Late Holocene stratigraphy of the Tetimpa archaeological sites, northeast flank of Popocatepetl volcano, central Mexico

Article Abstract:

The eruptive chronology and its coverage of deposition of the Tetimpa archaeological sites near the Popocatepetl volcano in central Mexico has been identified and studied. Data, including carbon dates and measured stratigraphic sections, defines the late Holocene succession in the area. Two of the four recognized volcanic eruptions of Popocatepetl volcano affecting the Tetimpa archaeological sites were confirmed and dated accordingly. Apparently, the two explosions forced settlers to abandon the area.

Mexico, Archaeology and history, Historical archaeology

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Amanz Gressly's role in founding modern stratigraphy

Article Abstract:

Swiss geologist Amanz Gressly's important contributions to stratigraphy are evaluated. These contributions, which are in three areas, include concepts and applications, stratrigraphic correlation, and paleogeographic reconstruction. Gressly established stratigraphic principles that became the basis of modern stratigraphy. Gressly's stratigraphic laws, concepts and principles as stated in his 1838 paper entitled 'Geological Observations of the Soleure Jura' are discussed.

Appreciation, Geology, Stratigraphic, Stratigraphy, Gressly, Amanz

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Dynamic interactions between lahars and stream flow: a case study from Ruapehu volcano, New Zealand - discussion and reply

Article Abstract:

A discussion is presented regarding several hypotheses for the production of a dilute surge observed in New Zealand's Ruapehu volcano. Evidence is explored for a vertically stratified lahar and for a solitary wave originating in the Whangaehu River.

New Zealand, Statistical Data Included, Case studies, Environmental aspects, Volcanism, Lahars, Mudflows

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