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Deep-Earth Diamonds Reveal ‘Almost Impossible’ Chemistry
Read more: Deep-Earth Diamonds Reveal ‘Almost Impossible’ ChemistryScientific American has a story about the formation of diamonds. Inclusions are imperfections in gem stones. They are tiny bits of the surrounding rock when the gem or crystal forms. Inclusions in two diamond samples from South Africa are shedding light on how diamonds form deep in Earth’s mantle. The two new diamond samples each contain inclusions of carbonate minerals that are rich in oxygen atoms (a state known as oxidized) and oxygen-poor nickel alloys (a state known as reduced, in the parlance of chemistry). Much like how an acid and a base immediately react to form water and a…
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PBS Eons: That Time Sharks Got Weird
Read more: PBS Eons: That Time Sharks Got WeirdPBS Eons has a new episode. This one is about the “Age of Sharks” or should it be the “Age of Weird Sharks”. Long before the rise of the great whites and hammerheads we know today, sharks and their cartilaginous relatives ruled Earth’s oceans and rivers in astonishing variety. It was the golden age of sharks. But why did sharks get so incredibly diverse and odd during this period, only to lose most of that diversity forever? Also, special thanks to Joschua Knüppe for providing those gorgeous faunal overviews of the Bear Gulch and Cleveland Shale formations! https://www.deviantart.com/hyrotrioskjan
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Fossil Friday #284: Alethopteris lonchitica
Read more: Fossil Friday #284: Alethopteris lonchiticaThis is the “Fossil Friday” post #285. Expect this to be a somewhat regular feature of the website. We will post any fossil pictures you send in to esconi.info@gmail.com. Please include a short description or story. Check the #FossilFriday Bluesky/Twitter hash tag for contributions from around the world! We have a very special seed fern specimen for this weeks “Fossil Friday”. It’s and old Alethopteris serlii labeled as Alethopteris lonchitica. This specimen is special on three different levels… its name, its finder, and its preserved beautifully. First, the name Alethopteris lonchitica was used by George Langford in his 1958 book…
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Throwback Thursday #284: Isabel Bassett Wasson… Trailblazer in Geology, Education, and Preservation
Read more: Throwback Thursday #284: Isabel Bassett Wasson… Trailblazer in Geology, Education, and PreservationIf you follow our Throwback Thursday “Looking Back At ESCONI” posts, you may have noticed the entry mentioning Isabel Bassett Wasson in the September 2025 post. … It left me wondering who was Isabel Bassett Wasson, what is the Trailside Museum in River Forest, IL., and Lake Chicago? We’ll tackle Lake Chicago in a later post, but here is the Trailside Museum.
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How Did Hands Evolve? The Answer Is Behind You.
Read more: How Did Hands Evolve? The Answer Is Behind You.Carl Zimmer has an interesting post about the evolution of hands. It appears it all started about 360 million years ago… Now the precise DNA-editing technology known as CRISPR is letting scientists reconstruct this ancient evolutionary change in molecular detail. It turns out that hands and feet were not the products of new genes doing new things. Rather, through natural selection, pieces of old genetic recipes for ancient body parts were cobbled together into new combinations. “It’s much easier than if you had to build from scratch,” said Aurélie Hintermann, a postdoctoral researcher at the Stowers Institute for Medical Research, in Kansas…
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ESCONI September 2025 Paleontology Meeting – “Show and Tell”
Read more: ESCONI September 2025 Paleontology Meeting – “Show and Tell”There were some very interesting things on display at the September 2025 Paleontology Meeting. The theme of the night was “Show and Tell”. We had over 20 attendees with everything from Mazon Creek to crinoids to nautiloids to a large model of a Velociraptor. John Catalani, Paleontology Study Group chairman, gave us a preview of his November presentation on Gonioceras. That’s going to be an interesting presentation. He also had a classic German paleontology journal. Tom Williams came a long way to show us some amazing crinoids and a very nice Gonioceras. I’m sorry I forgot to bring mine… Seth…
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Mazon Monday #288: Callipteridium neuropteroides
Read more: Mazon Monday #288: Callipteridium neuropteroidesThis is Mazon Monday post #288. What’s your favorite Mazon Creek fossil? Tell us at email:esconi.info@gmail.com. Callipteridium neuropteroides is one of the rarer seed ferns (Pteridospermatophyta) found in the Mazon Creek fossil deposit. Although, it is much more common in the Herrin Coal flora, if the Danville locality is truly representative of that deposit. Callipteridium jongmansi is a European species that appears to be identical. C. neuropteroides was described by Leo Lesquereux in 1879-1880. Lesquereux (1806-1889) was a Swiss-born bryologist and a pioneer of American paleobotany. He inadvertently name the Mazon Creek fossil deposit in his 1870 report “Report on the…
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PBS NOVA: Human Origins
Read more: PBS NOVA: Human OriginsPBS NOVA has a new 5 part series running on their website and Youtube. The first episode is called “Human Origins”. Check it out! Trace the remarkable origin story of Homo sapiens and the crucial moments that shaped our species. Official website: https://to.pbs.org/46djrws | #novapbs Where do we come from? To find out, journey back to a time when multiple human species walked the earth. Discover how radical fossil finds in Morocco rewrote the history of our origins – suggesting we did not have a single birthplace, but that modern Homo sapiens emerged from a mosaic of prehistoric, early human…
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ESCONI September 2025 Paleontology Meeting – 2025-09-20 at 7:30 PM – “Show and Tell” at College of DuPage
Read more: ESCONI September 2025 Paleontology Meeting – 2025-09-20 at 7:30 PM – “Show and Tell” at College of DuPageFor the newcomers, the first meeting back from summer vacation has traditionally been called “Brag Night” or “Show and Tell”. Well… The ESCONI September 2025 Paleontology Meeting will be held on 2025-09-20 at 7:30 PM at the College of DuPage Technical Education Center (TEC) Building – Room 1038B (Map). The topic of the meeting is “Show and Tell”. So, bring out your fossils, but especially bring in some cephalopods!
