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- Olcott, Alison N.; Sessions, Alex L.; Corsetti, Frank A.; Kaufman, Alan J.; Oliviera, Tolentino Flavio de
- Science 2005 v.310 no.5747 pp. 471-474
- biomarkers; carbon; eukaryotic cells; euphotic zone; glaciation; ice; latitude; microbial ecology; photosynthesis; photosynthetic bacteria; primary productivity; rocks; surface water; Brazil
- ... Laterally extensive black shales were deposited on the São Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation [approximately]740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a compl ...
- Asner, Gregory P.; Knapp, David E.; Broadbent, Eben N.; Oliveira, Paulo J. C.; Keller, Michael; Silva, Jose N.
- Science 2005 v.310 no.5747 pp. 480-482
- tropical rain forests; logging; tropical forests; remote sensing; deforestation; Brazil; Amazonia
- ... Amazon deforestation has been measured by remote sensing for three decades. In comparison, selective logging has been mostly invisible to satellites. We developed a large-scale, high-resolution, automated remote-sensing analysis of selective logging in the top five timber-producing states of the Brazilian Amazon. Logged areas ranged from 12,075 to 19,823 square kilometers per year (±14%) between 1 ...