[meteorite-list] Martian Sedimentary Rocks: Where are they?

[Steve Dunklee]

sedimentary rocks be they cabonates or other oxides  when exposed to water after heating have an exothermic reaction. Thats why the same minerals are used to melt ice on roads. Any fusion crust exposed to ice or terestrial weathering would be gone in a few minutes or hours. Take a piece if bog iron or limestone and heat it to mak a crust. Then toss it in some snow. A few minutes later it has no crust. And most of it will dissolve to nothing after a few years. Sedimentary  rocks were made by and are disolved by water and weathering. Cheers Steve