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I had a left over 5 pound piece of matrix sitting outside from last summer's trip to the Burlington, Iowa area. Finally this summer, I broke up the Mississippian age rock a bit, soaked it in acid for a few weeks, and then extracted these teeth from the softened matrix.
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Back in June, I posted this Burlington crinoid, wondering if it was worth prepping out. Responses were fairly cool except to say it may be worth a bit of exploration to see. @Ptychodus04 volunteered to give me a hand. He was instructed to put about an hour of work into it and then return the crinoid to me. His resulting exposure left me with the nagging question of do I go further. It was not worth professional prepping, so all summer and fall it sat on my desk begging to receive some attention. This week, I grabbed the specimen and kept whittling away at the matrix u
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Help request: feedback on layout for blastoid identification guide
pefty posted a topic in Fossil ID
Hey all, I could use some specific feedback on this visual guide I'm working on for the diverse blastoid fauna of the Burlington Formation (Mississippian, Mississippi Valley / Illinois Basin). The job of these 3 pages is to show, on each page, one of the three standard views for all Burlington species. Specifically I'd like to ask whether you prefer the horizontal layouts or the vertical ones. For some reasons I prefer vertical, while for other reasons I prefer horizontal. What do you think? Please keep in mind that these are not the only pages in the complete visual guide -- most- 3 replies
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- graphic design
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Maybe disarticulated calix plates? Maybe bivalve/mollusks? The pattern continues in the agate surrounding the bumpy areas. In a creek Burlington chert maybe.
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Wondering about the squiggle in the middle. It is the first time I have seen anything like it. I can get a picture with a jewelry loupe in a bit.
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I understand that scallops did not come about until Jurassic so can’t be what this is but I am not sure what it might be. Early Carboniferous, Burlington limestone ish maybe Fernglen? By my thumb in the first picture. Through a jeweler’s loop.
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Been finding more of this texture but this is the largest I have found and am not sure what it is. Burlington/ Keokuk 1cm at widest, second picture using a jeweler’s loop
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Burlington Limestone, Mississippian Crinoid/Blastoid Identification??
minnbuckeye posted a topic in Fossil ID
I just processed my finds from the Burlington Limestone of southern Iowa. A few finds are still not identified. My hope is that someone can recognize these specimens. First up is a find that I thought was a crinoid calyx when found. But after a good cleaning, I am wondering if it is a blastoid. The next identification needed involves these three specimens that I think are crinoid calyxes. They are markedly larger than the typical crinoid calyxes I find in this formation. If so, what species???? -
I had forgotten that a few pieces of Burlington matrix were left in some acetic acid. Found the dissolved specimens today and labeled the known ones accordingly. These SMALL specimens that are shown today are not anything I am familiar with. So it is for this reason I am seeking help!!
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The next Burlington teeth found this summer to have been termed Deltodus. My ability to differentiate Deltodus from Sandalodus, Helodus (small), and Psammodus is nonexistent. So even though labels say Deltodus, the true identity of some may be the other three genuses. I am open to any suggestions that veer away from a Deltodus ID. Like Chomatodus, Deltodus is a Chondrichthyan. There seems to be 2 general physical types. Blacker teeth seem to be larger and have smaller pores. Lighter colored teeth seem to be smaller and have larger pores. Is this a way to differentiate types??
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Every year, I take some time out to collect the Burlington Formation (Mississippian) of SE Iowa. It is about 70 ft thick in the area I hunt and the limestone is a coarse-grained rock made up mostly of crinoidal debris. Usually, my goal when visiting is to find nice examples of crinoids and brachiopods. But lately, I have taken interest in the primitive shark teeth that exist in the upper few feet of the Cedar Fork Member of the Burlington. So late summer, I threw five 25 lb rocks containing evidence of Chondrichthyan teeth into the back of my pickup to process this winter. Here is an example o
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While uncovering chondrichthyan teeth from the Burlington fish layer, I have come upon many things I can not identify. In general, the only items having a dark color in this light colored matrix are fish parts. So my assumption is that they are fish oriented...... Here are some examples of items found that are likely not fish teeth. coprolites? Dermal denticles? Just taking stabs in the dark! @Coco, don't pick on me since my measuring stick is not seen well. I will add specimen size to each for you! 1. 2.0 by 1.2 cm 2. 1.5 by 2 cm 3. .8cm
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I was working through some Burlington Limestone, Mississippian looking for the Chondrichthyan fossils found within. Most primitive shark teeth in this matrix are fairly small, which is why this unknown surprised me when discovered. My suspicion is Deltodus except for the massive size. I welcome all thoughts on this ID. Unfortunately the missing pieces were not found. @Elasmohunter, this one's for you!!!!!!!!!!
