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All found around coralville lake in iowa! tried getting better photos. Any help would be appreciated! I have so many more but these are the ones im the most confused on! tried my best to crop!
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This past Sunday, I had about 2 hours to spare, and wanted to look for fossils. I obviously couldn’t go far, so I decided to see whether I might have any luck fossil hunting along the Iowa River right in Iowa City. The exposure there is from the Coralville Member of the Cedar Valley Formation, which is mostly Devonian limestone and Dolomite. The faunal diversity in this strata is not great - some solitary and colonial corals, a smattering of brachiopods and bryozoans, and a few small crinoidal columnals. I had time to check out two locations very near downtown Iowa City, and both within two miles of my house. The banks leading to the river in this area are relatively short (~10-15 feet), but can be steep and/or blocked by dense vegetation. The first location allowed access to the river via a small boat launching ramp. The river at that point is not scenic and the brief stretches of shoreline contain a surprising amount of large discarded slabs of concrete. This must have been near somebody’s favorite fishing spot, as I saw a chair perched neatly on the stones of the shore. I poked around for a bit and found quick collection of some species of the colonial coral Hexagonaria. I assembled the finds for this photo. They are not that well-preserved. I did find it interesting that some pieces are brownish and contained open corallites without intact septa. These were all thin sheets about 10 mm thick. Other pieces were thicker and larger, grayish stones whose corallites were filled in. I didn’t find much else there other than a small patch of some species of the Bryozoan fenestella a beat-up brachiopod and an even more beat-up solitary rugose coral. With only 45 minutes left, I went about ¾ of a mile north, where there’s a rough, worn-out path to the river; a path likely made by people going down to fish. Here I had more luck, finding a place I’ll return to later when I have more time. I almost immediately found two very large rocks with plenty of brachiopods in them. Unless you zoomed in very close to where my fingers touch the rock in the second picture, you are sure to have missed my favorite find. Here it is zoomed in more closely. Both valves of a fairly large Platyrachella iowensis. I was in a hurry and at first was not going to try to get it out for fear of damaging it in my rush. But with just a little gently prying with the pick tip on my rock hammer, the specimen popped out quite nicely. Here are some pics of it after I got it home: I then found a palm-sized chunk of solitary rugose coral. I’ve read that a common genus of this coral in this strata is Cystiphylloides, although I have no real basis to ID this as such. I still had about 10 minutes to pry open a few pieces of one of the large, brachiopod-filled rocks and got what I think is a species of Vinlandostrophia, as well as a few, small brachiopods that are not identifiable (to my unskilled eye).
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Greetings! I went on a quick (~60 minute) hunt today on the Iowa River in Iowa City, Iowa. The rocks there are from the Coralville Group of the Cedar Valley Formation (Devonian), mostly limestone and dolomite. I hope to post a brief summary in the Trips forum soon. I didn't find much, but one thing I did get is a large spirifer of some sort. I'm excited about it because it contains both valves, with pretty good preservation of the entire ventral valve and good preservation of one "wing" of the dorsal valve. It measures about 10 cm from tip to tip (sounds better than from cardinal extremity to cardinal extremity). Any ideas on the species? Ventral valve: Beak: Dorsal valve (the right side isn't as well preserved as the rest of the specimen): Thanks for your help!, Tom
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This gastropod was collected about a month ago in Coralville Iowa from the Cedar Valley Formation of the Devonian. I have pieced it and puttied it back together. My attempts at IDing have failed. I don't think it is a maclurite. Any experts on the Devonian life of Iowa out there??
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Why Does the U.S. Army Own So Many Fossils? Turns out massive flood control projects are a great way to find dinosaurs. by Sabrina Imbler, Atlas Obscura, August 7, 2019 https://www.atlasobscura.com/articles/why-does-the-army-own-dinosaurs Yours, Paul H.
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Last Autumn, I found a large favosite coral embedded in quite a bit of matrix. It measured 24cm by 13 cm, which is large for the location it was found in. It was only a coral, but I put quite a few hours into prepping this piece. Finally done!!!!
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A recent trip to Coralville, Iowa provided me with these coral specimens, each unique in their own way: 1. I posted this a few weeks ago prior to removing most of the matrix from it This rugosa coral was huge!! Check out the scale. 2. The next coral might be mistaken for a mushroom: Oops, I meant this one:
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After attending a field trip to the Klein Quarry in Coralville, IA, I've got several fossils that I'm not sure of. I'm fairly new to fossil hunting and my biggest fear is destroying something that would have been a nice find. This particular fossil has a lot going on on it, but I'm going back and forth on what. I've been gently removing the matrix with a soft brush on my dremel but I"m getting to delicate looking parts so until I can figure out what it might be and what the best course of action would be, I'm at a standstill. Any ideas on both possible identification and how to proceed with processing it? I tried to give an idea of size by adding a ruler but not sure how much it help. If more photos are needed, I can add more. I appreciate any feedback! Thanks so much! Update: I got more aggressive with the Dremel and used a wire brush and things are starting to make more sense now. Of course, I have a habit of seeing Trilobites everywhere but never finding any, so I ask this cautiously; Am I thinking way too optimistically to think maybe I have not only one trilobite, but a whole party of them? Here are updated photos: