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Found 4 results

  1. With a little bit of the fern revealed I took my smallest chisel and smallest hammer to split this specimen. Width of left specimen is 5" (approx 100mm) about 25mm of fern was showing initially
  2. I have not posted in a while and wanted to share an amazing fossil that i collected in December of 2017. Sharks usually do not come to ones mind when discussing Illinois fossils. Many collectors are not aware that you can find complete shark skeletons. Illinois is fortunate to be one of the few places in the world to find complete Pennsylvanian aged sharks. The vast majority of these fossils are found within siderite concretions in the Mazon Creek deposit. These rare sharks are always found as immature individuals. Illinois also has limited exposures of black shale similar to the Mecca Quarry Shale of Indiana. This shale was extensively studied by Rainer Zangerl in the 1960s and 70s and is known for the variety of sharks that he uncovered. I have been collecting a small exposure of this shale for the past 20 or so years finding a variety of bivalves, crustaceans, nautiloids and occasional fish. Most of the fish are fragmentary and usually not well preserved. I have shared pictures of a few of the specimens I have collected in past posts. One of the most interesting fish that I have collected is a little known group of sharks called Iniopterygians. They are also referred to as flying sharks due to the unusual placement of the pectoral fins mounted high up on the shoulder. It is believed that these fins would have functioned similar to the fins in modern flying fish. They have large eyes, club like tails and very unusual tooth batteries. There are several described types mostly known from fragmentary remains. Since preservation in black shale is usually poor, most of the described specimens are x-rayed rather then prepped to help identify bones and bone structures. The specimens that I have collected have all been relatively small ranging from five to six inches. This new specimen is by far the largest and best preserved example that i have ever seen. The specimen measures a little over a foot in length. Due to the quality of preservation, I had a friend spend nearly 40 hours prepping out the fish. It appears to be quite a bit different from other examples that I have found. If anyone on the forum knows of any researchers who work with these sharks, please let me know. Enjoy!
  3. Last weekend, August 17th and 18th, 2019 was the annual I&M Canal Corridor Mazon River Fossil Trip. We were collecting Mazon Creek concretions on private property. The site is designated a National Historic Landmark and is a protected site. It's only accessible once a year by permission of the land owner. The weather was rainy in the morning for both days, but managed to clear up by 1:00, when the event began. On Saturday, Andrew Young gave an interesting lecture about the history and science of Mazon Creek fossils. He mentioned Lagerstatte, Cyclothems, Tidal Rhythmites, Braidwood Biota, and Authigenic Mineralization/Precipitation. How often do you hear those terms in one lecture? I have collected with Andrew for many years, he never fails to get you excited about collecting Mazon concretions. On Sunday, it was Dave Dolak's turn to give the opening talk. He covered the history and science from a slightly different view... also, interesting. Along with teaching geology at Columbia College in Chicago, Dave is known for his original music and songs on various Chicago subjects. Check him out on Youtube. Both speakers did a great job mixing personal experience with the actual science and history. This is a paid event and dinner is provided after collecting. The dinner is always excellent! Lecture photos. The first one is Anna Koval, President of the I&M Canal Corridor Association. Andrew Young Dave Dolak River Pictures Some already open concretions are the next post. BTW, there were a few fossil forum people there, @flipper559, @bigred97, and possibly others. Please speak up if you were also there.
  4. Bonehunter

    Another fossil plant?

    Good morning all! Had a few minutes over lunch to run to a new road cut and found this- my first impression was some form of twigs/stems without leaves, or roots, especially with the angles, as opposed to burrows, but, I've been wrong numerous times before eh? There appears to be some very faint lines associated with these (annotated picture). Appreciate any thoughts-there is the faint impression of a shell in the rock, which I believe is winterset limestone. Thanks all! Stay healthy! Bone
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