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Calcite: calcite forms and is stable at the Earth's surface. Some calcite is formed from precipitation, but much of the calcite in sedimentary rocks is formed by biological activity. Many marine organisms secrete skeletal material (shells) of calcite.In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.any marine organisms secrete skeletal material (shells) of calcite. In addition to these three most abundant minerals, some sedimentary rocks also contain the iron oxides hematite and limonite, and small amounts of feldspars and micas.
Nekton, Benthos, & Plankton â Lecture Script. Marine life in the oceans includes organisms of all sizes, shapes, and character â from the smallest bacteria and. protists â single-celled heterotrophs and autotrophs visible through only the highest power microscopes â to the. largest organism on planet Earth at 100 feet long â the Blue Whale.