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The vents evidence comes from NASA's Mars Exploration Rover Spirit. The robotic explorer found deposits of pure silica, a form of the element silicon that occurs when hot water reacts with rocks (quartz is a pure silica), in Mars' Gusev Crater in 2007.
The discovery was announced briefly at the time, but scientists have now had time to fully analyze the deposits. The results are detailed in the May 23 issue of the journal Science.
From near the summit of Husband Hill, Home Plate was observed to have color differences around its rim fromwest to east (Figure 4) [Farrand et al., 2008], a finding corroborated by later HiRISE orbital imaging. On closerexamination, Home Plate was found to be a1 to 2 m tall,80 m diameter light-toned, subcircular platform of finelylaminated, massive, and cross-bedded dark-toned strata covered by lighter-toned dust [Squyres et al., 2007]. First approached at the northwest scarp, Spirit examined a2mtall section of Barnhill outcrop that comprises two units: alower, laminated, coarser-grained unit and an upper finer-grained cross-bedded unit (Figures 2b and 2c).
originally posted by: UpIsNowDown
Organic Rocks you say
Organic sedimentary rocks are sedimentary rocks formed from the remains of organisms. The three types of organic sedimentary rock are limestone, chert and coal. Both limestone and chert are formed largely from the hard structures of organisms, while coal is formed from dead plants after a long period of exposure to the correct environmental conditions.
Bony fish, corals and certain planktonic algae form calcium-based structures that break down and settle to the ocean floor after their deaths. These build up under time and pressure, eventually solidifying into a solid mass known as limestone.