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Found 32 results

  1. Ordovician taphonomy, Iowa

    maquordovicusavanitphosphjt049-web.pdf Heyo Van Iten, Michael Lichtenwalter, Juliana de Moraes Leme,Marcello Guimarães Simões * “Possible Taphonomic Bias in the Preservation of Phosphatic Macroinvertebrates in the Uppermost Maquoketa Formation (Upper Ordovician) of Northeastern Iowa (North-Central USA)” Journal of Taphonomy, vol.4, issue 4/2006 *all diacritics omitted
  2. 2018 was the year that I finally took some time to explore Ordovician aged sites in Southwestern Wisconsin and Eastern Iowa. Inspired by past forum posts (special shoutout to Caleb Scheer who was unfortunately taken from this world way to young) along with an invite from a fellow Fossil Forum member, I was able to make several trips into the fossil rich Platteville and Maquoketa formations. I was mainly focused on finding some of the amazing trilobites that these formations are known for. I also collected some nice representative examples of the various other fauna. Most of my experience collecting Ordovician fossils has been in the Cincinnatian of Indiana, Ohio and Kentucky. For those not familiar with collecting in the Cincinnatian, the vast majority of trilobites that you will find are Flexicalymene meeki along with lots of bits and pieces of Isotelus. One of the things that struck me right away in the Platteville and Maquoketa was the quantity and diversity of trilobite types that are readily found. While almost all of the trilobites will be fragments, occasionally you get lucky and find something complete. There is definitely a learning curve sorting through the various trilo-bits and learning to recognize the various species. Forum member Piranha was always willing to help out with identifications. My first trip out was in late Winter. I spent a day with forum member Fossilized collecting a few roadcuts in both Wisconsin and Iowa. The first relatively complete trilobite that I came across that day was also possibly my rarest find of the year. It is a very rare Cheirud: Acanthoparypha sp. Unfortunately the cephalon was gone but still an impressive specimen.
  3. Trilobite ID

    I have been to Graf, Iowa three times in the last 10 years and am always amazed at this site with the shear number of cephalopods exposed in the rock face. This fourth trip was made to find some material for a forum member. In doing so, I took the time to look closely at the matrix present at Graf. There were gastropods, brachiopods, bivalves ,graptolites, and even trilobites hidden in the rock. I had never noticed this on my previous trips since the cephalopods are overwhelming. I would love to go back another time soon and NOT look at the cephalopods at all, to see what I could find. I am here today to get Identification of the trilo-bits that I found at Graf. My guess is Thelecalymene mammillata. @piranha @DevonianDigger, if you still are looking for trilobits, I can send a few of these. 2018-10-009.cxf
  4. Help With Iowa Trilobite

    This past weekend, I had a chance to collect a well known roadcut outside of Clermont Iowa. The site is Ordovician in age and exposes the Clermont section of the Maquoketa Formation. one of the interesting pieces that I collected was this tiny trilobite. As you can see from the picture,There is not much to go on however the hypostome is preserved. I am hopeful the Trilobite will be complete and was wondering if anyone might know what species it is/could be. Any help is appreciated.
  5. I am hoping someone on the forum is familiar with Ordovician carpoids. i collected this specimen at a roadcut in Claremont Ohio. it is from the Maquoketa Formation. Any information on what species it might be would be greatly appreciated.
  6. Mike @minnbuckeye kindly sent me a package of orthocone nautiloids from his area recently. It's one of the taxa that are sparse in my collection so I was happy to accept the offer. I'm posting them to show what a generous guy he is and to elicit more info about them that might be missing... I don't think that big one in the lower right was labeled - Is it the same as the other large one, Elgin IA?
  7. Isotelus Species?

    @piranha, could you assist me in identifying this Isotelus to species? l
  8. Last weekend, I decided to venture out to my favorite site to find trilobites. It is a site better visited during dry weather, but I couldn't wait! I do not know which was muddier, the truck or me when I packed it up. Here is the location without the mud visable. This material is best approached by splitting larger slabs of matrix. The result is always a bunch of trilo-bits. This is a nicer hash plate found that day
  9. Hello all, first post here but have been a long time lurker. I graduated a few years back with a degree in earth science (primarily geared towards groundwater hydrology) but still consider myself a fossil amateur. I've done some fossil hunting in the past and have researched over some paperwork that I have but am curious if any of you guys have any experience finding the Maquoketa formation and other fossil bearing shales here in Missouri. I have found one small outcrop that has yielded trilobite parts and other fun things, but I'm looking to get back in the hobby and would love to hear if anyone can give me a general idea where to begin. Or if anyone wants to share their super secret spots feel free to let me know :P. Thanks all.
  10. Conularid.jpg

    From the album Fayette County Iowa

  11. ??.jpg

    From the album Fayette County Iowa

  12. I was recently looking at the hashplates I collect a year ago near Green Bay, WI from the maquoketa formation. It is upper ordovician. As I was enjoying the look through my loop, I spotted a pinhead size dark rounded section under the blue ash layer...( that layer comes from the volcanoes in the Appalachian region). I use my 10x loop, and a pin and started scratching away the hardened material, discovering little by little a cute little trilobite. As I was moving around it, I found another cephalon, sort of "bumping into it" but I haven't worked on that one too much. But since it is a cephalon only (thus far) , I am wondering if someone can ID it for me. I have attached a view of the hash plate, an out of focus view of the trilobites with a measure, and an in focus view taken after I attached my loop with rubber bands to my cell phone. Thanks for the help.
  13. Mystery fossil

    Found near Green Bay, WI. The Maquoketa Formation. Interesting fossil not sure what is it as its lil unusual
  14. Ectenaspis Sp.

