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  1. Antonjo

    Echinoid ID

    Found recently in Split, Croatia, near Adriatic sea, on hill called Marjan Location If someone can tell the species? Thanks
  2. I have been fortunate to hunt Mazon Creek fossils for nearly 40 years. I have collected Many tens of thousands of concretions. I have also purchased premium specimens from other collectors. In the past, I have posted many of these specimens on the forum. I have decided to start posting more in depth descriptions of some of the amazing animals that can be found in the MC deposit. All specimens that I will post are from my personal collection. The first animal that I will highlight is the holothurian or sea cucumber Achistrum sp. Sea cucumbers are a common animal in today’s oceans but quite rare in the fossil record. The Marine (Essex) portion of the Mazon Creek deposit is one of the few places in the world where complete body fossils of these animals can be collected. These worm like animals are actually a type of echinoderm and show 5 radial body elements that run the length of the animal. Well preserved specimens will show a sac like body and an oral ring preserving approximately 15 calcareous plates. Occasionally the intestinal tract and other internal features will be preserved. Just like modern sea cucumbers, Achistrum sp had a leathery body covered in “J” shaped sclerites or Sigmoid hooks. Often times, detecting these under a microscope is the best way to identity poorly preserved specimens. As the animal dried out, the skin would crack and these cracks were eventually replaced by calcite. This gives the body of Achistrum sp a septarian like appearance. While modern sea cucumbers have retractable tentacles surrounding the mouth, none have been observed in Achistrum sp. The animal can reach length of over 15 centimeters however most found average under 10 centimeters. Achistrum is relatively abundant and are occasionally found in masses of multiple individuals. Despite many thousands of specimens collected, Achistrum has never been formally described. At one time it was believed that there may be as many as a dozen different species of sea cucumber found in the Mazon Creek deposit. This has been reduced to one or possibly two different types. This first image shows an exquisite specimen that I collected at Pit 11 in 2017. it is a complete animal and preserves evidence of some unusual muscular structure in the esophagus area that I have not seen before.
  3. An acquaintance of mine bought this at the Tucson gem and mineral show two years ago. He is now interested in selling and I am interested in buying. The price seems fair but of course the big question....is it real? I may add is it all real, is it a composite of different pieces, or is it a fabrication/replica? The whole piece is close to 15 inches at the tallest point, and close to 13 inches at the widest point. Thank you for your help.
  4. Monica

    Hungry Hollow echinoderm

    Hello there! This past Saturday, I went on a "field trip" to Hungry Hollow near Arkona, Ontario (mid-Devonian in age), and I found one weird item. It's an echinoderm of some sort, but which sort? A crinoid holdfast? Something else? Please see the photos below and let me know what you think. (By the way - I didn't make it home from work in time to take photos in natural light today, so I apologize for the fairly poor photo quality - if it's sunny tomorrow I can get better pictures then. And I also apologize for my blue finger in the photos - my students and I were looking at cheek cells under the compound light microscope today and some methylene blue got on my fingers - oops!) One end showing the pentaradial symmetry: The other end not showing much: Side photos: Thanks for your help! Monica
  5. Hi all, It's been a while since I posted a trip report but I was feeling like posting last evening as well as testing out my new photography rig. I moved houses two years ago and lost my lovely brick wall backdrop (the exterior of back of the house) which allowed photography in natural light. The new house is all vinyl siding outside and I have more shade so less opportunity for good sunlit pictures. However, one corner inside the house has a bricked area where a wood burning stove used to be so I have decided to set up some lights there. The pics came out ok so let's proceed with the report. I recently went up to the St. Mary's quarry in Bowmanville, Ontario on a scheduled trip with the local Scarborough club and also stopped off at Arkona while in Canada. I did pretty well at Arkona where I found four Eldredgeops trilobites and two Blastoids among other finds. Nucelocrinus elegans from the Hungry Hollow member of the Widder formation. Sorry, no pics of the Trilobites due to some back spasms but I got these pics of a nice Atactotoechus fruiticosus branch also from the Hungry Hollow Member of the Widder formation. Then I went to the St. Mary's quarry on Sunday where I took a tumble down the rock pile and hurt my ribs. Lucky for me my hard hat took the brunt of the impact my head made with the rocks. With nothing broken and still able to move around, I stayed closer to the ground and found this partial, eroded Isoltelus sp. that is inverted and still shows the Hypostome in place. I also found a plate with Graptolites but that was too heavy to hold and photograph last night. I'll post it tomorrow maybe. Finally, I drove home on Monday and stopped off at a place in New York where some of the Kashong Shale member of the Moscow formation is exposed and found these two surprises. A cephalon of a Dipleura dekayi with some of the shell material eroded away. I think the eye is intact and waiting to see again once some rock is removed. And here is a closeup of the shell on top where you can see the stippled pattern where sensory pits used to be. Lastly I found a pygidium that I am not sure of the genera on. Possibly a Basidechenella sp.? So not a bad trip at all, despite the injury. Good news is that I am healing nicely but still have some soreness and muscle spasms. I'm looking forward to my next trip up in the spring and hopefully will avoid the health scares.
  6. JUAN EMMANUEL

