Results 91 to 100 of about 313 (146)

From the Cover: A Howiesons Poort tradition of engraving ostrich eggshell containers dated to 60,000 years ago at Diepkloof Rock Shelter, South Africa. [PDF]

open access: yesProc Natl Acad Sci U S A, 2010
Texier PJ   +11 more
europepmc   +1 more source

Contribución al conocimiento petrológico y geoquímico de silcretas formadas por silicificación (Mioceno, Cuenca del Tajo)

open access: yes, 1987
Las rocas silíceas miocenas de la Cuenca del Tajo (sílex y ópalos) han sido llamadas silcretas. En el presente trabajo se discute la aplicación a estas rocas del término silcreta debido a la dificultad de definir, basándose en datos petrológicos, si ...
Bustillo Revuelta, Manuel   +1 more
core  

Geomicrobiology of the concretions of the Makgadikgadi pans (Botswana): An astrobiological perspective

open access: yes
The Makgadikgadi Basin of central Botswana hosts one of the largest salt lakes (pans) system on Earth. These pans are characterized by strong evaporation rate, high salinity and pH and high UV radiation.
Fulvio Franchi   +2 more
core  

Fossil evidence of Archaean life. [PDF]

open access: yesPhilos Trans R Soc Lond B Biol Sci, 2006
Schopf JW.
europepmc   +1 more source

Origins of the southeastern Australian vegetation. [PDF]

open access: yesPhilos Trans R Soc Lond B Biol Sci, 2004
Hill RS.
europepmc   +1 more source

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