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The Earth Story

@earthstory / earthstory.tumblr.com

This is the blog homepage of the Facebook group "The Earth Story" (Click here to visit our Facebook group). “The Earth Story” are group of volunteers with backgrounds throughout the Earth Sciences. We cover all Earth sciences - oceanography, climatology, geology, geophysics and much, much more. Our articles combine the latest research, stunning photography, and basic knowledge of geosciences, and are written for everyone!
We hope you find us to be a unique home for learning about the Earth sciences, and we hope you enjoy!
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This is pretty magnificent - just about 2 years after flow stopped on the Lower East Rift Zone of Kilauea, walking across tephra and lava layers out to the Fissure 8 mound, pulling out an infrared thermometer, and checking the temperature of the gas vents still on the site. That's heat originally delivered during the eruption, still slowly leaking its way out. Make sure you watch the end where he gets a view from the summit of fissure 8, into its heart, down the other cones left by the various fissures, and out to the ocean.

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Let’s Go to the Beach! (of the Oligocene)

Hot enough for trip to the beach? With this photo we can visit a beach of an entirely different geologic epoch. These beach sands, once along the coast of a much older Europe, show the marks of passing waves in the Oligocene.

The Oligocene is a geologic epoch that spanned a time period between ~34 to 23 million years ago, short as epochs go but not without importance. It began with an extinction event that decimated oceanic life, thought to be caused by global cooling. Ice that had begun to frost Antarctica in the Eocene grew to an icecap.

The Oligocene is on the cusp of time half-way between us and the dinosaurs. Many mammals of the epoch resemble dinosaurs in size and lifestyle more than they do our modern mammals (http://tinyurl.com/qguu78j).

The rocks of this time period are dominated by successions of sediments, like the sandstone of this photo. Mountains were building such as the Rockies, supplying eroded material into the seas.

If you were transported back to the Oligocene you could see the emergence of grass over the landscape, small horses, and the first elephants with trunks. And like today, you could wade in sands along the coast of Greece and consider the ripple marks left by the waves of the Oligocene sea.

“Here about the beach I wander'd, nourishing a youth sublime With the fairy tales of science, and the long result of Time…” Tennyson

Annie R

Photo: mine, from field work last week in Pindos Mountains.

For Oligocene fans: http://www.ucmp.berkeley.edu/tertiary/oligocene.php http://www.bbc.co.uk/nature/history_of_the_earth/Oligocene http://www.nature.com/nature/journal/v407/n6806/abs/407887a0.html

Source: facebook.com
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