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Throwback Thursday #331: Happy (Belated) Unearth Day, SUE!
Read more: Throwback Thursday #331: Happy (Belated) Unearth Day, SUE!Last Wednesday was SUE’s Unearth Day! SUE was found by Sue Hendrickson on August 12th, 1990. Sue hung back at camp, while the rest of the team from the Black Hills Institute went to town to fix a flat tire on one of their trucks. Sue decided to explore some area around the camp. She noticed some bone bits at the base of a hill and the rest is history…
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Lost ‘mega-escarpment’ across ancient USA may explain Grand Canyon’s missing billion years
Read more: Lost ‘mega-escarpment’ across ancient USA may explain Grand Canyon’s missing billion yearsPhys.org has an interesting story about the Grand Canyon. The geologic record of the Grand Canyon spans about 2 billion years, but more than half of it is missing! This gap is known as the Great Unconformity. Now, a new study, published in the journal Geology, may have found evidence of what happened those missing rock layers. Scientists have found evidence that a colossal cliff stretching thousands of kilometers across ancient North America may have exposed the heart of the Grand Canyon nearly a billion years before it was carved by the Colorado River. The study, led by the University…
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Field Faire: A Knight at the Museum
Read more: Field Faire: A Knight at the MuseumThe Field Museum is holding another special Museum After Hours event. This one is Thursday, August 20th, 2026. Hear ye, seekers of wonder, scholars of the arts, and revelers of science and sorcery— For one enchanted evening, the hallowed halls of the Field Museum will transform into a realm of myth, merriment, and discovery for a 21+ Renaissance-inspired celebration unlike any other. Upon arrival, guests shall join one of four noble orders — Science, Record, Research, or the Dissemination of Knowledge — the founding muses upon which the museum was built, and rally behind their Champion of Discovery throughout the evening’s festivities.…
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Mazon Monday #336: 1980’s Pit 11 Collecting
Read more: Mazon Monday #336: 1980’s Pit 11 CollectingKeeping with the history theme, here’s a photo from a field trip to Pit 11 most likely from the 1980’s. You can see Braidwood Station in the background. Construction on August 1st, 1975 and completed in 1988.
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Report for the Rock, Mineral, and Fossil Swap 2026
Read more: Report for the Rock, Mineral, and Fossil Swap 2026The day started cloudy with a predictions on rain from about 9 AM to 11 AM. Unfortunately, the meteorologists were correct this time. It rained pretty steadily for more than an hour. That kept probably kept quite a few people away, but for the ones who showed, there was much fun and plenty of rocks! Here is just a small sampling of the day…
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Field Museum in the News! Paul Mayer on the Morgan Shoal
Read more: Field Museum in the News! Paul Mayer on the Morgan ShoalPaul Mayer, Fossil Invertebrate Collection Manager at the Field Museum in Chicago, IL was on “Chicago Live” recently. He was answering questions about the Silurian Rocks exposed in Lake Michigan at Morgan Shoal along the southern shoreline.
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Fossil Friday #330: Mazon Creek in the Illinois State Fair 4H
Read more: Fossil Friday #330: Mazon Creek in the Illinois State Fair 4HESCONI Junior Luke Schallhorn had his Mazon Creek Fossils 4H geology project selected as a delegate from Marshall-Putnam County to the Illinois State Fair! It was on display on Sunday, August 16th, 2026. Maybe, you saw it?!?
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Throwback Thursday #330: All Illinois Rock Swap and Silent Auction 1976
Read more: Throwback Thursday #330: All Illinois Rock Swap and Silent Auction 1976August 28, 2026 will mark the 50th Anniversary of the “All Illinois Rock Swap and Silent Auction”. It was held on August 28th and 29th, 1976 at the College of DuPage in Glen Ellyn, IL. The event was held in Parking Lot K. Long-time ESCONI member Rich Rock was Chairman. And really, who has a better name for than him to be involved in an event like this? Here is a photo of him and his grandson Pete at last year’s ESCONI Rock Swap.
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ESCONI Field Trip to Bellevue, MI Quarry on Saturday, September 12th, 2026
Read more: ESCONI Field Trip to Bellevue, MI Quarry on Saturday, September 12th, 2026A field trip to a quarry in Bellevue, MI is scheduled for Saturday, September 12th, 2026. This is a joint trip with the Kalamazoo Geological and Mineral Society (KGMS), and will be led by KGMS members. There is space for 15 ESCONI members. The trip will be from 9:30 AM ET to 2:30 PM ET. Note […]
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Reminder! 2026 ESCONI Rock, Mineral and Fossil Swap and Sale – August 15, 2026 at College of DuPage
Read more: Reminder! 2026 ESCONI Rock, Mineral and Fossil Swap and Sale – August 15, 2026 at College of DuPageESCONI is sponsoring a rock swap and sale event on August 15, 2026 at College of DuPage in Glen Ellyn. The location is Parking Lot 4, south of the Health and Science Building, and adjacent to the prairie.
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Mazon Monday #335: Richardson Collecting at Pit 11 in 1974
Read more: Mazon Monday #335: Richardson Collecting at Pit 11 in 1974A few years ago, Charlie Shabica donated a collection of historical documents to ESCONI, and these photographs were among the materials. They document a Mazon Creek field trip in July 1974 led by Eugene Richardson Jr., Curator of Fossil Invertebrates at the Field Museum.