    Camptostroma roddyi

    From the album: Echinoderm Collection

    Camptostroma roddyi (Hundt, 1939). Kinzer formation, Bonnia-Olenellus Zone, early Cambrian. Found in Lancaster County, Pennsylvania, US. Bought as Ebay purchase. This animal is about 4cm in diametre. An early Cambrian echinoderm that is called a stem echinoderm as it is said that many types of echinoderms arose from this animal. This species is the only animal in the family of its own, Camptostromatoidea.
  7. JUAN EMMANUEL

    Belochthus orthokolus

    From the album: Echinoderm Collection

    Belochthus orthokolus (Bell, 1976). Found in the Verulam formation, Gamebridge, Ontario, Canada. Middle Ordovician. Obtained online as a purchase. The edrio is about 1.8 cm long.
  8. pjullien

    Echinoderm??

    I have found 2 invertebrate fossils that I haven't found before. They appear to be five-sided and one shows a star fish pattern on the top. The bottoms are curved and smooth. The dimensions are about 0.5 cm in diameter and 1 to 2 mm in thickness. Any help in identifying would be greatly appreciated as usual. (The rocks from the lake are from the Pennsylvanian period). Are they a type of echinoderm? The shape and characteristics of the underside seem a bit odd-could it be a central part of an echinoderm? Another question that comes to mind is why are they so similar yet one lacks the five radial lines visible on the other?
  9. sloth

    Burrowing echinoderm?

    From the album: Macro Florida Fossils

    I found this whale vertebrae with a lot of burrowing damage. I'm not sure if these pebbles I found inside are rocks or echinoderms.
  10. I don't know whether I should have put this in the ID section instead, as I'm looking for some info and for help in sorting out what I've got, but not necessarily IDs per se. But it's also a sort of show-and-tell, so here goes. The info I'm trying to sort out has to do with the locations and formation/stages of some of the items. To help, I'll post the Ordovician correlation chart from the ICS and this other one from a paper on the Valongo (Portugal) site recently posted in the Documents section, showing the known soft-bodied sites of the Ordovician... The latter seems a little too tidy, with the deposits fitting exactly within the given stages, but maybe it will be of some help:
  11. A family of amateur fossil hunters from Utah -- the Gunthers -- found this fascinating fossil in the Spence Gulch shale part of Utah in 1992, and shared it with Richard Robison at the University of Kansas. The mystery of what it was went unsolved for nearly 30 years, until a team at Ohio State uncovered the telltale circle that showed the creature had attached to a shelly surface via a basal disc. It's the earliest/one of the earliest known specimens of a mat-sticker making the evolutionary move to attaching to a harder surface--a leap that makes some of our modern-day echinoderms, including sea cucumbers, possible. They recently published their findings in the Bulletin of Geosciences but this discovery wouldn't have been possible if the Gunthers hadn't found the fossil in the first place. Just fascinating stuff. (story here: https://news.osu.edu/scientists-discover-evolutionary-link-to-modern-day-sea-echinoderms/),
  12. Scottnokes2015

