Abstracts » Zoology and wildlife conservation

A record of Permian subaqueous vent activity in southeastern Brazil

Article Abstract:

Field and laboratory studies are conducted on the shape, construction, composition and mineralogy of the conical siliceous mounds, thought to be stromatolites, found in the Parana basin, near Anhembi, Sao Paulo, in southeastern Brazil. Conclusions reveal that the conical mounds are the result of subaqueous Late Permian vent activity and they differ considerably from other Palaeozoic siliceous hot spring deposits like those at Rhynie, Scotland and the Drummond basin, Australia.

Brazil, Permian period, Mineralogical chemistry

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When streams collide

Article Abstract:

A study on the collision of two river streams, specifically the Ganges and Jamuna rivers in Bangladesh, provides insights into the creation of natural scour holes. Bathymetric surveys conducted in the area reveal the existence of a 30 m deep hole. Scientists believe that the pit was the byproduct of the counter-rotating vortices created by the colliding rivers. This scour hole is considered autocyclic in nature.

Analysis, Geomorphological research, Ganges River, Scour and fill (Geomorphology), Scour (Geomorphology)

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Floods of record

Article Abstract:

Two rivers namely Beni and Mamore rise in the Bolivian Andes and run eastwards into the Amazon basin. Research on these two rivers provides explanations as to how and when they flood.

Bolivia, Rivers, Flood forecasting

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