Revised Chronology of Neogene DSDP Holes from the World Ocean: Lazarus et al., 1995



The following table gives all bio-, magneto- and isotope stratigraphic data used in the age-depth plots of Chapter 7. A header line or lines precedes the data for each hole. The header gives a date for the initial creation of the file, the initials of the person or persons who collated the data for this hole (provided by the individual taxonomic specialists), and, optionally, a short comment. Data lines include the Hole name, data type (normally, D-diatom, F-planktonic foraminifers, M-magnetostratigraphy, N-calcareous nannofossil, R-radiolarian), plotcode used to label the event on the age-depth plots, calibrated age or age range (from Chapter 4), and depths in section bracketing the event. Many events compiled from the stratigraphic range charts of the initial reports are entered in their original sample name format of Core-Section,interval. 'CC' refers to a core-catcher sample. Data can be either in event format (one, rarely 2, calibrated ages, followed by the samples bracketing the event) or in zonal format (2 age entries giving the age range of the zone or indicator species, followed by a single sample name). The computer program used to read these files and create age-depth plots automatically assigns symbols and colors in the order in which new group symbols are encountered. To maintain consistency in plotting, in most files at least one line was entered for each of the 5 standard data types most frequently encountered - D,F,M,N, and R. A blank data line was entered, with age and depth values of 0, for data types not available for the hole. For sources of data, see Chapter 2. Additional explanation of data formats can be found in Lazarus (1992a), and in the 'Users Guide to Age Depth Plot', included on the distribution disc of the ADP program.

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