Layered sedimentary rocks in Meridiani Planum. Ah, the loveliness of Meridiani. Meridiani Planum is a plain located south of Mars’ equator, in the westernmost portion of Terra Meridiani. It hosts a rare occurrence of gray crystalline hematite, which on Earth, often forms in hot springs or in standing pools of water. Hmmm….
HiRISE Picture of the Day archive [More at links]