Joined August 2023
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Hello! My name is Jefferson Kim. I am a Paleontologist, Researcher, and Paleo-Nerd where I study everything and anything that pertains to Earth's prehistoric past! If you have an interest in paleontology, follow me on all the socials!
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Jefferson HJ Kim 김현준 ⛏️🦴 retweeted
30 Aug 2025
Little permian mexicoceras smithi
Also known as waagenoceras gualapense smithi
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Jefferson HJ Kim 김현준 ⛏️🦴 retweeted
The first image is a spectacular illustration by the talented artist @AndreyAtuchin. Long ago in ancient North America, two caenagnathid dinosaurs called Anzu wyliei are engaged in a dynamic behavioral display - likely involving courtship or territorial conflict - in a lush,
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Chicago Archaeopteryx | FMNH PA 830 🦴
Today is a very "birdy" #fossilfriday with the @FieldMuseum very own Archaeopteryx! This gorgeous fossil is the 14th known Archaeopteryx specimen and is by far the best preserved out of them all as it is around 99% complete! 🪶
ALT FMNH PA 830 - Archaeopteryx lithographica
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Happy #PterosaurPtuesday!
Rhamphorhynchus was a small, long tailed rhamphorhynchid pterosaur that lived during the Late Jurassic Period roughly 150.8 to 148.5 MYA in what is now the Solnhofen Limestone Formation of Bavaria, Germany.
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Happy #NationalDinosaurDay! 🦖🦕
Today we celebrate some of the most magnificent, monstrous, misunderstood, and successful group of animals to have roamed this beautiful planet some 66 million years ago. 🌍
#dinosauria #dinosaurs #dinosaur #terriblelizard
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Jefferson HJ Kim 김현준 ⛏️🦴 retweeted
May 31
420 Million years before the reign of Mamdani, two Acutiramus wake up from their daylight slumber as thousands are Eurypterus begin to invade the shallow, warm waters of New York.
This is the Fiddlers Green or Bertie Formation, a Silurian lagerstätte known for its eurypterids🧵
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Jefferson HJ Kim 김현준 ⛏️🦴 retweeted
May 29
🚨NEW STUDY DROP🚨
Very fragmentary Unenlagiid theropod is named, Kank australis, from Maastrichtian Chorillo Formation of Patagonia. This is one of the very few named from Southern Patagonia. It had very airy neck bones!
🎨: PaleoGDY Connor Ashbridge
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Happy #FossilFriday! ⚒️🦴
Couple months ago, I had the chance to visit the Morrison Natural History Museum which has a skull cast of Tylosaurus rex Specimen YPM VP 64607, nicknamed "Sophie"! 🦎
You can find Sophie at the Yale Peabody Museum!
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a BRAND new species of unenlagid theropod dinosaur named Kank australis was described!! This theropod lived during Late Maastrichtian Stage of the Late Cretaceous Period (~70 MYA) in what is now Patagonia, Argentina! 🦖
🎥 @PaleoGDY
Kank Paper Link 📝
tandfonline.com/doi/full/10.…
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Spinosaurus aegyptiacus specimen FSAC-KK-11888, nicknamed “Sobek”was first discovered in 2008 by Paleontologist Matteo Fabbri and his team as part of a larger project to support local stewardship of Morocco's natural heritage and represents a young sub-adult. ⛏️ @FieldMuseum
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🐢 Happy #WorldTurtleDay! ⚒️🦴
Archelon is the largest turtle to ever exist, reaching a maximum total body length of about 4.6 meters long (15ft) from head to tail and 4 meters long (13 ft) from flipper to flipper.
Art Credit: Peter Nickolaus
#archelon #archelonischyros #turtle
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Like modern sea turtles, they had oar-like frontal appendages specialized for swimming in the open ocean. What distinguishes them from modern marine turtles is the lack of a solid shell; rather, it had a skeletal framework which supported its leathery carapace.
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Archelon is a "Protostegid", a completely extinct, separate lineage of marine reptiles from extant sea turtles that are generally characterized by their depressed turtle body plan, complete with four limbs, a short tail, and a large head at the end of a relatively short neck.
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It had an elongated, narrow head with a hooked beak at the end similar to the beaks of parrots. It's beak & jaws combined were likely capable of delivering a powerful bite, perhaps being used to hunt large fish& cephalopods as well as in intraspecific combat.
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Jefferson HJ Kim 김현준 ⛏️🦴 retweeted
May 22
Tylosaurus rex
I have chosen the color of Drymarch Couperi as the color scheme, and this artwork is not yet completed
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The Bunker Mosasaur | KUVP 5033 🐍🦎
So recently, we got the exciting official reveal of the brand new Tylosaurus species, Tylosaurus rex! The new paper is led by Dr. Amelia R. Zietlow @TyrantLzrdQueen and provides a new interesting twist that I want to discuss for #FossilFriday
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Referred TEX Specimens 🦴
•MM-P3225 (fragmentary skull)
•FHSM VP-2496 (fragmentary skull, jaws, and partial skeleton)
•SMU 77932 (basicranium)
•SMU 77933 (parabasisphenoid)
•SMU 77672 (basioccipital)
ALT Tylosaurus Breach By DuskyVel
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Confirmed TEX Specimens (So Far) 🐍
•PMNS 8029 - "Heath" [Holotype]
•KUVP 5033 - "Bunker"
•AMNH FARB 1543
•PMNS 1126
•PMNS 18410
•PMNS 2021-03-01
•PMNS 2021-03-11
•SMU 75374
•SMU 75586
•SMU 77679
•SMU 78000
•SMU 78001
•YPM VP 64607
ALT Specimen PMNS 8029 - "Heath"
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Now how do we know that "Bunker" is TEX? Well amazingly, "Bunker" has TEX apomorphies, or derived traits that are unique to a particular taxonomic group / species. In fact, alongside "Bunker", over a dozen other specimens share similar apomorphic traits with the holotype! 🔬
ALT Specimen KUVP 5033
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