ANALISIS PALINOLOGICO DEL HOLOCENO TARDIO DEL SITIO "FORTIN NECOCHEA" (PARTIDO DE GRAL. LAMADRID, PROVINCIA DE BUENOS AIRES, ARGENTINA)

Maria A. Nieto, Aldo R. Prieto

Abstract


Pollen analysis showed two types of structures: 1. Originated by analysis of similaritie between models (Q) which allowed to subdivide the profile into three polIen zones (A, B and C). These zones coincide with kown stratigrafic and archaeologic units at the site and 2. originated by interaction of variabls through time (R) which showed three clusters: (I) Ranunculaceae, Plantago and Gramineae which would indicate lower edaphic hurnidity conditions; (lI) Compositae, Umbelliferae, Chenopodiineae, Cyperaceae and Leguminosae which can coexist in flooded places (bogs and or smalI basins); (III) Cruciferae, greatly adapted to different environments, which joins to clusters I and Il at a relatively low similarity level (25%). From these results we postulate a structural model of the ecosystem associated to a pond environment characteristic of Buenos Aires Province from 3.630 + 60 years BP up the present.

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