Article révisé par les pairs
| Résumé : | PALYNOLOGICAL data from sediment cores taken from El Junco crater lake on San Cristobal Island led to the recognition of stratigraphical fluctuations resulting from the water budget in the crater1. The results show that the crater was dry between at least 34,000 and 10,000 yr BP. Colinvaux 1 suggested that the Galapagos Islands had a dry climate during that period, because the intertropical convergence zone (ITCZ) remained north of the geographical equator. On the other hand, Newell2 showed that the ITCZ probably existed south of the equator at about that time (20,000 yr BP). © 1974 Nature Publishing Group. |
