Karen Borrazzo

Spatial patterns in Late Holocene lithic projectile point technology of Tierra del Fuego (southern South America): assessing size and shape changes

Abstract This paper focuses on the application of geometric morphometrics to the study of the lithic record in southern South America. We review the regional background, discuss methodological issues and summarize research advances. Here a geometric morphometric approach is applied to the case study of Late Holocene stemmed lithic projectile points from Grande Island of Tierra del Fuego (southernmost South America). Our aim is to assess size and shape changes in a broad spatial scale. Projectile point morphometric variations are used to discuss spatial scales of interaction and differentiation among past human populations across the island. Finally, several hypotheses are introduced to explain the patterns observed.

Concentraciomes de pilas de rocas en la cuenca superior del río Santa Cruz (Argentina)

Este trabajo presenta y caracteriza dos concentraciones de pilas de rocas identificadas en la margen sudoeste de la cuenca superior del rio Santa Cruz (Argentina), en la Estancia Bon Accord. La edad minima de estas estructuras es estimada a partir de analisis liquenometricos. Se recopila informacion sobre la existencia de este tipo de estructuras en la region patagonica. Por ultimo, se discuten algunas de las funciones hipoteticas de estas acumulaciones utilizando casos arqueologicos locales y de otras partes del mundo.

Nuevos Datos de Referencia para la Tasa de Crecimiento de Rhizocarpon Subg. Rhizocarpon en Patagonia

This paper presents the results from lichen size survey of genus Rhizocarpon subgenus Rhizocarpon performed on surfaces exposed during last century in arid Patagonian environments (Santa Cruz, Argentina). We surveyed the cemetery of Puerto Deseado City and rock surfaces exposed by the retreat of Tunel Glacier in Los Glaciares National Park, providing eight new reference sites to estimate the growth rate of these lichens. Growth rate estimations for subgenus Rhizocarpon are between 0,125 to 0,061 mm per year. These values agree with previous estimations for other portions of Patagonian steppe and exhibit significant difference with available estimations for wetter regions in the Patagonian Andes.