. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. lOOOi cm Core SW 60 1°35'N,134°57'W 30 60% -i—\—\—I—\—r. Core SW 45 1°40'N,106°21'W Fig. 38. Age relations of strata in Pacific equatorial carbonate facies as shown by two cores, 3600 km apart. The 95,000-year level in core 60 is determined by the prot- actinium/ionium ratio at this level, as compared to the sediment surface. The exten- sion of the time scale beyond this age is based on extrapolation assuming a constant rate of deposition of inorganic components but allowing for the wide variability in accumulation of biot
. The Earth beneath the sea : History. Ocean bottom; Marine geophysics. lOOOi cm Core SW 60 1°35'N,134°57'W 30 60% -i—\—\—I—\—r. Core SW 45 1°40'N,106°21'W Fig. 38. Age relations of strata in Pacific equatorial carbonate facies as shown by two cores, 3600 km apart. The 95,000-year level in core 60 is determined by the prot- actinium/ionium ratio at this level, as compared to the sediment surface. The exten- sion of the time scale beyond this age is based on extrapolation assuming a constant rate of deposition of inorganic components but allowing for the wide variability in accumulation of biotic compounds. Strata interpreted as isochronous on the basis of stratigraphic correlation are marked by numbers in the graph (cf. Fig. 37). assemblages of coccolithophorids (Bramlette, unpublished). In this profile, the transition is marked by a dashed line crossing over the carbonate compensation surface. From measurements in stratum 4 the full line curve marked "Pleistocene. 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.
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