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Mazon Monday #321: So, where’s the shrimp?!?
Read more: Mazon Monday #321: So, where’s the shrimp?!?Andy Jansen wrote this article for the December 2007 edition of the ESCONI newsletter. Andy has been an ESCONI board member for many years. He’s currently our Treasurer and Librarian. If you attended our show in March, he was in his usually position at the book display and sale tables.
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A 75-million-year-old fossil reveals a shocking tyrannosaur secret
Read more: A 75-million-year-old fossil reveals a shocking tyrannosaur secretScience Daily has a story about the feeding habits of tyrannosaurs. The diet of tyrannosaurs has been long and sometimes controversial, remember when it was proposed that T-rex was a scavenger? Well a new paper in the journal Evolving Earth, found evidence of cannibalism from marks on a massive tyrannosaur foot bone. Interestingly, the marks were very small and suggest scavenging by a smaller individual.
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The Rise of Eyes Began With Just One
Read more: The Rise of Eyes Began With Just OneCarl Zimmer has an interesting article over at the New York Times. He discusses the evolution of eye… but how many eyes? Some of our early ancestors, about 560 million years ago, might have had only one. During the Cambrian Period, 518 million years ago, some early vertebrates from China may have had two pairs of eyes, one on each side and a second pair on the top of their heads.
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Fossil Friday #316: Asterophyllites longifolius
Read more: Fossil Friday #316: Asterophyllites longifoliusRecently, Marie Angkuw mentioned that she had required a large, and very sweet example of Asterophyllites longifolius. She found this specimen at an antique mall. The fossil was part of an old collection. I wonder if it was the “oldest” antique at the mall?
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ESCONI May 2026 General Meeting Friday, May 8th, 2026 at 8:00 PM via Zoom – “Seeing Beneath the Ground: Geophysics and Archaeological Explorations in Illinois”
Read more: ESCONI May 2026 General Meeting Friday, May 8th, 2026 at 8:00 PM via Zoom – “Seeing Beneath the Ground: Geophysics and Archaeological Explorations in Illinois”The ESCONI General Meeting for May 2026 will be held on May 8th, 2026 at 8:00 PM via Zoom. Thomas Loebel from the Illinois State Archaeological Survey will present “Seeing Beneath the Ground: Geophysics and Archaeological Explorations in Illinois”. Thomas will explain how archaeologists find sites, specifically how they use geophysics or remote sensing to locate sites for testing and preservation purposes.
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Trilobite Tuesday #50: Penn Dixie: Dig With the Experts 2026 – June 13th and 14th, 2026
Read more: Trilobite Tuesday #50: Penn Dixie: Dig With the Experts 2026 – June 13th and 14th, 2026The Penn Dixie Fossil Park and Nature Center are holding their annual “Dig With the Experts” event on June 13th and 14th, 2026. Details can be found be found on their website. We’ve featured a few trilobites from Penn Dixie for Fossil Friday. I went there a few years ago and had a great time. If you love trilobites, don’t miss this event!
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Mazon Monday #320: A shoot at the root? Unique development and evolution of the stigmarian apical meristem
Read more: Mazon Monday #320: A shoot at the root? Unique development and evolution of the stigmarian apical meristemOur friends at the Field Museum have been busy… this time it’s paleobotany. The paper “A shoot at the root? Unique development and evolution of the stigmarian apical meristem” was published in the journal Proceedings of the Royal Society B a few days ago. The authors should be familiar… Michael P. D’Antonio, C. Kevin Boyce, Michael P. Donovan, and Fabiany Herrera. Michael D’Antonio, Michael Donovan, and Fabiany Herrera work at the Field Museum, while C. Kevin Boyce is at Stanford University. All have been referenced in posts on our website.
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Keweenaw Week 2026 – August 2nd – 9th, 2026 in Michigan’s famous Keweenaw Peninsula
Read more: Keweenaw Week 2026 – August 2nd – 9th, 2026 in Michigan’s famous Keweenaw PeninsulaThe Copper Country Rock and Mineral Club is holding their annual Keweenaw Week for 2026 from August 2nd – 9th, 2026 up in Michigan’s famous Keweenaw Peninsula. Tickets are on sale now on this website. You can find out more on their website at https://ccrmc.info/.
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PBS Eons: How Dinosaurs May Have Cursed Us With Aging
Read more: PBS Eons: How Dinosaurs May Have Cursed Us With AgingPBS Eons has a new episode. This one is about how aging in mammals might be due to evolved traits while we lived alongside dinosaurs.
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Fossil Friday #315: Eubleptus danielsi
Read more: Fossil Friday #315: Eubleptus danielsiEubleptus danielsi belongs to the Palaeodictyoptera an extinct order of medium-sized to very large, primitive Palaeozoic paleopterous insects. E. danielsi was described by Anton Handlirsch in 1906. Handlirsch (1865 – 1935) was an Austrian entomologist, who worked extensively on many insect orders. He did significant work studying of fossil insects. Handlirsch described E. danielsi in “Revision of American Paleozoic insects. Proceedings of the United States National Museum“.
