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My recent trip to the Maquoketa Formation of Iowa produced a brachiopod that baffles me. It appears to have both shells but it is extremely flat. Help needed with ID!!! Mike
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Last weekend, I decided to venture out to my favorite site to find trilobites. It is a site better visited during dry weather, but I couldn't wait! I do not know which was muddier, the truck or me when I packed it up. Here is the location without the mud visable. This material is best approached by splitting larger slabs of matrix. The result is always a bunch of trilo-bits. This is a nicer hash plate found that day
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I found a tiny object locked in matrix yesterday late in the afternoon and threw it in the bucket thinking it was a brachiopod. So when I cleaned it up a little this morning, I was surprised!! My wife fell in love with this trilobite (loves anything petite) and insisted I enter the FOTM competition. I am torn between a very small Isotelus or the more likely Anataphrus vigilans. HELP so I can enter before today's deadline (for her sake!!!).
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Graf, Iowa Orthocone Shell remnant or epibiont?
Crusty_Crab posted a topic in General Fossil Discussion
This is Isorthoceras sociale (Hall, 1877) from the Ordovician Elgin member of the Maquoketa from the well known Graf, Iowa location. They exhibit unusual preservation, including nacre and hollow camerae. According to Invertebrate Fossils (1952) by Moore, et al,, shells of nautiloids have an inner annulus layer, middle nacreous layer and outer porcelaneous layer. Is the circular pitted texture on the outside then the remnant of the porcelaneous layer of the shell or some sort of epibiont like a bryozoan? Plate 220 of Shimer and Shrock's Index Fossils o -
I'm slowly making my way through finds from the summer and have come across a couple specimens I don't recognize. The first one is from the Platteville Formation of SW Wisconsin (Middle Ordovician). The second one is from the Maquoketa Formation of NE Iowa (Upper Ordovician).
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It has been 7 years now since I became hooked on the "fossil thing". My hunts seem to creep a little further from home with each passing year. Greener pasture syndrome. So a few days ago, I purposely started my adventure close to home. Here are a few finds from the Ordovician. @ClearLake Let me start with a few unknowns: This last one could just be a squished brachiopod, but seems to be a coiled organism. IDed as Trilobite eye, probably Isotelus The pygidium pictured came from a new spot I tried, expecting to find
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These two finds are stumping me a bit. Both are from the Maquoketa Fm (Upper Ordovician) of Iowa. The first one initially struck me as a 3D graptolite, but it could be a crinoid stem. I couldn't get a good photo of the cross section, but it is rectangular.
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Found this while splitting some slabs I brought home from an outcrop of the Maquoketa Group (Upper Ordovician) in Illinois. Started a bit of prep work but figured I'd try to see what I'm dealing with before going any further. My completely uneducated guess would be a lichid pygidium or something of the sort?
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Today I decided to revisit a stream exposure of the Upper Ordovician Maquoketa Group in northern IL. I believe these outcrops are all Brainard Shale, which is the second highest member of the Maquoketa in Northern Illinois. The olive-gray shales exposed at the base of the outcrops are packed with Tentaculites, and the few times I've been here I've always searched for those. Today I wanted to explore more of the creek and see what else I could find. The stream was running pretty fast but wasn't too high, despite all the recent rain. Shale and dolomite outcrop for q
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In order to ID a find of mine, I came across an article that appears to have my answer. Does anyone possibly have access to this? I can't seem to get it: Carabocrinid crinoids from the Ordovician of northern Iowa and southern Minnesota Thanks, Mike
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I discovered these two rollers in Fayette County , Iowa in the lower Maquoketa, Ordovician. This location is well known for Anatophrus borreaus trilobites. Though the next lower formation changes abruptly to almost 100% Isotelus. Did I find one of each? Rollers make IDs tough on me. Then as long as you "trilo" experts are looking, can you ID the trilo-bits 1,2 and 3 in the next picture? Thanks for helping!!
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Due to an upcoming order from our Governor to stay at home, I took the opportunity to fossil hunt last Sunday afternoon before it begins. The ground was white with an unexpected snowfall overnight when I left the house but soon melted. My goal was to look at road cuts for rock slides from the winter's freeze thaw cycle. Digging and splitting would be tough with frost still in the ground. The first spots searched were Ordovician, Galena. Here are a few representative fossils from the Galena of SE Minnesota: From there, I slipped over the border
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Here are a few fossils I recently collected from the Maquoketa Group (Upper Ordovician) in northern Illinois that I'm not sure about. 1) Maybe some kind of trace fossil? 2) The two things in question here are to the left and right of the pentagonal crinoid columnal. The small fossil on the left looks like it might be part of a trilobite genal spine? And the three-pointed fossil to the bottom right I have no idea about. I feel like I've seen something similar before but can't remember.
