Now let's look at Keigwin's justly famous Sargasso Sea dO18 proxy temperature reconstruction: (1996) «The Little Ice Age and Medieval Warm Period in the Sargasso Sea» Science 274, 1503 - 1508 This isn't meant as a general criticism, however, the
reconstructed Sargasso Sea
paleotemperature rests on Globigerinoides ruber calcite.