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ESCONI Gem, Mineral, and Fossil Show
Most Recent Post
- Throwback Thursday #310: History of the Thornton Quarry
Ran across this interesting episode of “It’s History” on Youtube…. “Why This Highway Runs Through Chicago’s Biggest Hole”. It’s about the Thornton Quarry and one of the founders of Chicago, Gurdon Saltonstall Hubbard, who is the namesake of Hubbard Street in Chicago.
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- Throwback Thursday
- Trilobite Tuesday
Field trips require membership, but visitors are welcome at all meetings!
| Friday, March 13th | General Meeting – 8:00 PM via Zoom. Jeffrey Amelse will be presenting “Archaeological, Geological, and Other Historic Sites in Portugal.” |
| Saturday, March 14th | Field Trip – “Escape the Excavation: A hands-on archaeological adventure” – College of DuPage, 1pm – 3pm. Details here. |
| Saturday, March 21st | 66th ESCONI Gem, Mineral, and Fossil Show at the DuPage County Fairgrounds. Details here. |
| Sunday, March 22nd | 66th ESCONI Gem, Mineral, and Fossil Show at the DuPage County Fairgrounds. Details here. |
| No meeting this month | Mineralogy Study Group |
| No meeting this month | Paleontology Study Group |
| No meeting this month | Junior Study Group |
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Throwback Thursday #310: History of the Thornton Quarry
Read more: Throwback Thursday #310: History of the Thornton QuarryRan across this interesting episode of “It’s History” on Youtube…. “Why This Highway Runs Through Chicago’s Biggest Hole”. It’s about the Thornton Quarry and one of the founders of Chicago, Gurdon Saltonstall Hubbard, who is the namesake of Hubbard Street in Chicago.
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This crocodile ran like a greyhound across prehistoric Britain 200 million years ago
Read more: This crocodile ran like a greyhound across prehistoric Britain 200 million years agoScience Daily has a story about a newly discovered Triassic reptile from the UK. The animal, Galahadosuchus jonesi, lived about 215 million years in what is now Gloucester, UK. It was probably a fast, land-dwelling predator.
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2026 ESCONI Gem, Mineral, and Fossil Show Recap – Displays and Demonstrators
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show Recap – Displays and DemonstratorsWell, that sure went by fast! We put in quite a bit of work to get ready and then it was over in a flash. The results and photos are still coming in, so we’ll do the recap in a few posts. We hope you made it out and had a great time. Please, send feedback to esconi.info@gmail.com or esconiclub@gmail.com.
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Mazon Monday #314: Smithixerxes juliarum
Read more: Mazon Monday #314: Smithixerxes juliarumThis is Mazon Monday post #314. What’s your favorite Mazon Creek fossil? Tell us at email:esconi.info@gmail.com. Smithixerxes juliarum is among the rarest animals found in the Mazon Creek fossil deposit. It belongs to an extinct group of arthropods known as the euthycarcinoids, which ranged from the Cambrian to the Triassic periods. Some researchers believe euthycarcinoids may have been amphibious, capable of venturing between water and land. A few species of euthycarcinoids are known from Mazon Creek, including: These fossils are exceptionally rare within the Mazon Creek biota. In fact, in the comprehensive 1985 study titled “Biota of a Pennsylvanian muddy coast:…
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Live Auction Items For Sunday
Read more: Live Auction Items For SundayHere are the live auction on Sunday, March 22nd at 11:30.
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Scenes from Day 1 of the 2026 ESCONI Gem, Mineral, and Fossil Show
Read more: Scenes from Day 1 of the 2026 ESCONI Gem, Mineral, and Fossil ShowWe had a great day today at the 2026 ESCONI Gem, Mineral, and Fossil Show. Hopefully, you were able to join us. We had more attendees at day 1 than we had for both days last year! There were great friends and great times… it’s always fun to catch up with everyone! There were great things to buy at the 20+ vendors at this years show. We had some great auctions, both live and silent… hopefully, you were able to win something beautiful. And, there was great weather… how can you beat 80 degrees in March?!?
