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Found 12 results

  1. Last month I was able to make a brief trip to hunt the Ordovician rocks of the Upper Mississippi Valley. The stratigraphy up here was very confusing to me at first since a lot of the units are very similar looking. To that end, I am endeavoring to include more site pictures in my trip reports of this area, in the hope that it will assist others when collecting this area. My first stop was in SE Wisconsin. Unfortunately the right of way was much narrower in person than on Google Earth so I did not feel comfortable collecting here. But it was a great site to observe the three lowest
  2. Tetradium

    100_9380

    From the album: Minnesota Ordovician Decorah Cephalopods

    A large Endoceras proteiforme. From Decorah shale. Only a little section of the shell remains on the lower half. The segmented part are septum and the smooth part are siphuncle.
  3. tombk

    Decorah partial trilobite?

    I found this in Decorah Iowa at a road cut. I don’t know whether it is from the Decorah Formation, though. I used a thin, stiff wire to scrape away some of the matrix. I wonder whether it is the lower part of a trilobite. Thanks for any thoughts!
  4. Tetradium

    100_9177

    From the album: Trilobites of Minnesota Decorah/Platteville/Galena Formation

    Ceraurid hypostome. Platteville Formation (SW corner specimen) and rest are Decorah Formation. For a long time I thought it was little rolled up trilobites, that's how much the hypostome look like. Tiny .5 cm for Decorah ones and .6 cm for platteville ones. Decorah ones seem to be uncommon to common and very easily overlooked because of its tiny size. Heck I wonder how many had I overlooked over 5 years.
  5. We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes
  6. A friend uncovered this oddball today in the Late Ordovician (Sandbian) of eastern Missouri, in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group. He's been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but this one I'm at a loss on. Too wobbly for an orthoconic cephalopod, too much space between calcite elements for a crinoid column. Given the size, is machaeridian a possibility? What other ideas should we be considering?
  7. TheGoblinKing

    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.
  8. Does anyone know of deposits other than the LeGrand crinoids where each species is preserved in a different characteristic color, all on the same slab? We have this kind of thing in the brachiopods and trilobites of the Decorah Formation (Late Ordovician) here in Missouri, which is what got me thinking about it. But I've never seen a report summarizing other cases of this phenomenon, and as I think about it I'm not sure I can name any others. Can you? Brachiopod photo info: A= Zygospira B= Rafinesquina C= Doleroides 1 = Isotelus, rusty brown 2 = ?Achatella, light gray
  9. Hello, bug lovers! I found some pretty cool trilobites this last Sunday at my favorite road cut in Wisconsin. Since I'm a bit of a noob with bugs I'd appreicate some help on IDs and a confirmation on the formation. I think this is the Platteville formation. But it could be Decorah.....? @piranha Sorry for the pics in advance. Lol Found as is. After a bit of prep. Gabriceraurus mifflinensis? Ceraurinella scofieldi (possibly more thorax)? Continued......
  10. Micah

    Lepidodendron or coral?

    While I was looking at a recent post here on the forum trying to help someone identify a Lepidodendron tree root I realized I had found something similar to Lepidodendron bark that I had just assumed was a piece of coral since I found it near other aquatic fossils. I found is somewhere near Decorah, Iowa (I don't remember exactly where). It's a bit worn, but does anyone know what it is?
  11. I have a few hash slabs I use for educational purposes, and I'd done a couple of events recently, so I was taking a look at one of the slabs and noticed this small fossil. It is approximately 6.5 long by 3 mm across. The shape is roughly triangular, and the cross section may be triangular (it could be a V-shaped "sheath"); unless it is incomplete or collapsed, it cannot be four-sided. It is not perfectly symmetric, but slightly curved and lopsided (although the skew of the keel could be a preservational artifact). Both exposed surfaces have linear markings, so that it looks vaguely segmented,
  12. Clanjones

    Decorah Shale

    Are there still any good sites for the Decorah Shale in the St. Paul area? Shadow Falls has exposures, but they are not productive (only small bryozoan fragments, small brachiopods, and the occasional small trilobite fragment). We used to find large burrow casts and recepticulites at Lilydale Park, but it is closed permanently. Are there any other sites that yield the same kinds of things?
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