    Crinoid from Fern Glenn For, Missouri

    Hi everyone, I was out on a collecting trip this weekend around the Fern Glenn Fm, St Louis, Missouri. I came across this which I think is Crinoid related but I've never seen one with the little spikes sticking out. It's about 3/8th inch diameter by about 3/16 inch thick. Can anyone give me any ideas of the species. Thank you
  13. Hello everyone, these fossils are quite common in at least one Czech locality of Bohdalec formation (upper Caradoc/Beroun) and I wondered if anyone has seen anything similar somewhere. The fossils are lentil shaped, with a thin egg-like shell that could be cracked and removed to expose inner layer of different color and structure. The size is 1 to 4 mm in diameter. I've consulted some experts and although they've all encountered similar fossil, they have no idea what it is. One of the opinions was that it could be a juvenile cystoid of some sort, for example Echinosphaerites seems to be common in this formation, although never found on this locality. However no one seems to have done any research into this yet. Associated fauna are small cyclopygid and illaenid trilobites, small brachiopods, graptolites, bivalves and ostracods. Thanks in advance for your thoughts Ondrej
  14. KimTexan

    Need a cidarid echinoderm ID

    I found this little jewel a while back, but never found out what species it is. Can anyone tell me what genus species it is? This is a close up of an ambulacral and pore area. I don’t think I can get much better on the close up picture quality. I do have a number of pics from other angles if needed. Thanks in advance for your input.
  15. Rowboater

    rapp creek hunting

    Deer season has ended so I figured I wouldn't bother the hunters or get shot if I went back to the creek. Clearly others had been working some of my favorite spots, there were new pieces of screening rolled up and deposited nearby. Most kids are looking for big, but seem to be few interested / obsessed (more interested in games on their phones). The day was cold (the cold water, which is up, was warmer than the air. Lots of tiny freshwater shrimp/ mysis and bright red (freshly shed?) crayfish. Found the usual, though not many drum teeth, lots of sand shark (one seems a bit thick and heavier than usual?) and lots of broken angel shark, spikes and ecphora pieces. No cowshark, will try again! There's a broken tiny sand dollar-like piece near the penny (I had posted a whole one before). Will post a picture on the ID section along with a broken tooth I don't recognize.
  16. From the album: MY FOSSIL Collection - Dpaul7

    Pentremites Blastoid echinoderm fossil Kentucky, USA Early to Middle Carboniferous, from 360.7 to 314.6 years ago Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm. Often called sea buds, blastoid fossils look like small hickory nuts. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian. Blastoids persisted until their extinction at the end of Permian, about 250 million years ago. Although never as diverse as their contemporary relatives, the crinoids, blastoids are common fossils, especially in many Mississippian-age rocks. Kingdom: Animalia Phylum: Echinodermata Class: Blastoidea Order: Spiraculata Family: Pentremitidae Genus: Pentremites
  17. From the album: MY FOSSIL Collection - Dpaul7

    Pentremites Blastoid echinoderm fossil Kentucky, USA Early to Middle Carboniferous, from 360.7 to 314.6 years ago Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm. Often called sea buds, blastoid fossils look like small hickory nuts. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian. Blastoids persisted until their extinction at the end of Permian, about 250 million years ago. Although never as diverse as their contemporary relatives, the crinoids, blastoids are common fossils, especially in many Mississippian-age rocks. Kingdom: Animalia Phylum: Echinodermata Class: Blastoidea Order: Spiraculata Family: Pentremitidae Genus: Pentremites
  18. Found as surface float at the bottom of the Windom exposure. Reference: Wilson, K. A. “Field Guide to the Devonian Fossils of New York” (2014). Paleontological Research Institution Special Publication No. 44.
  19. elcoincoin

    Echinocorys gravesii 2 - view1

    From the album: Haute Normandie - may 2017

    Echinocorys gravesii, an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
  20. elcoincoin

    Echinocorys gravesii 2 - view 2

    From the album: Haute Normandie - may 2017

    Echinocorys gravesii, an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
  21. elcoincoin

    Echinocorys gravesii 4

    From the album: Haute Normandie - may 2017

    Echinocorys gravesii, an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
  22. elcoincoin

    Echinocorys gravesii 2 - view 3

    From the album: Haute Normandie - may 2017

    Echinocorys gravesii, an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
  23. elcoincoin

    Echinocorys gravesii 5

    From the album: Haute Normandie - may 2017

    Echinocorys gravesii, an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
  24. From the album: Haute Normandie - may 2017

    A group of Echinocorys gravesii , an irregular ursin from Les Petites Dalles, Normandy - Cretaceous - coniacian
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