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Mazon Creek Best Of The Best Archisymplectes Rhothon Schram, 1973
RCFossils posted a topic in Member Collections
Archisymplectes is an enigmatic worm from the Essex portion of the Mazon Creek Deposit. It is always preserved as just a color difference within the concretion. Specimens are nondescript preserving a basic worm shaped body without segmentation or any other obvious structures. Some specimens preserve an everted proboscis. This proboscis is what led the original author to classify it as a Nemertean or ribbon worm. There are no clear Nemerteans known in the fossil record however there are possible candidates dating As far back as the Cambrian. Ribbon worms are fascinating creatures and hold the distinction of being possibly the longest animal known to exist. One specimen was measured at 197 feet while being less than an inch in circumference. This measurement has been questioned as their bodies are quite stretchy which makes measurements difficult. Their proboscis fills with fluid and shoots out of the oral cavity similar to the finger on a rubber glove. This is used to capture prey. Most modern ribbon worms are predators feeding fish, crustaceans, Gastropods and other worms. Some Modern ribbon worms are poisonous containing tetrodotoxin which is the same poison as in some pufferfish. Sections of the body can break off when stressed. Many ribbon worms have the ability to regenerate. It is possible to chop up a ribbon worm into many pieces forming new smaller individuals. It has been estimated that If cut up, one 6 inch worm could form as many as 200,000 individuals. Archisymplectes is rare in the Mazon deposit. -
On March first, I decided to rent a car and drive south. I'm finishing school in Chicago in May and am preparing to move west, so I really had no time to waste collecting Illinois. I hit three spots - one limestone road cut and one shale road cut in Oglesby, IL and the Mazon pits on the way back up to the city. I'm grateful to a few members for their posts and message replies regarding the road cuts, I couldn't have done this trip without them. I took off at 7 AM towards Oglesby. Here's the map, if you look at Oglesby on Google maps the location here should come together: Once you're there, it's basically a free for all. You are searching through the LaSalle Limestone Member of the Bond Formation which houses Pennsylvanian fossils. There are brachiopods everywhere you look which crumble down the hill and expose new matrix. Here are some of the Linoproductus I took home: I'll make another post for the second road cut
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- chicago
- central illinois
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Hey Folks. I’m fairly positive this is a partial tullymonster. Found it yesterday, 3/7/20 in Mazonia south unit. Thanks in advance for any confirming comments.
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- tullymonster
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Hey guys, I braved the creek yesterday on the first day of hunting season at Mazon. It was a thrilling first time getting to hunt there. These of the surface finds were pretty interesting looking and were among many duds, so I'm wondering if anyone has any ideas as to their classifications. The rest of the lot is in the freezer so look for my thread on that in a bit More concretions in the following posts: Thanks for looking!
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- concretions
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The fossil addict in me would really appreciate IDs on the following from the thrift store down the block: Mazon concretion, I thought it to be a crab at first glance but you tell me: And then this, which I couldn't peg for a mineral or some kind of fossilized pollen..... Really don't know what to think. It's about 0.5" square. Any ideas would be greatly appreciated, thanks for taking a look.
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I have been looking into getting started collecting at Pit 11 in Mazon Creek within the Braidwood-Mazon State Park. I know that there are some forms I need to complete to collect at the site. From what I’ve found, the form isn’t even on the park’s website anymore and neither is the report that the form alludes to. Are these forms still valid? Where can I find them? Are there any other rules that I need to know?
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Hey all! Just bought this piece at a rock shop here in Chicago. It was sold to me as a shrimp, the shop owner was pretty confident in this, but I'm pretty sure it's a fern instead. Not disappointed since I just appreciate the composition here, it's a super pretty one, kind of off-beat. Can anybody help ID the exact fauna? Thanks so much!
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Hello, I’ve noticed something odd with some of my mazon creek fossils that I haven’t looked at in a long time. Some of them seem to have small spots developing on them that I could swear weren’t there, say, 10 years ago. Anyone have any idea what these little circles are? There are 4 on the left Tully monster right above the white paint. And 1 on the right Tully just off the lower left edge of the body. And the white paint is a whole different issue... Open to any suggestions on how to remove that too... was thinking about rubbing alcohol. And then here is a shark egg case that seems to have a LOT of the little spots/circles. Thanks for any insight.
