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2. Geological history of Mars - Wikipedia

   en.wikipedia.org/wiki/Geological_history_of_Mars

   Pre-Noachian: the interval from the accretion and differentiation of the planet about 4.5 billion years ago to the formation of the Hellas impact basin, between 4.1 and 3.8 Gya. [13] Most of the geologic record of this interval has been erased by subsequent erosion and high impact rates.

3. Beaches on Mars Once Rivaled Those on Earth - AOL

   www.aol.com/news/beaches-mars-once-rivaled-those...

   Earth may be home to the most glorious beaches in the solar system today, but 3 billion years ago, Mars might have claimed the crown. That’s the conclusion of a new study in the Proceedings of ...

4. A rover has been collecting rocks from Mars for years. How ...

   www.aol.com/news/rover-collecting-rocks-mars...

   The bottom of the Jezero Crater – believed to have formed 3.9 billion years ago from a massive impact – is considered to be among the most promising areas on Mars to search for evidence of ...

5. Mars carbonate catastrophe - Wikipedia

   en.wikipedia.org/wiki/Mars_carbonate_catastrophe

   The Mars carbonate catastrophe was an event that happened on Mars in its early history. Evidence shows Mars was once warmer and wet about 4 billion years ago, that is about 560 million years after the formation of Mars. Mars quickly, over a 1 to 12 million year time span, lost its water, becoming cold and very dry.

6. Gale (crater) - Wikipedia

   en.wikipedia.org/wiki/Gale_(crater)

   The crater formed when an asteroid or comet hit Mars in its early history, about 3.5 to 3.8 billion years ago. The impactor punched a hole in the terrain, and the subsequent explosion ejected rocks and soil that landed around the crater. Layering in the central mound (Aeolis Mons) suggests it is the surviving remnant of an extensive sequence of ...

7. Ancient volcano on Mars once erupted for 2 billion years straight

   www.aol.com/news/2017-02-07-volcano-on-mars...

   While meteorites in the same family as NWA 7635 were all dated about 500 million years old — meaning they were formed from cooling magma on the surface of Mars circa half a billion years ago ...

8. Valles Marineris - Wikipedia

   en.wikipedia.org/wiki/Valles_Marineris

   Mars is much less tectonically active than Earth, and marsquakes are unlikely to have provided seismic waves of the required magnitude. [10] Most sizable craters on Mars date to the Late Heavy Bombardment , 4.1 to 3.8 billion years ago (the Noachian period), and are older than the landslide deposits in Valles Marineris.

9. Common surface features of Mars - Wikipedia

   en.wikipedia.org/.../Common_surface_features_of_Mars

   Chaos regions formed long ago. By counting craters (more craters in any given area means an older surface) and by studying the valleys' relations with other geological features, scientists have concluded the channels formed 2.0 to 3.8 billion years ago. [51]