The deltas suggest a river transported clay minerals into the basin from a watershed.

BBC: Water 'widespread' on early Mars

Densely populated, low-lying areas, such as large river deltas and small islands, are at the greatest risk from flooding.

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Deltas like the one at Eberswalde, with their silty, gently deposited sediments, are often the best places to preserve organic remains.

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There is no sign that the Yangtze or Pearl River deltas, or the Beijing-Tianjin corridor further north, are running out of steam.

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The region has been unable to match the success of the Yangtze and Pearl River deltas in attracting investment in low-technology, labour-intensive private industry.

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"The only thing I know is what's happened to my buddies at the Deltas and Uniteds, " says Mr. Regan, who is a captain of Boeing 737s.

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An example of this would be if you did purchase 10 of the August 20 calls, you would have 10 calls with a .50 delta or 500 deltas.

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She added that the deltas appeared to be excellent candidates for finding stored organic matter, because the clays brought in from the watershed and deposited in the lake would have trapped any organisms, leaving a "cemetery of microbes".

BBC: Water 'widespread' on early Mars

One day, I flew due west from Anchorage to the town of Bethel, on the flat, drab sprawl of waterlogged tundra that reaches between the deltas of the Yukon and Kuskokwim Rivers to the shore of the Bering Sea.

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In a separate study published in the journal Nature Geoscience, a team led by Bethany Ehlmann, from Brown University, analysed sedimentary deposits in two deltas within Mars' Jezero crater - which once hosted a body of water measuring some 40km (25 miles) across.

BBC: Water 'widespread' on early Mars