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Sharks Nearly Went Extinct 19 Million Years Ago From Mystery Event


Sharks Almost Went the Way of the Dinosaurs 19 Million Years Ago
Analysis of the fossil record shows a mysterious mass extinction that decimated the diversity of sharks in the world’s oceans, and they’ve never fully recovered.
Microscopic scales that cover the bodies of sharks, called dermal denticles, are a valuable resource for scientists studying sharks’ history.Credit.Jeff Rotman/Science Source
By Katherine Kornei
June 3, 2021Updated 2:22 p.m. ET
Extinctions that obliterate wide swathes of life have reshaped Earth’s history. Typically triggered by a massive environmental change like an asteroid impact or a significant shift in climate these events give scientists an intimate look at how life recovers after a cataclysm. Researchers believe they’ve now pinpointed a previously unknown planetary-scale reset that occurred about 19 million years ago. ....

Endangered Species , Oceans And Seas , Science Journal , Your Feed Science , அருகிவரும் இனங்கள் , பெருங்கடல்கள் மற்றும் கடல்கள் , அறிவியல் இதழ் , உங்கள் தீவனம் அறிவியல் ,

Giant Fossils Trove Found in California Declared One of the Most Significant in State History


Giant Fossils Trove Found in California Declared One of the Most Significant in State History
On 5/24/21 at 12:44 PM EDT
A petrified forest discovered by a ranger for California s East Bay Municipal Utility District (EBMUD) has yielded what SFGate calls the the largest and most diverse collection of fossils in the state s history.
Geologists and paleontologists at California State University, Chico, which has partnered with the district to excavate, identify, preserve and store the fossils, anticipate that conducting a complete inventory could take years. But they re thrilled at the prospect of building on existing knowledge of prehistoric North America.
While walking last July through the Mokelumne River watershed, a drainage basin in the Sierra Nevada foothills that provides water to 1.4 million Bay Area residents, Greg Francek noticed a petrified tree protruding from the mud. Looking around, he noticed another, and then another, and then another. ....

United States , Mokelumne River , Sierra Nevada , Russell Shapiro , Murray Kelley , Greg Francek , California State University , University Of California Museum Paleontology , East Bay Municipal Utility District , Bay Area , California Museum , Miocene Epoch , ஒன்றுபட்டது மாநிலங்களில் , மொக்கெளும்னே நதி , சியரா நெவாடா , ரஸ்ஸல் ஷாபிரோ , கலிஃபோர்னியா நிலை பல்கலைக்கழகம் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா அருங்காட்சியகம் பேலீயஂடாலொஜீ , கிழக்கு வளைகுடா நகராட்சி பயன்பாடு மாவட்டம் , வளைகுடா பரப்பளவு , கலிஃபோர்னியா அருங்காட்சியகம் , மியோசீன் சகாப்தம் ,