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Fossil Friday #283: Fossundecima konecniorum
Read more: Fossil Friday #283: Fossundecima konecniorumThis is the “Fossil Friday” post #283. Expect this to be a somewhat regular feature of the website. We will post any fossil pictures you send in to esconi.info@gmail.com. Please include a short description or story. Check the #FossilFriday Bluesky/Twitter hash tag for contributions from around the world! A nice predatory polychaete worm from Mazon Creek is this week’s Fossil Friday. Fossundecima konecniorum was known as the Simple Jaw Worm before its formal description by Ida Thompson in in 1979 in her famous paper “Errant polychaetes (Annelida) from the Pennsylvanian Essex fauna of northern Illinois. Palaeontographica Abteilung A Palaeozoologie-Stratigraphie“. That same paper established…
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Throwback Thursday #283: The Strip Mines
Read more: Throwback Thursday #283: The Strip MinesThis poem first appeared in the September 1964 edition of the ESCONI newsletter. Written by Gene Falada, it was inspired by a field trip to the spoil piles near South Wilmington, Illinois, on August 8, 1964. His words capture an experience that still feels familiar today. ESCONI field trips continue to bring people together—you meet great friends, enjoy good company, and always have fun collecting. While Mazon Creek fossil hunting has become more challenging over the years as spoil piles grow over, the thrill of the hunt and the discovery of a new specimen along with sharing it with others…
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Alabama family’s fishing trip leads to 32-million-year fossil find
Read more: Alabama family’s fishing trip leads to 32-million-year fossil findYellow Hammer News has a story about an unexpected catch on a family fishing trip in Alabama. They found a 32 million year old (Oligocene) turtle in the bank of the river. It turns out the animal was not known to science and has now been named for their family, Coleman… Ueloca colemanorum. The animal’s description was published in the journal Palaeodiversity. A South Alabama family stumbled onto quite the discovery while fishing along a riverbank — the fossilized shell of a 32-million-year-old leatherback sea turtle, according to a news release issued jointly by the McWane Science Center, Poarch Creek Indians, and…
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Weird Science: Eastern North Carolina dig led to great finds, including fossils from the age of dinosaurs
Read more: Weird Science: Eastern North Carolina dig led to great finds, including fossils from the age of dinosaursWe received this link the other day. It’s news for Wilmington, but Wilmington North Carolina not Illinois. Still, it’s an interesting story about dinosaurs and fossil collecting. A dig in eastern North Carolina last week had a scientist up to his armpits in mud, and led to some great finds for a museum collection, including fossils from the age of dinosaurs. The paleontologist that led the dig is also hoping to someday solve an enduring Onslow County fossil mystery. Christian Kammerer is the Research Curator of Paleontology at the North Carolina Museum of Natural Sciences, and he spent last week…
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Mazon Monday #287: Braceville Fall 2025 Report
Read more: Mazon Monday #287: Braceville Fall 2025 ReportThis is Mazon Monday post #287. What’s your favorite Mazon Creek fossil? Tell us at email:esconi.info@gmail.com. The Braceville Fall 2025 Field Trip was held on the weekend of September 6th and 7th, 2025. We had perfect weather… sunny with temperatures in the mid-70s. There was nearly 100% attendance. It was two days of fun in the sun! We had fossil pours on each day with contributions from Andrew Young, Chris Berg, Jeff Allen, Marty Houdek, Ralph Jewell, and Rich Holm. Thanks guys! Starting the day right! The hill seems smaller. On Sunday, we had some special visitors as some professional…
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How evolution works | Dave Hone and Lex Fridman | on Youtube
Read more: How evolution works | Dave Hone and Lex Fridman | on YoutubeDavid Hone was on the Lex Fridman podcast discussing evolution. Dave Hone is a paleontologist, expert on dinosaurs, co-host of the Terrible Lizards podcast, and author of numerous scientific papers and books on the behavior and ecology of dinosaurs. He lectures at Queen Mary University of London on topics of Ecology, Zoology, Biology, and Evolution.