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ESCONI Gem, Mineral, and Fossil Auction Items
Read more: ESCONI Gem, Mineral, and Fossil Auction ItemsHere are the Live Auction Items.
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Today is the Day! ESCONI Gem, Mineral, and Fossil Show!
Read more: Today is the Day! ESCONI Gem, Mineral, and Fossil Show!Here are some scenes from the show setup… just 2 hours to showtime!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #40: Mazon Creek Asterophyllites and a Sphenopterid in a Riker Mount
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #40: Mazon Creek Asterophyllites and a Sphenopterid in a Riker MountLast preview… a Riker Mount with a Mazon Creek Asterophyllites and a Sphenopterid… both are beautiful fossils. Today is the day… come out at 10 AM and see all the auction items for yourself!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #39: Fluorite and Sphalerite
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #39: Fluorite and SphaleriteOne last chunk of beautiful fluorite… nice purple crystals on a bed of sphalerite. Sounds and looks tasty! If you are up this late (or is that early), you deserve a tasty preview… just a few hours until the show starts!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #38: Reticulopteris munsterii var. dawsonii from Mazon Creek
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #38: Reticulopteris munsterii var. dawsonii from Mazon CreekHow about another Mazon Creek seed fern? This one is Neuropteris jacksonii (see Mazon Monday #250). If you are reading this… today is the day!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #37: Alethopteris serlii from St. Clair, Pennsylvania
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #37: Alethopteris serlii from St. Clair, PennsylvaniaThis preview is of a chunk of shale from St. Clair, PA. This piece contains numerous examples of Alethopteris serlii, a seed fern also found in Mazon Creek localities. We are getting very close now… inside 12 hours away!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #36: Purple Fluorite from Cave-in-Rock, IL
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #36: Purple Fluorite from Cave-in-Rock, ILHere’s yet another beautiful chunk of fluorite from Illinois. This one is purple and was collected from Cave-in-Rock, IL. many years ago. Come and see it tomorrow… less than a day away!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #35: Priscacara, sp. from the Green River Formation in Wyoming
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #35: Priscacara, sp. from the Green River Formation in WyomingWhat fossil show is complete without a Green River fish? Here is a nice Priscacara, sp. These fish date to the Eocene, about 50 million years ago. We have other Green River fish, come on out and see them!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #34: Giant Moroccan Trilobite
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #34: Giant Moroccan TrilobiteHow about a giant Moroccan trilobite for something different? Come on out… we will have other trilobites at the show.
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #33: Laveineopteris rarinervis from Mazon Creek
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #33: Laveineopteris rarinervis from Mazon CreekThis is a beautiful specimen of Laveineopteris rarinervis (see Mazon Monday #81) a seed fern commonly found in the Mazon Creek fossil deposit. Come on out and check it out tomorrow!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #32: Calcite from Ourey, Colorado
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #32: Calcite from Ourey, ColoradoTime for another beautiful mineral specimen. This is calcite from Ourey, Colorado. Come on out tomorrow… there is something for everyone!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #30: Mazon Creek Achistrum, sp. Colony
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #30: Mazon Creek Achistrum, sp. ColonyAnother Mazon Creek beauty… this is a nice Achistrum, sp. colony, which is a sea cucumber. You can see at least three mouths in the fossil. See Mazon Monday #29. Come on out and see for yourself, tomorrow, yes, tomorrow! Less than a day away!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #31: Crinoid Plate from the Bangor Formation in Northern Alabama
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #31: Crinoid Plate from the Bangor Formation in Northern AlabamaAnother crinoid plate from the Bangor Formation in Northern Alabama. This plate has multiple crinoids and other fossils like Archimedes bryozoans. Tomorrow is the day!
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2026 ESCONI Gem, Mineral, and Fossil Show – Preview #29: Crystalline Copper from Southwest Africa
Read more: 2026 ESCONI Gem, Mineral, and Fossil Show – Preview #29: Crystalline Copper from Southwest AfricaThis chunk of crystalline copper is from southwest Africa. Tomorrow is the day!