how much of it is there and how well it will prep out.
  20. With temperatures hitting the 60's in Wisconsin, that can only mean one thing... The hunt is officially on! My Father and I took advantage of the unusually warm weather yesterday to head down to Southwest Wisconsin and collect the Ordovician Platteville and Decorah Formations. While we spent 5hrs collecting, we only visited two sites, but what a couple sites they were! Our first stop was in the Platteville formation(Mid-Ordovician). While I didn't find any complete trilobites, I did find some nice parts and a couple of Clathrospira gastropods worth collecting. I also found a rare undescribed Thaleops cephalon that is refered to as Thaleops(Illaenus) sp. ind. (Cephalon B in the paper "Platteville and Decorah Trilobites From Illinois and Wisconsin" (DeMott, 1963). Now here are some photos of that stop, non trilobites first: Cephalopod with negative Clathrospira gastropod in situ Above Clathrospira in my hand Second Clathrospira Lingula brachiopod with nice "growth" lines