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I know this may be a far-fetched idea, but perhaps it's worth thinking about it?
originally posted by: gortex
a reply to: jeep3r
I don't think it's far fetched at all , it's believed Mars was Earthlike for 2 to 3 billion years , life on Earth started after about a billion years and arose from the seas so I see no reason it couldn't have started on Mars around that timescale in the Martian seas.
Interesting comparison shots.
originally posted by: jeep3r
a reply to: audubon
To me it seemed to be the faint outline of a crater rim at first. Possibly an early impactor from the Noachian or Hesperian period. Or could it be the edges of an ancient reef? They apparently do tend to form circular ridges at times, but it's difficult to say.
I hope this thread will help shed some light on whether ancient reefs could leave behind traces that are visible on the macro-scale. Any further thoughts and ideas are of course welcome!
Mars, like Earth, appears to have experienced global climate changes over the past few million years. The effects of Earth’s ice ages are well recorded in polar ice in Greenland and Antarctica. Similarly, layered deposits in both polar regions on Mars (see above) appear to record ancient Martian climate variations. Changes in the tilt (relative to the Sun) of the rotation axes of both Earth and Mars are thought to have influenced their climates, but these changes were larger in the Martian case.
For this reason and because of the apparent lack of recent oceans and life on Mars, it should be simpler to determine the causes and history of climate changes on Mars. HiRISE is returning images of the polar layered deposits on Mars that have the potential to help to unravel Mars’ climate history.
Most Mars researchers believe that the polar layered deposits are the result of variations in the amounts of dust and water ice deposited over many climate cycles, but the amount of time needed to form individual layers remains a major uncertainty. Studies of the thickness of polar layers are limited by image resolution. Are thinner layers present, but not visible in the images returned by previous Mars missions? HiRISE is expected to answer this question and better determine the thickness of layers in the polar deposits.
Analysis of HiRISE data should result in a better understanding of the timescales involved in the deposition of the layered deposits and provide important information regarding the climate history of Mars.
originally posted by: wildespace
Viewing the images at their original scale may also give you a better perspective. Here's the "curved segment" at the original image scale, at 50 cm/pixel resolution