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ESCONI Field Trip to Braceville, IL for Mazon Creek Fossils – Saturday, May 30th and Sunday, May 31st, 2026
Read more: ESCONI Field Trip to Braceville, IL for Mazon Creek Fossils – Saturday, May 30th and Sunday, May 31st, 2026The ESCONI field trips to Braceville for Mazon Creek fossils are set for May 30th and 31st, 2026 from 9 AM to 3 PM. You can attend one or the other, but not both days. There is an attendance limit of 50 people each day. You must register to go on this trip. See rule 6 below for instructions. This is the ONLY way to register.
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Throwback Thursday #315: Empire Quarry in Bloomington, Indiana
Read more: Throwback Thursday #315: Empire Quarry in Bloomington, IndianaAtlas Obscura has an interesting post about the Empire Quarry located in the area of Bloomington, Indiana. This quarry supplied the 18,630 tons of stone used to build the Empire State Building in the 1920’s. Indiana is known for its rocks. Some of the world’s finest limestone hails from the area surrounding Bloomington and Bedford, Indiana. Many of our iconic building are constructed of Indiana limestone, including the Empire State Building, the Washington National Cathedral, the Pentagon, and many current state capital buildings.
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PBS Eons: When the Earth Had Supermountains
Read more: PBS Eons: When the Earth Had SupermountainsPBS Eons has a new episode. This one is about some truly giant mountains and the evolutionary changes they drove.
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Science Quickly: The dinosaurs at your window: How birds survived the asteroid that killed all other dinosaurs
Read more: Science Quickly: The dinosaurs at your window: How birds survived the asteroid that killed all other dinosaursScientific American’s “Science Quickly” had an interview with Steve Brusatte on a recent episode. Steve’s new book “The Story of Birds” is available to day April 28th, 2026.
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Mazon Monday #319: ESCONI Braceville Trip Spring 2005
Read more: Mazon Monday #319: ESCONI Braceville Trip Spring 2005Our spring trip to Braceville Spoil Pile is coming up in May. The sign-up will kick off very soon. We have been going there for many years. For the spring trip in 2005, Barbara Brotman, a reporter for the Chicago Tribune was there to talk to a few ESCONI members and talk about ESCONI.
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Early Triassic Cyclidan Crustacean Had Powerful Jaws
Read more: Early Triassic Cyclidan Crustacean Had Powerful JawsSci-News has an article about a distinctive, but enigmatic, group of arthropods called Cyclidans. Cyclidans appeared during the Carboniferous and hung around until the Late Cretaceous.
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Science Quickly: The fans who went from collecting Pokémon to studying bugs and fossils
Read more: Science Quickly: The fans who went from collecting Pokémon to studying bugs and fossilsScience American’s “Science Quickly” had a recent episode about the upcoming Pokemon display at the Field Museum. Arjan Mann, Field Museum Curator of Early Tetrapods, was one of the guests.
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Fossil Friday #314: Kellibrooksia macrogaster
Read more: Fossil Friday #314: Kellibrooksia macrogasterFor today’s fossil, we have a beautiful specimen of Kellibrooksia macrogaster, which was a species of mantis shrimp (see Mazon Monday #105). This rare animal was described by Frederick Schram in 1973. It was named in honor of Harold Kelly Brooks, who published the first well-illustrated modern account of Mazon Creek crustaceans. A pdf of his work is available. Have a look as it has some amazing illustrations! This contribution comes from Alan Keith. Alan is a very serious Mazon Creek collector. He travels up here from Texas multiple times each year to collect concretions he can process back home. Thanks for sharing,…
ESCONI Gem, Mineral, and Fossil Show
Most Recent Post
- Mazon Monday #321: So, where’s the shrimp?!?
Andy Jansen wrote this article for the December 2007 edition of the ESCONI newsletter. Andy has been an ESCONI board member for many years. He’s currently our Treasurer and Librarian. If you attended our show in March, he was in his usually position at the book display and sale tables.
- About ESCONI
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- Mazon Creek
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- Trilobite Tuesday
Field trips require membership, but visitors are welcome at all meetings!
| Friday, May 2nd | Field Trip to Danville, IL. Details here. |
| Friday, May 8th | General Meeting – 8:00 PM via Zoom. Thomas Loebel will present “Seeing Beneath the Ground: Geophysics and Archaeological Explorations in Illinois”. |
| Saturday, May 9th | Junior Study Group Meeting – 2:00 PM, in person at the College of DuPage Technical Education Center (TEC) Building – Room 1038A (Map). “The Rock Cycle and Sedimentation” Specifics of this meeting are available from Scott Galloway, 630-670-2591, gallowayscottf@gmail.com. |
| Saturday, May 16th | Paleontology Study Group – 7:30 PM via Zoom. John Catalani will present “An Ordovician Konzentrat Lagerstätte: The Dixon Mifflin Residuum Fauna”. |
| Saturday, May 23rd | CGMA Show, Kane County Fairgrounds |
| Sunday, May 24th | CGMA Show, Kane County Fairgrounds |
| Saturday, May 30th | Field Trip to Braceville, IL. Details here. |
| Sunday, May 31st | Field Trip to Braceville, IL. Details here. |
| No meeting this month | Mineralogy Study Group |
