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  1. Ruger9a

    What is this???

    Does anyone know what this concretion is? It came from Mazon Creek and was listed as a Unusual Rock concretion fossil. I purchased it ten years ago and am hoping others like this have been found since then and a description determination has been made. Help.
  2. TheRocksWillShoutHisGlory

    Is this Artisia?

    Taking another look at an Annularia (I believe sphenophylloides?) I saw a curious pattern in the corner and I was looking for some help identifying it. I was thinking it could possibly be Artisia?
  3. Last week I made my third annual pilgrimage back to the Chicago area to visit family, do a little fossil hunting, gorge myself on great ethnic foods and treat myself to some Chicago-style deep-dish stuffed pizza for my birthday--yum! I had hoped to pick up some more Pit 2 (Braidwood Biota) Mazon Creek nodules from Fossil Rock campground in Wilmington but sadly it is now closed and up for auction with the distinct possibility that it will never again allow fossil hunters to gather nodules from the spoil piles at the back of the campground. Instead, I figured on focusing back on the Pit 11 (Es
  4. TheRocksWillShoutHisGlory

    Another Mazon Creek Collection

    Long time lurker and just want to start sharing my finds and collection as you have kept my interest with all yours. To begin, some Mazon Creek finds: an arachnid which I believe is Terpsicroton and a shrimp (I'm bad with shrimp species). Both negative halves.
  5. Paleozoic insects can be extremely difficult for an amateur collector to identify. Partial specimens, poor preservation and outdated publications make it nearly impossible to identify most specimens to the species level. To further compound the problem, many species names are synonymous and no longer valid. In my future posts on Mazon insects, I will not attempt to identify specimens beyond the family level unless I have a firm identification. Geraridae are known from many Paleozoic sites around the world. The first Gerarus specimens were described in 1885 by Scudder from specimens
  6. There are 3 species of centipede described from the Mazon Creek Deposit. Mazoscolopendra is one of 2 described Scolopendromorphs. The second being Palenarthrus impressus. The main difference being Mazoscolopendra having 21 body segments and Palenarthrus having 23. It is interesting to note that while centipede translates to 100 feet, all known centipedes have an odd number of segments. Mazoscolopendra is essentially indistinguishable from modern day scolopendromorphs. Modern types have Front legs modified into fangs that inject venom into their prey. Some species are known to
  7. This middle Pennsylvanian concretion from Mazon Creek (Francis Creek Shale), was discovered in the fall of 2013 in pit 2. Pill Bug (Pill Millipede) Phylum: Amynilnilyspes Class: Diplopoda Order: Amynilyspedida Amynilyspes wortheni
  8. Just joint and wanted to get my first entry in. This middle Pennsylvanian concretion from Mazon Creek, was discovered in 2015 in pit 2, in an area I call Ivy Ridge thanks to all the Poison Ivy in the area. The finger near the top right should be where the shark emerged. I did not find this shark egg case variety posted. I hope this helps in future identification. Eventually I will be getting the measurement blocks. Shark Egg Case Phylum: Chordata Class: Chondrichthyes Palaeoxyris multiplicatum Horseshoe crab Phylum: Arthopoda Superclass: C
  9. I had a few duds pop open yesterday but saw one had a tiny speck of something on it, no more than a millimeter long. I had my digital microscope out for other microfossiling activities and decided to take a look. Nothing super interesting, just a tiny plant fragment. But it did get me curious if anyone has done micropaleontology work on Mazon Creek material? I would think there would be quite a bit to explore, but that said I've never really seen the topic mentioned. The only microfossil I've seen discussed from Mazon Creek is a species of ostracod, but usually the onl
  10. This middle Pennsylvanian concretion from Mazon Creek (Francis Creek Shale), was discovered in the fall of 2013 in the Mazon Creek Heritage Site. Whip Scorpion Phylum: Arthropoda Class: Arachnida Order: Uropygi Geralinura sp.
  11. Managed to stop in for a little Mazon Creek style Easter egg hunt when I was up in Chicago last June. Brought back maybe a gallon or so of concretions and I've been cycling them in my freezer (when I remember). I like to give them a bit of a (gentle) tap around the edges from time to time. This often helps the concretion to shed an outer layer or to coax a split that is nearly there and just begging to pop. As expected, I've had a number (the majority) of concretions open up to reveal a complete lack of anything at all within. The only thing that revealed itself to be of interest was this lit
  12. Rockpit