    From the album Fayette County Iowa

    This is a find from earlier this summer that I just got out tonight to start work on. I assumed when I collected it that it was an Isotelus Gigas and didn't give it much of an inspection. I did tonight though. Appears to actually be an Ectenaspis Sp. A Good surprise.
  15. All I can say is that it's a sponge... I've looked through "Sponges of the Ordovician Maquoketa Formation in Minnesota and Iowa" Rigby and Bayer, 1971 and can't seem to find a match there. The Maquoketa is similar in age to some of the formations in the Cincinnati area if that helps at all. Sponge Maquoketa Formation, Elgin member Upper Ordovician, Richmondian Northeast Iowa Size: 2.1cm long 1.7cm wide across bottom.
  16. Preliminary work...(fossil report to follow if you want to skip this) About a month ago, my father and I found a site we had never been to. We discovered that Ectenaspis beckeri parts were in a specific zone at this site and decided to come back on Oct. 6th to find some more for our study collection. We also wanted to do a little mapping to figure out exactly where we were in the formation. There are two cuts about a quarter mile apart, one at the bottom(cut A) and one towards the top of the hill(cut B ). Through much research, we found out that cut B exposed the contact between the Clermont and Ft. Atkinson members of the Maquoketa formation. We also found out that when cut B was made the contact between the Elgin and Clermont members was exposed in the ditch. This gave us a baseline to figure out where in the section we were. There is a small bridge at the bottom of the hill near cut A so we contacted the Iowa Geological Survey and got the exact elevation of the bridge. We also got the elevation of the top of the Galena formation from the IGS at various points in the area recorded from core samples. The Elgin member of the Maquoketa fm. lies directly on top of the Galena formation. Since my father works at and engineering firm, he had easy access to a theodolite and leveling rod. We started at the bridge(since we knew the elevation) and worked our way up the hill to cut B. We took a number of measurements and recorded the change in elevation between the bridge and the contact between the Elgin and Clermont members. We then shot from the bridge to the end of cut A and recorded that elevation change. We then measured the height of the cut and the thickness and elevation of the zone that was producing the E. beckeri parts. Why did we do all this? Well, this information will give us the exact thickness of the Elgin member(in this area), the elevation of the E. beckeri zone, the "slope" of the Maquoketa fm.(in this area), and the potential to be able to map other possible E. beckeri sites. It will also be useful when we eventually donate our collection to a University, the more info the better. Now that our preliminary work was done we could finally start collecting! Next post... A picture of my father surveying the hill. I was behind the camera/phone holding the leveling rod.
  17. On Sunday Sept. 8th, my father and I had to make a trip to Northeast Iowa to pick up a cupboard. Since we were in the area, naturally we thought we should go fossil collecting as well. After doing a lot of research last week, we decided to do some scouting and see if we could find any new productive sites. The first site we stopped at for only a few minutes. All we were finding were stromatolites and the occasional Favosites coral. Later in the day we realized that the site was not in the Ordovician but in the Silurian. I may have to go back to collect some stromatolites to cut and see how well they polish, they were extremely abundant. We continued on and looked at our notes and topo maps(on paper even) to locate likely sites in the Maquoketa Formation. We found one site that showed the contact between the Clermont and Ft. Atkinson members of the Maquoketa and searched for a while. It seemed pretty void of trilobite material, but I did find a beat up cephalon of a Bumastoides beckeri that I didn't collect. I was surprised to find a small crinoid and despite my father's heckling I collected a section of worm tube/burrow free of matrix. Our next location turned this fun scouting trip into a fantastic outing. After spending some time looking at the shale my father shouted "We're going to be here a while!" I asked why and he told me to come and see. I walked over and he showed me a rock and I immediately recognized what it was, though I have never seen one it person. It was a cephalon of an Ectenaspis beckeri, one of the strangest looking trilobites in the Maquoketa Formation. Shortly after that I picked up another cephalon in similar condition. After 2 more hours of battling brush, grass and the occasional snake we left with 4 cephalons and a pygidium. I also picked up a sponge and an unusual curved cephalopod, but that was quickly overshadowed by the trilobite parts. After decades of collecting the Ordovician of the Upper Mississippi River Valley it's very unusual to be able to add a species to our collection that we haven't collected before. The final stop of the day was an oldie but goodie. I didn't really have high hopes of finding a complete trilobite and was primarily looking for Ceraurus parts for study. After a while crawling around, my father yet again shouted out. He found a nice laid out Calyptaulax sp.; the cephalon is slightly covered so I can't properly ID it yet. And just like the Ectenaspis cephalons, I quickly repeted that I had just found a Calyptaulax, though his was much much nicer. Mine was a little disarticulated, the head was broken in half, it was rolled and smashed flat. Kind of a sad excuse for a bug, but it was a Calyptaulax! I continued my crawl and after collecting a few more trilobite parts I noticed a laid out Cybeloides iowensis! It was broken in a few spots, but I believe I have all of the rocks so it can be glued together. It looks like it should turn out quite nice. So the day started out as a scouting mission and ended up being one of the best collecting days of the season! Maquoketa first stop finds: Brachiopod And an out of focus crinoid calyx. I'll try to get a better photo tonight Maquoketa second stop Ectenaspis berckeri cephalons and pygidium: Sponge Curved cephalopod Final site photos on next post...
  18. Crinoid Holdfast

    From the album Other Fossils

    Another holdfast from the Maquoketa formation.
  19. Crinoid Holdfast

    From the album Other Fossils

    This is a crinoid holdfast attached to a cephalopod. There are a couple more smaller ones to the upper right of the large one.