The Mazon Creek area was once a river delta and it is true there are a lot of Fern fossils but some areas yield more marine life than plant life. It was just a matter of if you were up river more or closer to the shallow sea the river emptied into. Jellyfish actually are a "common fossil" from this area. There are also insects, crustations,worms, and sometimes fish fossils found there.
I don't live very far from the famous pit 11, and have collected at that site and some other areas of Mazon Creek. It's getting hard to find things there as it has been picked over so very much. I have for sale in my shop shrimp, ferns, wood, jellies and even a partial Tully monster. I am sorting a batch of Mazon creek concreations form an old collection. Many interesting things there. I don't have anything posted to my web site right now as I am having some trouble with it but it you're interested in something let me know, we can work something out. By the way I was very impressed with your collection.
I don't have it in front of me right now(it's at another location) but it is about 2 1/2 inches in diameter. Most found at this location are smaller than this one but I do have several in my store (I have a rock/jewelry store) that are larger. One or 2 that might be 3 to 4 inches long. They're not expensive, under $10. I don't remember the exact price on them. Thanks for the inquiry!!
Very unusual, especially with such good detail. I've seen jellyfish fossils from other locations and unless you have an expert point it out you wouldn't know it was a jelly. Here at the Mazon Creek you can actually make it out clearly. Gotta sign out shortly, keep a watch I'll get that large trilabite photo'ed and posted...it's about 8 inches long.
That was one of the most interesting things about the Mazon Creek fossils. When they where first discovered the jellyfish caused a lot speculation. Because it's a soft skined animal they are almost never preserved. I've seen some other fossil jellies and they're very hard to distingish. The Mazon's have a few variaties of jellyfish but the box jelly in my pic. is the easiest to ID By-the-way thanks for the watch!!
I don't think something big happened in this case but more like the unique conditions that happened in this certain location added up to the right combination for this TO happen. I'm not a scientist but that's the way I understand it from explinations given me by many different people; some of which are/were scientists.
I've got a little Rock shop about 45 minutes south of Chicago. Plus I'm interested in fossils, minerals and jewelry making. I'm still learning a lot about fossils, don't know anywhere near what I need to know but I've got some friends that just collect fossils and know a ton about them. How'd U take the name Lake Michigan??
Yeah!! Me to...I'm originally a far south sider...now I live FAR, FAR southside,(right out of the city) but close enought to go visit from time to time. I was in Skokie a couple weeks ago givin a demo on cabachon cutting. Anyway good typin at ya..have a good one.
Yeah! Most of the time when you see jellyfish fossils from other locations they're just like a SPLAT!!! on a background. These you can actually see details like the seperation between the body and "skirt". I have some of these for sale in my shop if your interested let me know.
I'm more or less taking the word of the scientist that discovered them...Essexalla asherae, Mazon Creek formation. It's similar in appearence to the box jellyfish found in waters by Austrailia, it has a "hollow skirt" where the tenticals would be...the tenticals possibly are in the "skirt". My image was taken on an angle so you can't see very well the seperation of the flattened D shaped body at the top of the image but there is a line of seperation where the "skirt" starts and is sperate from the body.I've included the scientific name above for you to look up on your own.
The Mazon Creek fossils are very interesting in part because it is one of the very few areas where "soft" bodied animals fossilized. There are a couple other types of jelly fish fossils found there as well. Thank you for your comments!