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Showing results for tags 'burlington'.
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@CabinetOfCuriosities recently posted a Devonian bone for identification. Having just read the post, I headed downstairs and split open a piece of matrix from the fish layer of the upper Burlington, lower Keokuk Formation and a boney looking fossil presented itself. What a coincidence! It vaguely mimics turtle remains I have found in Florida. Thoughts of what this is are welcomed!!!!!! By the way, the size is 2.5 by 2.0 cm.
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Here is another black mass that emerged from the light colored matrix of the Burlington Formation. Pareidolia has me envisioning a tooth with the enamel peeled away on top and side projections. If it wasn't so fragile, I would prep around the other side. This measures just under 2 cm.
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Identification help requested! In presumable Burlington chert (Mississippian: Tournaisian/Osagean) of east-central Missouri (Lincoln County), USA, I recently came across a mostly moldic chert specimen of what must be a bryozoan, but I do not know what early Mississippian bryozoan would possess such a robust axis devoid of zoœcia, as in the later Mississippian Lyropora. At first I was not even sure it was the bryozoan’s own axis but instead thought the bryozoan was somehow associated with an orthoconic cephalopod. Each photo below is paired with its optical inversion to help visualize what originally filled the mold. Scales in mm. The main reason I feel confident that this whole structure is bryozoan is thanks to a colleague’s find of a presumably related unidentified bryozoan, also in moldic chert presumably from the Burlington Formation but from southwest Missouri, that shows the axis and its texture much more clearly than mine. Here is that specimen, again with inversions. Again I have no knowledge of an early Mississippian bryozoan built like this. (Yes, the axis surface texture looks quite a bit like the texture along the genal rim of some Mississippian trilobites! But it also resembles undoubted bryozoan textures I’ve seen.) Identification help requested! Thanks.
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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 until I was satisfied. Does anyone have any suggestions on what type of crinoid I have? It is LARGE! 11cm long with each of the 3 columns at or a bit over 1 cm wide. It came from the Burlington Formation/ Mississippian, very likely the fish layer that separates the Burlington from the Keokuk. A little of the calyx surface features can be seen in the center of the next photo. The bumpy surface is more prominent in person than can be seen in the picture. Finally, as an extra tidbit, there were multiple teeth in the matrix. I saved the ones in this corner.
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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 of the rest of the guide shows all views for a given species together on a single page. Yet other pages show the relative or absolute sizes of the various species. You can view all the pages of this work in progress at tinyurl.com/burlblastguide Thanks for your feedback! HORIZONTAL VERSIONS: VERTICAL VERSIONS:(dragged)3.thumb.png.35426fca87f05d01f30770e3cbd6dc56.png)
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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????
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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?? The next Deltodus is my Favorite!!! Not only is it tucked underneath a large brachiopod (not really evident on these views, but the color is "rainbow" and the coloration changes as the light does. Very unique.
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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 of a rocks I have yet to process. Notice the black specks on the surface. This is what shark material looks like. Most surface teeth are worn and not worth collecting. The pristine teeth are inside. So, the next step is to break the large rock into smaller pieces in hopes to find a keeper. I use a vice to break off pieces. If a hammer is used instead, the vibrations destroy many of the fragile specimens. Every small black specks must be explored to see if they are the tip of a nice tooth. 90% of the specks are nothing but fragments. But every tenth one makes investigation worthwhile! Junk: Junk: Success!!! So as not to overwhelm everyone, I am going to show my finds in a few different posts. Images of Burlington fish on line is marginal at best. Consequently I will provide more examples than I normally would. Here are a few teasers for today.
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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 by 3.0cm 4. 1.5 by 1.2 cm 5. 1.0 by .5cm
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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. Thanks Mike Also what am I doing wrong having extraneous pictures always added at the end of my posts ( as in the ones below). I delete them and close but they reappear!
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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 Burlington Formation... His finds are really cool! My best and favorite find is probably this Orodus cf. varicostatus Orodus cf. ramosus Deltodus sp. Antliodus sp. Venustodus sp. Cladodus sp. And by far the most abundant of the teeth fragments was Chomatodus sp.
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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 specimens, but on this trip, my goal was to find the fish layer and come home with shark specimens to prep out. Success was had and I even stumbled on a few nice crinoids too, as a forum member found out The stark contrast of the dark fish parts can be seen against the whitish matrix FULL of crinoidal debris in this chunk. Extracting the teeth was very difficult due to their fragile nature. Many nice specimens were ruined as a result of my inadequate techniques. But I am proud of what I salvaged! After completing my preps, I placed the teeth in some plastic sleeves. However, I developed such a liking to the teeth that I couldn’t just bag them and file them away in my barn. So I decided to make an Iowa tooth display out of them, something that I can hopefully use on occasion for educational purposes. The result of my project is shown in the next photo. I used a red blanket from under the Christmas tree as a background. Not sure I like the Santa red so included another without it. Plus, as always, I forgot a scale!! Now I will show closeups of most specimens and attempt a CRUDE ID on them. First Cladodus???
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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 with the tooth at the very tip. I am very curious to understand this as well as what the long linear specimen is above it. 2. Looks like a trilobite eye but I will venture some type of shark tooth?? 3. The matrix where these specimens were found is white. So any time a dark spot is seen, a fossil exists, at least most of the time. Here is a dark item I assumed when I started its exposure was a tooth of some kind. But I concluded, just a "rock". After seeing it sit on the workbench for a few days, I kept thinking about the LACK of any matrix that wasn't white. So my thoughts went to the possibility of a coprolite. I will tag @GeschWhat for her opinion too. 4. Open to suggestions on this SMALL tubular structure. 5. I couldn't find a confident ID on this tooth. 6. Again, I have no clue on this one. It looks like Mickey Mouse ears, but I can't believe it since this was no where near Disneyland!
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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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