U.S. Geological Survey: Science for a Changing World - USGS visual identity mark and link to main Web site at http://www.usgs.gov/

Chart showing values of delta to the thirteenth power C (left panel) and delta to the eighteenth power O values (right panel) for Globigerinoides ruber (a surface-dwelling planktic foraminifer) plotted against radiocarbon years from ODP 619A in Pigmy Basin, Gulf of Mexico

Figure 3. lower-case delta13C values (left panel) and lower-case delta18O values (right panel) for Globigerinoides ruber (a surface-dwelling planktic foraminifer) plotted against radiocarbon years from ODP 619A in Pigmy Basin, Gulf of Mexico. Figure from Poore and Wright (1999). Simultaneous excursions to smaller lower-case delta13C values and lower-case delta18O values are highlighted by bars at 7000 and 7800 radiocarbon years ago; these excursions reflect influxes of freshwater, which decreased the salinity of the surface-water layer; see text for discussion.
[View a PDF file suitable for printing]
U.S. Geological Survey, U.S. Department of the Interior
This page is https://pubs.usgs.gov/bulletin/b2187/figure3.html
Contact: Harry Dowsett (hdowsett@usgs.gov)
Last modified 09.07.01 (krw)