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Here is a post prep picture of Platycrinites found on a early July fossil hunt in SE Iowa (see previous trip report). These crinoids have a columnar stem with a twisted pattern, making them very interesting. My daughter can't look at it without thinking tapeworm. I have to somewhat agree but still see the beauty in this crinoid!!
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I tried my darndest to ID these fish teeth from the Burlington/Keokuk Fish Beds of SE Iowa. Unfortunately, these beds have been known since the1800s but no scientific literature has been printed since then UNTIL 2017 when our own Fossil forum Member, @Elasmohunter presented a paper for his thesis. So not much info out there. Here are my finds. I am not sure of the IDs on most of these. Each picture has a red number to respond to.
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Late last year @minnbuckeye was kind enough to send me a test tube full of fragments of teeth he collected from an exposure of the Mississippian Burlington Formation in Iowa. As part of the deal, he asked that I post photos of my better finds from the tube. These are the first Mississippian fish teeth in my collection. I am really happy with what Mike was willing to share with me and I cannot thank him enough. I also owe a big thank you to @Elasmohunter for helping me identify the finds. If you haven't seen it already, check out Mike's trip report from his hunt of the Iowa Burlingt
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In September, the desire to collect the Burlington Formation, Mississippian of Iowa got the best of me, “forced” my truck to make a little road trip down that way. The trip was about 4 hours, necessitating an overnight stay. Covid was running rampant, compelling me to sleep in the back of my pickup and eat out of a cooler full of food instead of motels and restaurants. This left a 64 year old man a bit stiff in the morning. The nice thing about the Burlington, it did not tax my body too much, allowing me hunt my allotted 8 hours with ease. Normally the Burlington is searched for crinoid specim
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The colder days of late has allowed me to work on the Burlington matrix that I brought home this summer. It has revealed some real treasures, at least for me. But I am stymied on a few finds and look for some opinions of forum members. 1. A few questions on the first piece. My goal was to clean up a large piece of ??? Shark spine? While cleaning, two teeth were uncovered. Here is the "backside" tooth. Now the "front side" tooth Initially just the tip of the tooth was showing, but as I progressed with cleaning, this "moustache" was exposed
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Hey all, hope it's ok to do 2 for 1 here. Both of these were found in a creekbed in Pike County Illinois while hunting for chert in the Burlington limestone formation. The first looks like urchins I've seen from other places but with a lot less detail. Possibly a crinoid impression below it. The second I don't even know where to start. It's a split rounded cobble with....something going on inside it. Mostly used to finding crinoids and horn corals in the area so these really took me by surprise. Thanks for looking.
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Help!!! I lost a good reference for IDing Burlington limestone crinoids and blastoids. I spent all last night fruitlessly looking for it. Does anyone have a suggestion for a good reference??? Mike
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Sometimes, when you go on a fossil hunt, you find more than just fossils. Some friends and I traveled to southeastern Iowa in Spring '18 to scour the Mississippian for fossils, but while there, we noticed that many of the homes that we drove by sported geodes in their front yards. Intrigued, we decided to investigate for ourselves. As it turns out, the area is well-known for its geodes (Iowa's state rock is the geode), so we promptly decided that we had to collect some for ourselves. We eventually found a privately owned piece of property where we could fill a bucket with geodes fo
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Hi all, I hope everyone's out enjoying their summer. I know I am, as Ive finished and mapped out a couple more spots to hunt with all this high water Missouri has. I found this recently at a new location, and I believe it to be from the Burlington Formation. It looks to me kind of like a Straparolus gastropod. If anyone else could help confirm or deny that, I thank you ahead of time! Found in Henry County, Missouri.
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