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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.
the aggregate of organisms that inhabit continental and marine bodies of water and that drift under the influence of currents. Plankton consists of both plantsâphytoplankton (including bacterioplankton)âand animalsâzooplankton.It is distinguished from organisms found on the bottom, or benthos, and from free-swimming organisms, or nekton.lankton. see marine biology marine biology,study of ocean plants and animals and their ecological relationships. Marine organisms may be classified (according to their mode of life) as nektonic, planktonic, or benthic. Nektonic animals are those that swim and migrate freely, e.g......