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Found 15 results

  1. Unknown Gastropod

    I had to make a trip to the "big" city of Rochester, Mn today. As I drove by a new building site that exposed some Decorah Shale, I had to make a stop. The Decorah Shale is an impervious layer that keeps pollution from seeping into deeper rock layers and contaminating our ground water. Obviously, building permits are being obtained without adherence to the zoning which prevents interuption of this great geologic feature! I will drink my own water but collect fossils from these ill conceived sites. While visiting such a site, I discovered this tiny gastropod that I can not identify.
  2. Decorah Shale

    Earlier today, I posted a collection of fossils from the Decorah Shale from NE Iowa. I do have a few questionable ones that I need opinions of. 1. This seems geological but is very odd. Thoughts of what it is are welcome. 2. Bryozoan encrusted gastropod? 3. Is this bryozoan or sponge? 4. This big "glob" sits atop a slab of matrix. I am perplexed.
  3. My last Decorah Shale Trip.

    This will likely be my last trip to the Decorah Shale this season. I thought I would post some finds that were still in the matrix that they were found in. Many fossils of the Decorah are found separated from the rock they were hidden in. I just like fossils in matrix!!! With that said, the first picture is not in matrix. It shows a cephalopod with a Sowerbella brachiopod within it. Someone (I can't remember who) posted a similar item and I had remarked how many cephalopods have other fossils within the body chambers. Here is an example. I hope that person sees this. Secondly, @DMcLY posted a picture of a Strophomena hash plate this week. I think these pictures show the inside of the concave pedicle valve showing the muscle attachment and the exterior surface of it. It may help you visualize what you found. Now the rest are just for enjoyment:
  4. Decorah Shale Trilobite Cephalon???

    Couldn't help myself yesterday and returned to an outcrop of the Decorah Shale, Ordovician in NE Iowa. Found many nice specimens. (Adam, I may need to substitute some of my current finds with what is in your package) Here is something that perplexes me. I thought it was a partial trilobite cephalon/ genial spine but after looking at the species mentioned to occur in the formation, I struck out. Sooooo can anyone provide an identification? Thanks!!!!! Mike
  5. Two Decorah Shale Specimens to ID

    My last excursion to the Decorah Shale was meant to be a collection of specimens for @Tidgy's Dad, who helps me with identifications in this material. Unfortunately, the postage to Morocco has gone up exponentially (hundreds of dollars for a SMALL package) so that he will go empty handed. Here are a few things I am grappling with from that trip and hope to receive some incite from those more knowledgeable than me (so anyone!!). 1. This seems to be a cross section of a coral 3 cm in diameter. The corals frequent to the Decorah Shale are small solitary rugosa coral, having a rust color to them. Have looked for other types of coral and come up empty handed. 2. A hash plate full of crinoidal material. What are the linear objects scattered throughout the plate? Hyoliths or crinoidal? I guess while you are looking at this, any opinions on the owner to the genial spine (lower left)?
  6. A few weeks ago, just when we were inundated with the spring muddy season, I stopped at a site that features Decorah Shale with a little Platteville mixed in. If you haven't collected in the Decorah Shale, let me say it stays MUDDY even in a drought!! The site had been worked over for a finish grade. This means the site will soon be lost to vegetative overgrowth. So I proceeded to collect a 5 gallon bucket of mucky matrix to clean and examine at home, in case the weeds invade quickly. Here are some select finds from that bucket.
  7. ID on a fossil from Decorah Formation, MN

    I found this plate near in the upper decorah formation Minnesota (Ordovician period limestone). These chunks are frequently littered with trilobite bits and fragments but this lookk a little odd to me. It has a "knob" or bump structur on one side and a gradual bend on the other. Its still partially covered by coral and debris but most of it is exposed. Any ideas?
  8. Trilobite Plate Fragment from MN Decorah?

    I found this chunk of shale poking around a bluff side a while back near Lilydale Park in Minneapolis, MN. The fragment pictured is translucent and is slightly concave, it reminds me of a cheek plate but Im not sure. I'm new at this so I'm pretty clueless, I appreciate any help.
  9. SE Minnesota - Fillmore County Ordovician Decorah Shale These two fossils, along with many others, were found on a hunt I just hosted. This is a well known and prolific site of Decorah Shale which boosts a lot of trilobites. I believe this is a whole one as to me I believe I can identify a pygidium and cephalon, but the thorax doesn't have the distinctive 3 lobes OR the other two are still buried in the matrix. The plainess reminds me of Isotelus, a small one, but it seems too plain even for an Iso. The other fossil is an obvious imprint but I have never seen anything like it in my collecting here! Thoughts anyone? For scale Trilo top Trilo front with ceph Trilo front super cu, a bit blurred. :-( The "fan". Wet Thanks for taking a lot and any thoughts! :-D
  10. Crinoid cup or not???

    My last excursion into the fossiliferous rocks of SE Minnesota turned up this small plate of crinoidal material. I kept it because the one center piece looks a bit like a small crinoid cup to an uneducated eye (mine). This is TINY, about 3 mm in width. Cup?? If so, any genus/species to attach to it. Thanks for looking. @crinus Mike
  11. Epibiont????

    Was going to dispose of this brachiopod when I noticed what looked like some sort of epibiont on it. Any thoughts and possible ID??? Thanks, Mike
  12. Prasapora expert needed!!

    Whenever I visit the Decorah Shale the gumdrop bryozoans called Prasapora stand out. The vast majority have a domed top to them. But once or twice a summer, I stumble on a few that are distinctively pointy. Are these separate species or just variants of the same one? The species eludes me even if they are one in the same. HELP!! Mike Normal domed ones: Pointy one:
  13. 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
  14. Confused by Orthocone Cephalopods

    In the driftless areas of Minnesota, Iowa, and Wisconsin I find many Orthocone Cephalopods. Each one seems to have its unique way of being preserved, some as an outer shell, others with their internal anatomy showing. A few weeks ago Raggedy Man posted a cephalopod that looked to be a siphuncle to me. Bev on the otherhand thought it was a phragmocone. No experts chimed in so a conclusion was not determined. That following weekend, I did a little collecting in Iowa. The trip was highlighted with the finding of many cephalopods. As I cleaned the findings, my mind went back to Raggedy Man's post. The more I looked at these collections, the more I wanted to understand the anatomy exposed. I think my biggest frustrations are telling siphuncles from phragmocones. Are siphuncles always smooth surfaced? Should septa be seen in any unworn phragmacone? How does one differentiate phragmacone from the external surface of a cephalopod? Finally does anyone have a good site that ID's our local Ordovician cephalopods? Thanks for any input!!!!! Now enjoy my finds. By the way, since it IS football season, I HAD to use a BUCKEYE to size my cephalopods. If anyone is unfamiliar with a buckeye, it is a little bigger than an acorn. For any of you buckeyes, OH......
  15. Prasopora

    From the album Other Fossils

    This is a large and robust Prasopora sp. from the Decorah Shale Formation of Minnesota.
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