Stratification and estimated paleoflow conditions for valley-fill deposits suggest that Ogallala Group streams in western Nebraska were similar to modem streams of south-central Alberta. Ogallala stratification includes medium-scale (0.5 to 2. O m thick) trough crossbedded sand and gravel, tabular indistinctly horizontally bedded and imbricated gravel, and horizontally bedded sand and pebbly sa...

Seagrass bed ecosystems occupy the most important part of coastal shelf in the French West Indies. They also constitute nurseries for many invertebrates and fishes harvested by local fisheries. In Guadeloupe, coastal fish stocks are declining meanwhile several agroecosystems revealed to be heavily contaminated by pollutants (agricultural lands, rivers, mangroves, seagrass beds, and coral reefs)...

http://dx.doi.org/10.1590/0102-311X00000616 An emblematic case of journalism that is contrary to the public interest was the coverage, by newspapers O Globo and Folha de S. Paulo about the worst socioenvironmental disaster in Brazil, which affected the municipality of Mariana, Minas Gerais State, and the entire Doce river valley, caused by mining company Samarco, a joint venture between Brazili...

Cement plants in the central Hudson River valley utilize limestones of the Helderbergian Series of the Lower Devonian. Chiefly calcilutites, calcarenites, and cherty calcisiltites, these rocks represent progressively deeper environments, from lagoonal to neritic, with scattered reef deposits. Stratigraphic continuity is marked, and a layer-bylayer analysis shows strikingly constant chemical com...