    Unique Mazon Creek

    After being in and out of the freezer since October this concretion opened yesterday. It is different than anything I've seen before and I haven't been able to match it to anything online or in Wittry's books. I am assuming it is fauna but I'm really not sure. Of course it could be a jellyfish but I've never seen one like this before. Could it be a cephalopod?
  13. A few weeks ago Mrs R was asking me about TFF. General questions about members and their collections. I did not realise she was fishing for some Christmas gift ideas. I showered her a few of our members collections and she really liked Ralph’s thread “Sometimes You Have To Whack It !!” So yesterday I was very surprised to unwrapped a nice little collection of Mazon Creek fossils . I don’t think there is any rare specimens and unfortunately there was no IDs included. Mazon Creek material is quite rare to pick in the U.K. so she did brilliant and I was very spoiled. I will have to check Ralph’
  14. flipper559

    Mazon Creek - Wood ? Bark ??

    Odd looking piece found in the Mazon Creek . Looks to be bark ?? Any ideas ?? Thanks, Phil
  15. GallinaPinta

    Opened mazon creek nodule

    Hey, i just opened a mazon creek nodule with my hammer with a few light taps (since a month going in and out the freezer didnt seem to work) and i found these balls inside. Are they the actual fossil or are the specimens inside the ball? Any answer is appreciated!
  16. flipper559

    Mazon Creek - seed pod ? cone?

    Found this piece in a spoil pile, just the way it is, minus the dirt. Seems to be something, but I can't find any reference. Any ideas ?? I was thinking some kind of seed pod, or cone perhaps ?? Thanks for any help !! Phil
  17. Below is the fertile fern found in pit 2 fall 2019. It was identified by Fiddlehead early this December as being Crenulopteris mazoniana. The significance being the rarity of fertile ferns in the Mazonia fossil flora. Hope to gain more information on this specimen in the new Flora book once publish.
  18. This middle Pennsylvanian concretion from Mazon Creek (Francis Creek Shale), was discovered in the fall of 2014 in the Mazon Creek Heritage Site. I could use some help identifying. The preservation is not the best. I see no indication of the existence of wings but I sense there were some.
  19. Looking to trade for some Mazon creek fossils. Nothing too fancy, but I’d be happy to look at anything you have (besides Essexella). I have some soft bodied animals as well as trilobites from Chengjiang and other lower Cambrian formations in China, as well as a bunch of unprepped material (corals, brachiopods, trilobites) from Paulding, OH and Penn Dixie, NY. PM me if you’re interested and I can send some pictures. Thanks.
  20. Does anyone have a map demarcating the different Peabody Coal pits in Illinois (i.e. the pits where Mazon Creek fossils are found)? I can't seem to find one online.
  21. This is an interesting animal that many are not even aware exists in the Mazon Creek deposit. It is a fossil gooseneck barnacle named Illilepas damrowi. Barnacles are known from as early as the Cambrian but are relatively rare in the fossil record. A barnacle is actually a crustacean and are distantly related to lobsters. Modern gooseneck barnacles also have a similar taste to lobster. Like all gooseneck barnacles, Illilepas has a stalk like body and a calcareous head region consisting of plates called a scotum and Tergum. In life, the animals appendages would extend out
  22. I just received this nice Aviculopecten bivalve from Mazon Creek today. What catches my eye is the thing extending from the top of the shell. It almost looks like it could be the siphon protruding outwards. I haven't seen a similar specimen before. Any thoughts?
  23. The Mazon Creek Deposit is known for many enigmatic creatures. Esconichthys is one of them. The animal has a tadpole shaped body with a usually well preserved pair of eyes. Some specimens preserve 2 pairs of long external gills. Muscle segments called myomeres are sometimes present on laterally preserved specimens. What makes it unusual is that it does not have paired fins. It was originally suggested that Esconichthys may be a larval lungfish or possibly an amphibian. Later studies have stated this is unlikely without offering an alternative placement. Du
  24. connorp

    Mazon Creek Unknown

    This nodule split a while ago. At first I thought it was just a neat looking dud, but after looking closer there appear to be faint radiating lines on the specimen which makes me think it might be plant material, although I have no idea what exactly. Any ideas?
  25. There are currently 3 recognized species of horseshoe crab known from the Mazon Creek deposit. Of these 3, Liomesaspis is the rarest. They are only known from the Braidwood (non marine) portion of the deposit. The most defining feature is the bulbous cardiac lobe. The few specimens that I have seen are often poorly preserved.
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