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A gastrolith, also called a stomach stone or gizzard stone, is a rock held inside a gastrointestinal tract. Gastroliths in some species are retained in the muscular gizzard and used to grind food in animals lacking suitable grinding teeth. In other species the rocks are ingested and pass through the digestive system and are frequently replaced.
The discovery of the oldest known Earth rock, found on the Moon, was reported in January 2019 by NASA scientists. Apollo 14 astronauts returned several rocks from the Moon and, later, scientists determined that a fragment from one of the rocks, nicknamed Big Bertha , contained "a bit of Earth from about 4 billion years ago".
Rock art found in southeastern Venezuela may have come from a previously unknown culture. Researchers believe that the roughly 4,000-year-old art signifies a central dispersion point from which ...
The Meadowcroft Rockshelter is an archaeological site which is located near Avella in Jefferson Township, Pennsylvania. [4] The site is a rock shelter in a bluff overlooking Cross Creek (a tributary of the Ohio River), and contains evidence that the area may have been continually inhabited for more than 19,000 years.
The researchers theorize that these far-off remnants could either be deposits of silica-rich material that have hung around since the formation of the mantle four billion years ago, or areas where ...
“This time we found not just more carvings but the sculpture of a human face cut into the rock,” said Dr Oliveira, who works for the National Historic and Artistic Heritage Institute (iphan).
Quartz-pebble metaconglomerate (Jack Hills Quartzite), the rock type that contains Earth's oldest dated mineral grains (detrital zircon) Detrital zircons with ages greater than 4 billion years old have been found in these rocks, and a 4,404 ± 8 million year old zircon was found at Erawandoo Hill; [4] this is the oldest dated material originating on Earth; the date is in the Cryptic era of the ...
Dipnoan remains found at a fossil site not far from Cañon City, Colorado. [9] Remains usually in a state of rather complete preservation. [ 9 ] Halecostome remains are geographically present in the western part of Colorado, where remains have been recovered from "a level above the Mygatt-Moore Quarry."