Foraminifera are single-celled marine organisms with calcareous shells, often found in sedimentary deposits. They are widely used in biostratigraphy, paleoceanography, and climate studies due to their sensitivity to environmental changes and their extensive fossil record. Foraminifera play a critical role in reconstructing past marine environments and the history of oceanic conditions.
Reference: Murray, J. W. (2006). Ecology and Applications of Benthic Foraminifera. Cambridge University Press.