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Blue gemstone is oldest known piece of earth

A 4.4-billion-year-old gem found on an Australian sheep ranch is the oldest known piece of Earth yet found. Scientists using two different age-determining techniques have shown that a tiny zircon crystal found on a sheep ranch in Western Australia is the oldest known piece of our planet, dating to 4.4 billion

Lost continent discovered in Indian Ocean

Researchers have found evidence of an ancient lost continent in the Indian Ocean that "drowned" during continental shifts 85 million years ago. A well-known tourist destination, Mauritius is located about 1,200 miles (2,000 kilometers) off the coast of Africa, east of Madagascar. Scientists think the tiny island formed some nine million

Roman marker used to measure Earth found in Italy

Researchers in Italy have found the marble marker once used to measure the shape of the Earth in the 19th century. Placed there by Father Angelo Secchi (1818-1878), a pioneer of astrophysics, the marker consisted of a small travertine slab with a metallic plate in the middle. The plate featured a

Iron Age slag shows earth used to have stronger magnetic field

An analysis of Iron Age slag, leftover from ancient copper smelting, shows that Earth's magnetic field was strong and more variable 3,000-years-ago than previously suspected. The Earth’s magnetic field comes from the movement of molten iron in the core. The field’s strength and structure are constantly changing. But paleomagnetists (scientists

Fossil record pushed back 70 million years

The discovery of 650-million-year-old sea sponge fossil has pushed the fossil record for life on earth back 70 million years. The prior oldest known hard-bodied animals were reef-dwelling organisms called Namacalathus, which date to approximately 550 million years ago. Disputed remains for other possible soft-bodied animals date to between 577

Oldest remnants of Earth found in Arctic rocks

Scientists have found rocks in the Arctic that contain chemical signatures that date back to just after the Earth's violent origins. The signatures found in Arctic lavas are more than 4.45 billion years old. By comparison, the Earth is 4.54 billion years old, only slightly older.The oldest surviving remnants of

The earth is younger than previously thought

A new geological study has found that the eatch is 4.537 billion years old, making it 70 million years younger than previously thought. To confirm Earth's age, the team compared elements in its mantle to those in meteorites that are the same age as the Solar System. The group reports