. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. CHAP. 33] THE PRESERVED RECORD: PALEONTOLOGY OF PELAGIC SEDIMENTS 869 Hasle (1959) have reported that the numbers of coccolithophorids in the upper 100-200 m of tropical to subantarctic waters are of the order of thousands/ml. Bramlette (1958) estimated that in typical Quaternary calcareous ooze fi-om the tropical Pacific, coccolithophorids constitute 10-15% of the total calcium carbonate of the sediment, and that in many early Tertiary calcareous oozes and chalks, coccoliths and related forms account for about 50% of the
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. CHAP. 33] THE PRESERVED RECORD: PALEONTOLOGY OF PELAGIC SEDIMENTS 869 Hasle (1959) have reported that the numbers of coccolithophorids in the upper 100-200 m of tropical to subantarctic waters are of the order of thousands/ml. Bramlette (1958) estimated that in typical Quaternary calcareous ooze fi-om the tropical Pacific, coccolithophorids constitute 10-15% of the total calcium carbonate of the sediment, and that in many early Tertiary calcareous oozes and chalks, coccoliths and related forms account for about 50% of the total calcium carbonate. In recent years it has come to be generally recognized that practically none of the calcium carbonate in deep-sea sediments is of inorganic origin^electron microscope examination has revealed that the fine-grained calcium carbonate previously loosely described as "impalpable" is formed principally of fragments of coccolithophorids. "Coccolithophorids" in this context is used to embrace the true coccolithophores, known from plankton. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
Size: 1707px × 1464px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