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I am hoping someone on the forum is familiar with Ordovician carpoids. i collected this specimen at a roadcut in Claremont Ohio. it is from the Maquoketa Formation. Any information on what species it might be would be greatly appreciated.
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This past Sunday, I had a chance to explore a few roadcuts near Dubuque Iowa. i came across a very unusual fossil that had me stumped. After reading through an old paper, I found a match to my fossil. The guide listed the name as Climaconus. I was unfamiliar with what it might be so I did a Google search which did not yield any helpful results. I am hoping that someone on the forum might be familiar with this animal and enlighten me as to what it is. Is the name still valid? The Rock is part of the Maquoketa Formation which is upper Ordovician. It was found i
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I found this nice little Crinoid calyx at a roadcut near Dubuque Iowa. i was wondering if anyone might know what species. It was collected in the Upper Ordovician Maquoketa Formation.
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Last Autumn, I took a side trip to Graf, Iowa in search of it's "elusive" cephalopods. Fortunately for me, a large piece of rock had released itself from the overhanging cliff and I proceeded to use my sledge hammer on it until broken into eight 50 lb pieces. This then was loaded into my truck without further exploration as I knew, each chunk contained maybe 50 cephalopods within it. These chunks of matrix were to provide me with a little winter entertainment while the landscape of Minnesota remained white. Two weeks ago I began splitting these boulders, looking for the treasure
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This gastropod was found in a block of matrix from Graf, Iowa that I split open last week. I have never bumped into this type of gastropod from there before. Research has left me stumped. Suggestions are welcomed! Elgin member, Lower Maquoketa formation, Ordovician. Thanks for the help Mike
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Getting My Feet Wet In the Ordovician of Wisconsin and Iowa
RCFossils posted a topic in General Fossil Discussion
2018 was the year that I finally took some time to explore Ordovician aged sites in Southwestern Wisconsin and Eastern Iowa. Inspired by past forum posts (special shoutout to Caleb Scheer who was unfortunately taken from this world way to young) along with an invite from a fellow Fossil Forum member, I was able to make several trips into the fossil rich Platteville and Maquoketa formations. I was mainly focused on finding some of the amazing trilobites that these formations are known for. I also collected some nice representative examples of the various other fauna. Most of my e- 57 replies
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maquordovicusavanitphosphjt049-web.pdf Heyo Van Iten, Michael Lichtenwalter, Juliana de Moraes Leme,Marcello Guimarães Simões * “Possible Taphonomic Bias in the Preservation of Phosphatic Macroinvertebrates in the Uppermost Maquoketa Formation (Upper Ordovician) of Northeastern Iowa (North-Central USA)” Journal of Taphonomy, vol.4, issue 4/2006 *all diacritics omitted
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I have been to Graf, Iowa three times in the last 10 years and am always amazed at this site with the shear number of cephalopods exposed in the rock face. This fourth trip was made to find some material for a forum member. In doing so, I took the time to look closely at the matrix present at Graf. There were gastropods, brachiopods, bivalves ,graptolites, and even trilobites hidden in the rock. I had never noticed this on my previous trips since the cephalopods are overwhelming. I would love to go back another time soon and NOT look at the cephalopods at all, to see what I could find. I am h
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This past weekend, I had a chance to collect a well known roadcut outside of Clermont Iowa. The site is Ordovician in age and exposes the Clermont section of the Maquoketa Formation. one of the interesting pieces that I collected was this tiny trilobite. As you can see from the picture,There is not much to go on however the hypostome is preserved. I am hopeful the Trilobite will be complete and was wondering if anyone might know what species it is/could be. Any help is appreciated.
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Mike @minnbuckeye kindly sent me a package of orthocone nautiloids from his area recently. It's one of the taxa that are sparse in my collection so I was happy to accept the offer. I'm posting them to show what a generous guy he is and to elicit more info about them that might be missing... I don't think that big one in the lower right was labeled - Is it the same as the other large one, Elgin IA?
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@piranha, could you assist me in identifying this Isotelus to species? l
