Rock (geology) arkoses (12%). Sedimentary rocks often contain fossils. Sedimentary rocks form under the influence of gravity and typically are deposited in horizontal or near horizontal layers or strata and may be referred to as stratified rocks. A small fraction of sedimentary rocks deposited on steep slopes will show cross bedding where one layer stops abruptly along an interface where another layer eroded the first as it was laid atop the first. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was
Heat Shield Rock not. Following the identification of Heat Shield Rock as a meteorite, five similar iron meteorites were discovered by "Opportunity" (informally named "Block Island", "Ireland" "Mackinac Island", "Oileán Ruaidh" and "Shelter island"). Two nickel-iron meteorites were identified by the "Spirit" rover (informally named "Allan Hills" and "Zhong Shan"). One nickel-iron meteorite was identified by the "Curiosity" rover, tagged "Lebanon." In addition, several candidate stony meteorites have also been identified on Mars. The term "Martian meteorite" usually refers to something entirely different: meteorites on Earth which are believed to have originated from Mars, a famous example being ALH84001. Heat Shield Rock Heat