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Hi all Found this in Braidwood club. Has cylinder like tubes that are crystal like tubes.Input greatly appreciated.
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To those of you who are serious collectors, this is probably not thought of as an outstanding specimen, but as I'm primarily a mineral collector, I was thrilled to find this piece! I believe it's a section of Calamites, with what I consider some amazing crystallization of calcite and sphalerite.
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I am thinking that this is a Drevotella proteana, with, but not necessarily attached to, a Palaeolima retifera.
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- concretion fossil
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Coprolite?
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From a flat of specimens identified as from Pit 11. Three dimensional. Small leaf? Thanks! ~Paul
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From a flat of specimens identified as from Pit 11. Mouth looks familiar as that of Achistrum, but no dessication cracks. Looking to confirm identification. Thanks! ~Paul
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Hi all again Found this again in Wilmington sport club, Was told by a friend was petrified tree stump wanted opinions from some of you guys that might have found something like this.
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Hi all Found this again in sporting club wilmington area ,not magnetic almost Poop like
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Hey everybody! Welcome to my Mazon Creek thread, where I’ll be posting pictures of various Mazon Creek finds! I’ve been hunting there for upwards of 10 years, so I have piles of uncracked nodules just waiting to be opened. So as they open, they’ll find their way here! Feel free to jump in and add your own and keep this thread going! And I’m sure there are many that have gone unidentified, so I’ll probably need some help from the experts!
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Hey everyone, I took my first trip down to collect the famous Mazon Creek concretions over the weekend, and this is one of my first concretions to open so far. I was hoping I could ask for some clarification in what I'm seeing. My first thought was just that it's a clay deposit, because the lighter material which the crack is running through seems to be clay or another substance which is very soft and crumbly. Additionally, there are what appear to be much darker needle-like inclusions of material running randomly through that more crumbly material, which unfortunately I do not know how to photograph. On that note, my apologies for the awful cellphone photographs. I hope they're clear enough for a rough identification. The grayer material on the left is much harder, and appears to be crystalline. I was guessing possibly a shell? (replaced by quartz? does that occur at Mazon?) The white deposits (calcite?) at extreme left seem to be a separate feature from the U-shaped feature stretching across most of the concretion. Thanks so much for your time. I'll try to scrounge up an actual camera soon.
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Hi all, I have been having some trouble with this specimen. It came from a large collection of Mazon pieces I purchased a number of years back from collector Ron Brandt of Normal, Illinois, who self-collected and also purchased several extensive collections from others. Originally it was identified by someone (too far in the past) as an egg sac of some sort, but after some discussion with someone I would consider an expert, a fellow named Dan Damrow, who some of you may know, some doubt has been cast on that identification. I would be interested in any comments or insights you may have. Thanks, Paul
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Hi all, Can someone tell me whether I'm looking at a shrimp that was in the process of molting? Thanks! ~Paul
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Can anyone tell me whether this seller has these IDs right? I figured the first one looks like an Achistrum (sea cucumber) to me. The seller has others that I have questions about too but won't post them all. @RCFossils ?
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I collected some small nodules last week and when I tried to open this one the top split to reveal this. I decided to hit the larger part one more time to see if I could uncover the rest. Instead the larger piece split in half and this is what was inside the same nodule. Are these annularia? They are very different from the other fossil I found in the right picture which I am pretty sure is annularia.
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I FINALLY got something recognizable that didn't flake or crumble and now I don't know what it is. It was collected near Monster Lake in Braidwood. According to my identification book it may be a Cyperite, however, the book also says that these are "uncommon in most areas."
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I am new to the fossil collecting hobby and am attempting to open my iron concretions collected in Braidwood, IL using the freeze thaw method. I am doing it in my freezer in a single layer in a plastic shoe box. When they are thawing at room temperature the outer layers are crumbling. The nodes have not split yet. Is that normal or am I doing something wrong? Thanks.
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