sábado, 10 de enero de 2015

La evolución a través del sílex

El Museo Oiasso de Irun acoge una exposición sobre la vida de los primeros pobladores de la costa vasca

Título: En busca del sílex. Primeros pobladores de la costa vasca.
Lugar: Museo Oiasso de Irun.
Fechas: Hasta el 12 de abril.

La evolución de la especie humana constituye una aventura complejísima, un reto diario de supervivencia y aprendizaje, que se sucede a lo largo de cientos de miles de años. Al tiempo que su anatomía se va transformando; a la vez que se producen los cambios en su aparato locomotor, en la forma de su cráneo o en su dentición, nuestros antepasados se las van ingeniando para fabricar herramientas cada vez más sofisticadas; útiles que les permitan cazar en mejores condiciones, seleccionar las piezas, aumentar las fuentes de provisión de alimentos, curtir pieles o perforar amuletos. [...] diariovasco.com/

Actualización 22-01-15: Oiasso refuerza la exposición sobre el sílex con diversas actividades paralelas 

Rock Art Draws Scientists to Ancient Lakes

Some of the purported “swimmers” in the Cave of the Swimmers, Egypt. Credit: NASA Photo/Chris McKay

Life imitates art. And sometimes science does the same.

Seven thousand year-old rock paintings in the Sahara desert have, somewhat serendipitously, helped uncover evidence of ancient lake beds.

Researchers discovered the mineral remnants of the lake while studying a region well-known for its rock art. The most famous example is the Cave of the Swimmers, which provided a setting in the movie “The English Patient.” The drawings in the cave depict humans that appear to be swimming, floating and diving. And yet this area in southwestern Egypt is one of the driest in the world.

The generally-accepted explanation is that the climate was much wetter in the past, supporting not only the possibility of a swimming hole, but also abundant animal life, such as cows, giraffes and ostriches, which were also drawn or carved into the region’s rocks.

Scientists have previously found support for this local change in climate in ancient lake beds and other geologic data, but most of these lakes pre-date the rock art by many thousands of years. Until now, no one had identified any evidence of a relatively recent, semi-permanent lake that could have served as a swimming hole for the local rock artists.

“Indeed, we found that there were lakes not far from the Cave of the Swimmers,” says Chris McKay from the NASA Ames Research Center. [...] astrobio.net / Link 2