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Behold, The World’s Oldest Amber – a Record of a World 385 Million Years Ago
Read more: Behold, The World’s Oldest Amber – a Record of a World 385 Million Years AgoScience Alert has a story about the discovery of the oldest known amber. The amber dates to the Middle Devonian Period, some 385 mullion years ago and about 65 million years older than the previous record holder. Amber is fossilized tree resin, so land plants needed to evolve before amber was possible. This particular amber was found in a coal deposit in northwest China. We tend to think of tree resin as an ancient, fragrant defense against munching insects – one that fends off pests and scabs over the wounds left by their voracious mandibles. But a new discovery suggests that these viscous…
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Rock River Valley Gem and Mineral Society Rock Swap – Saturday, September 12th, 2026
Read more: Rock River Valley Gem and Mineral Society Rock Swap – Saturday, September 12th, 2026Rock River Valley Gem and Mineral Society Rock Swap – Saturday September 12, 2026
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Fossil Friday #329: Pit 11 Roachoid!
Read more: Fossil Friday #329: Pit 11 Roachoid!This beautiful roachoid comes from ESCONI President Chris Berg. He collected it from the Pit 11. It opened up recently via the freeze/thaw method. Thanks for sharing, Chris!
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Throwback Thursday #329: Looking Back At ESCONI For July/August 2026
Read more: Throwback Thursday #329: Looking Back At ESCONI For July/August 2026The newsletters are typically sparse in the summer, but here is a bit of ESCONI history for your summer reading pleasure. 25, 50, and 70 years ago…
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Storms that built a graveyard: ancient monsoons created a spectacular dinosaur fossil site
Read more: Storms that built a graveyard: ancient monsoons created a spectacular dinosaur fossil siteThe Conversation has an interesting post about an important fossil site in northeastern Italy. The Villaggio del Pescatore site dates to 80 million years ago, which was near the end of the Cretaceous Period. Fossil animals found in the locality were swept in to the area by monsoon rains and tropical cyclones. Dinosaurs, crocodiles, and plants were preserved in river mud on a tidal flat. More details can be found in the paper “Climate-extreme-driven genesis of a Cretaceous dinosaur Lagerstätte” in the journal ScienceDirect. My colleagues and I have published a new study that reconstructs the violent tropical climate behind the Villaggio del Pescatore…
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The Best Forest Preserves Near Chicago for Hiking, County by County
Read more: The Best Forest Preserves Near Chicago for Hiking, County by CountySam S., the editor of the Chicago Signal, sent us a link to this article about hiking the forest preserves in the Chicago area. There are tips about Cook County and all the surrounding counties, even Midewin in Will County. Summer is slowly slipping away… get out there and enjoy some nature! The Chicago Signal has guides about Food & Drink, Things To Do, Real Estate & Moving, and Outdoors & Recreation. Check it out! There are roughly 70,000 acres of forest preserve in Cook County, another 26,000 in DuPage, and 31,600 across 65 sites in Lake. You do not…
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Mazon Monday #334: Mariopteris lobatifolia
Read more: Mazon Monday #334: Mariopteris lobatifoliaMariopteris lobatifolia is one of the rare species of Mariopteris. Its pinnules have a very distinctive wing-like shape. See Mazon Monday #181 for the most common variety of Mariopteris, Mariopteris nervosa.
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PBS Eons: How Pangea Upended Life on Earth
Read more: PBS Eons: How Pangea Upended Life on EarthPBS Eons has released their TV series about Pangea! Check out Episode 2 on pbs.org. In the Late Carboniferous Period, predatory amphibians and giant arthropods ruled the swamps. But ancient seed plants and amniotes were evolving adaptations to drier climates. These will help them thrive on Pangea in the Permian Period to come. This is the first our our six-part series on life and death during the Permian period. Episode 2 is available right now! Watch the full series on the PBS App https://to.pbs.org/EonsApp You can also watch on PBS.org – in particular if you’re outside of the US: https://pbs.org/eons…
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Field Museum – Legendary Late Hours – August 11th, 2026 – Riot Fest Takeover!
Read more: Field Museum – Legendary Late Hours – August 11th, 2026 – Riot Fest Takeover!The Field Museum is holding a “Riot Fest Takeover” on August 11th, 2026 from 5-9 PM. Enjoy extended museum hours from 9am to 9pm, last entry at 8pm. The Field Museum and Riot Fest are partnering up for a righteous Museum takeover from 5pm-9pm on August 11th, complete with music and some seriously sick specimens, to get you geared up for Riot Fest 2026. Our fossils are older than dirt and larger than life. Come dig in with the scientists that dig up our fossils. This event is part of our Legendary Late Hours series, included in general admission. During…
ESCONI Rock, Mineral and Fossil Swap and Sale!
Most Recent Post
- Throwback Thursday #331: Happy (Belated) Unearth Day, SUE!
Last Wednesday was SUE’s Unearth Day! SUE was found by Sue Hendrickson on August 12th, 1990. Sue hung back at camp, while the rest of the team from the Black Hills Institute went to town to fix a flat tire on one of their trucks. Sue decided to explore some area around the camp. She noticed some bone bits at the base of a hill and the rest is history…
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Field trips require membership, but visitors are welcome at all meetings!
| Saturday, July 11th | Field Trip to Mount Orab for Ordovician Trilobites Details were sent in an email. |
| Saturday, August 15th | ESCONI Rock, Mineral, and Fossil Swap College of Dupage – 9:00 AM – 3:00 PM. Details here. |
| No meetings until September | General Meeting |
| No meetings until September | Paleontology Study Group |
| No meetings until September | Junior Study Group Meeting |
| No meetings until September | Mineralogy Study Group |