710 resultados para 1225
Resumo:
Preliminary analyses of 56 samples from the upper 49 meters of Hole 480 (Cores 1-11) show marked changes in pollen frequencies and concentrations. The largely varved cores (1, 2, 3, 10, and 11) are characterized by low concentrations and pollen types such as Gramineae, Low-spine Compositae and Cheno/Ams. The largely homogeneous section (Cores 3 through 10) contains higher pollen concentrations and is dominated by TCT (probably Juniperus) and Artemisia. Picea pollen is also present in this section. The record as a whole is thought to represent most of the last glacial cycle.
Resumo:
A detailed study of chemical and mineral compositions of ferromanganese encrustations indicated that their variability dependent on composition of host substrate and on geological and oceanological processes.
Meteorological observations during PRINCIPE cruise from La Coruña to La Habana started at 1785-12-18