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PBS Eons: That Time the Earth Was Sticky
Read more: PBS Eons: That Time the Earth Was StickyPBS Eons has a new episode. This is about Cretaceous amber… what it is, how it forms, and what is found in it. The Cretaceous Resinous Interval, a 54-million year period where amber was preserved in hundreds of locations across the world, was a gooey, gummy point in Earth’s history – and then amber suddenly disappeared for another 20 million years. So, we have to ask: what exactly made this time period so very, very sticky?
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ESCONI September 2025 General Meeting via Zoom – “Cahokia Mounds State Historic Site”
Read more: ESCONI September 2025 General Meeting via Zoom – “Cahokia Mounds State Historic Site”ESCONI General Meeting – 8:00 PM via Zoom – Dr. Angela Cooper will be presenting “Cahokia Mounds State Historic Site.” Zoom link Dr. Angela Cooper is originally from Mascoutah, IL and grew up learning about the great site of Cahokia Mounds. Her educational and professional career has centered around Illinois archaeology. Dr. Cooper received her MA from University of Tulsa studying the relationships of Hopewell sites in the Illinois River Valley. After graduation she worked as the supervisor of volunteer excavations of the East Palisade at Cahokia Mounds for two summers and worked as a Seasonal Interpreter at the site…
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Fossil Friday #282: Crossotheca sagittata
Read more: Fossil Friday #282: Crossotheca sagittataThis is the “Fossil Friday” post #282. Expect this to be a somewhat regular feature of the website. We will post any fossil pictures you send in to esconi.info@gmail.com. Please include a short description or story. Check the #FossilFriday Bluesky/Twitter hash tag for contributions from around the world! Today, we have a very nice Crossotheca sagittata. C. sagittata is the fertile form of Pecopteris fontainai (see Mazon Monday #129). See the drawings below from George’s Basement. The photo shows a specimen with both forms. This beautiful specimen was sent in by Connor Puritz. He collected it earlier this year from the…
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Throwback Thursday #282: Field Museum Postcard
Read more: Throwback Thursday #282: Field Museum PostcardI found this old Field Museum postcard at the recent ESCONI Rock Swap. It’s a photo of the coal forest in the Evolving Planet exhibit. This exhibit was originally in the Ernest R. Graham Hall in the Field Museum. The postcard is from the middle 20th century.
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Paleontologist Mark Norell (Coolest Dude Alive) RIP (1957-2025)
Read more: Paleontologist Mark Norell (Coolest Dude Alive) RIP (1957-2025)This announcement is from the Witmer Lab at Ohio University. I’m shaken by the news of Mark Norell’s passing—a good friend, a trusted colleague, and a giant in our field. Coincidentally, I got the news as I was working on my talk for the International Symposium on Asian Dinosaurs in Fukui later this month. Here’s my slide acknowledging Mark’s impact on Asian dinosaur science in general, as well as my team’s work on Asian dinosaurs in that he graciously allowed me to study and even borrow and CT scan so many of the spectacular fossils they collected. It really hurt…
ESCONI Gem, Mineral, and Fossil Show
Most Recent Post
- Fossil Friday #312: Sublepidophloios protuberans with a spray of Cyperites bicarinatus
At first glance, today’s fossil might look like a cone. But, closer examination reveals it to be a nice specimen of Sublepidophloios protuberans with a spray of Cyperites bicarinatus at the top. Sublepidophloios protuberans is a species of lycopsid branch (see Mazon Monday #316) and Cyperites bicarinatus was the sterile leaves for the Lycopsida (see Mazon Monday #69). Lycopsids were giant club mosses that existed during the Carboniferous Period. Lycopsids are still around, just not the giants.
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Field trips require membership, but visitors are welcome at all meetings!
| Friday, April 10th | General Meeting – 8:00 PM via Zoom. Jessica Hull will present “Life in the Devonian Period, The Age of Fishes.” |
| Saturday, April 11th | Junior Study Group Meeting – 2:00 PM, in person at the College of DuPage Technical Education Center (TEC) Building – Room 1038A (Map). Katherine Howard will present on Sand and Sediment Collecting. Specifics of this meeting are available from Scott Galloway, 630-670-2591, gallowayscottf@gmail.com. |
| Saturday, April 18th | Paleontology Study Group – 7:30 PM via Zoom and in person at the College of DuPage, TEC, Room 1038B (Map). Keith Robitschek will present “Digging the Marl of the Lance Formation.” |
| Friday, April 24th | MAPS Expo XLVII – Springfield, IL. |
| Saturday, April 25th | MAPS Expo XLVII – Springfield, IL. |
| Sunday, April 26th | MAPS Expo XLVII – Springfield, IL. |
| No meeting this month | Mineralogy Study Group |