Eridania Lake is a hypothesized ancient lake on Mars with a surface area of roughly 1.1 million square kilometers.
[2][3][4][5] Later research with CRISM found thick deposits, greater than 400 meters thick, that contained the minerals saponite, talc-saponite, Fe-rich mica (for example, glauconite-nontronite), Fe- and Mg-serpentine, Mg-Fe-Ca-carbonate and probable Fe-sulphide.
Such a process, classified as hydrothermal may have been a place where life began.
[6] Some sources say clay deposits can be up to 2 km thick.
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