Status and correlation of Andean ammonite biozones are reviewed. Available calpionellid, nannofossil, and radiolarian data, as well as radioisotopic ages, are also considered, especially when directly related to ammonite ...

A novel strategy for accomplishing zone trapping in flow analysis is proposed. The sample and the reagent solutions are simultaneously inserted into convergent carrier streams and the established zones merge together before ...

The quality of the continental waters is applied in the biogeochemicals, the characteristics of the hydrographic basin, the use and the soil occupation. The qualitative degradation of this resource is caused by pollutants ...