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In the past, geoscientists thought of ocean sediments as mostly fine-grained, floating in the water column and settling like a slow "rain" on the sea floor, Moscardelli explained. But we now know it's not the only possible scenario.
"We know that 'submarine landslides' can transport big boulders--sometimes as big as a house--for hundreds of kilometers into the deep-water of the Earth oceans," she said. "Imagine a huge landslide affecting the entire state of Texas, but happening in the ocean."
In her new study, Moscardelli documents several sites where these events have occurred on Earth, such as the Pennsylvanian Jackfork Group of south-central Arkansas; the outcrops of the Guandacol Formation in the Pangazo Basin, Argentina; or in the Santos Basin, offshore Brazil. She even shows that these underwater events can affect huge areas, as with a massive landslide that covered thousands of square kilometers in the Barents Sea, north of Russia, about a million years ago.
Some scientists have suggested that the boulders of Mars's northern plain could be the product of meteorite impacts. But to Moscardelli, that's not a fitting theory.
"That's possible for some of the boulders, especially those found close to craters," she says. "But how do you explain boulder fields that can cover thousands of square kilometers without any impact craters around? The submarine hypothesis provides a feasible alternative."
Interesting hypothesis. One thing I wonder, was Mars red back then, or did the redness develop later on, when the planet dried up? The artist's interpretation may need to include more grey than red.
It needs to be noted that even if there was plentiful water on Mars, it doesn't imply Earth-like appearance with forests and grasslands. Life on Mars might have never had a chance to evolve beyond simple microorganisms, or to evolve at all.
One thing I wonder, was Mars red back then, or did the redness develop later on
In the rendering, a huge ocean fills one side of the planet, feeding one of the longest valleys in the solar system, Vallis Marineris. The peaks of Mars’ huge volcanoes — Olympus Mons, Pavonis Mons, Ascraeus Mons and Arsia Mons — dominate the Tharsis Bulge with their peaks poking above the atmosphere. Gill imagined that the high-altitude equatorial volcanic region would likely be a desert where little vegetation would grow, whereas lower latitudes would support a wetter climate boosting the presence of greenery.
I read somewhere that the red pigment is iron oxide. Perhaps Olympus Mons blew, that would certainly kill off a planet.
reply to post by weirdguy
Iron Oxyde equals Rust :
How is rust formed :
Plain-old iron looks shiny black. The element only takes on a reddish tinge when it has been exposed to oxygen, and enough oxygen at that for it to become iron(III) oxide, an atomic fivesome composed of two iron atoms and three oxygen atoms. So why did so much of the iron on Mars' surface oxidize, or gang up with oxygen...?
Link here : www.space.com...
More answers can be found by simply Googling
What a sad bunch of people the "Rock" and Arken debunkers are... (IMO)
Shame on some people for not having a more open minded approach...
Arken, you have contributed so well to everything that has to do with the planet Mars and even if some of your threads may have been proved to be wrong, I would like to personally thank you for such dedicated and well written threads.
As usual... DENY IGNORANCE... (If you cannot, why be here?)
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