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With the help of a tiny fragment of zircon extracted from a remote rock outcrop in Australia, the picture of how our planet became habitable to life about 4.4 billion years ago is coming into sharper focus.
Writing today (Feb. 23, 2014) in the journal Nature Geoscience, an international team of researchers led by University of Wisconsin-Madison geoscience Professor John Valley reveals data that confirm the Earth’s crust first formed at least 4.4 billion years ago, just 160 million years after the formation of our solar system. The work shows, Valley says, that the time when our planet was a fiery ball covered in a magma ocean came earlier...
#oldestcrust #zircon #Australia  
With the help of a tiny fragment of zircon extracted from a remote rock outcrop in Australia, the picture of how our planet became habitable to life about 4.4 billion years ago is coming into sharper focus. Writing today (Feb. 23, 2014) in the journal Nature Geoscience, an international team of ...
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Michael Tavakol's profile photoshahri a's profile photoJosselyn Ileana's profile photoMilo Ricketts-Mason's profile photo
 
Great!  too bad zircon seems to be only found in such small sizes.  It would be great if we could find large specimens of zircon.  It's also such a little time machine.
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Virtual fly-through of San Francisco Bay revealing the seafloor as if the water was drained from the Bay. The movie flies through the south and central Bay, pausing over prominent seafloor features including, large sand waves, rock pinnacles, current scour pits, as well as many human impacts on the seafloor.
http://gallery.usgs.gov/videos/536
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Ulrich Schenz's profile photoFrank Reiser M.S.'s profile photoStefan Momma's profile photoYohanes Arifin's profile photo
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+Vicky Gallardo   In terms of appropriate engineering, yes, that seems counterintuitive!
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Abstract. Various models of the origin of the asthenosphere are reviewed based on the latest observations on mineral physics of mechanical properties, melting relationships and the thermal models of t...
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Andreas “Hoize” Holzapfel's profile photoShannon Bushnell's profile photo
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Frank Reiser M.S.'s profile photoAndreas “Hoize” Holzapfel's profile photoJeanie Reséndiz's profile photoYohanes Arifin's profile photo
 
It's neat to see a geographical map with lines that represent distance from the shore, by the plates.  We are used to seeing maps with lines like these representing heights.
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Geology

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Science or Soundbite? Shale Gas, Hydraulic Fracturing, and Induced Earthquakes
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maria odete madeira's profile photoongki Ari P's profile photo
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Conglomerate rock from the local canyon shows an interesting variety of minerals including calcite and decomposed granite fragments. Behind the angle of the photo there is a large clast of what is probably dolomite.
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Very interesting 
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The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The expansion of non-vascular land plants accelerated chemical weathering and may have drawn down enou...
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Kumesha Premawansha's profile photoRich Maiklem's profile photo
 
I'm really interested in paleontology...
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