#material-stratification
#material-stratification
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#geology #deep-time #fossils #plate-tectonics #early-earth-geology #tectonic-plate-movement #urban-geology
fromArs Technica
2 weeks agoNew fossil deposits show complex animal groups predating the Cambrian
Four protrusions appear to be arranged in pairs, each consisting of two connected branches surrounding a central depression. We really don't understand what any of these features represent anatomically.
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#plate-tectonics
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fromwww.scientificamerican.com
1 month agoWhen did plate tectonics on Earth begin? New research finds some of the earliest clues
Magnetic evidence from ancient Western Australian crust reveals plate tectonics began at least 3.48 billion years ago, half a billion years earlier than previously documented.
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fromState of the Planet
1 month agoEarth's "Missing" Billion Years: Study Links the Great Unconformity to Early Tectonics
Tectonic forces from early supercontinent formation, rather than Snowball Earth glaciation, caused the Great Unconformity, a billion-year gap in Earth's geologic record.
fromMail Online
1 month agoSea fossils atop world's mountains fuel claims of Noah's Great Flood
Marine fossils have been discovered on mountain ranges around the world, including the Himalayas, Andes and Rocky Mountains, which scientists say were once covered by ancient seas before being pushed upward as continents collided and mountains formed.
OMG science
fromWIRED
2 months agoTwo Titanic Structures Hidden Deep Within the Earth Have Altered the Magnetic Field for Millions of Years
A team of geologists has found for the first time evidence that two ancient, continent-sized, ultrahot structures hidden beneath the Earth have shaped the planet's magnetic field for the past 265 million years. These two masses, known as large low-shear-velocity provinces (LLSVPs), are part of the catalog of the planet's most enormous and enigmatic objects. Current estimates calculate that each one is comparable in size to the African continent, although they remain buried at a depth of 2,900 kilometers.
Science
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fromNature
1 month agoEarth's oldest crystals suggest an early start for plate tectonics
Ancient Australian zircon crystals reveal early Earth had more oxygen and water than expected, with tectonic plate movement occurring at least 3.3 billion years ago, suggesting conditions more favorable for life than previously believed.
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