Obsidian hydration dating on the south coast of peru

Cahuachi, an important Nasca ceremonial center, was built and became a focus of feasting and ceremonial activities.

The Middle Nasca period saw many changes, perhaps brought about by a long drought.

This sample is ground down to about 30 micrometers thick and mounted on a petrographic slide.

The hydration rind is then measured under a high-power microscope outfitted with some method for measuring distance, typically in tenths of micrometers.

The Nazca lines were first intensively studied by the German mathemetician Maria Reiche and have been the focus of many silly theories concerning alien landing places.

Recent investigations at Nasca include the Project Nasca/Palpa, a photogrammetric study from the Deutschen Archäologischen Instituts and Instituto Andino de Estudios Arqueológicos, using modern GIS methods to record the geoglyphs digitally.​ Vaughn, Kevin J., Christina A.

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When an unworked nodule of obsidian is initially fractured, there is typically less than 1% water present.

The Nasca are known for their elaborate textile and ceramic art, including an elaborate mortuary ritual associated with warfare and the taking of trophy heads.

More than 150 trophy heads have been identified at Nazca sites, and there are examples of burials of headless bodies, and burials of grave goods without human remains.

Over time, water slowly diffuses into the artifact forming a narrow "band," "rim," or "rind" that can be seen and measured with many different techniques such as a high-power microscope with 40-80 power magnification b) depth profiling with SIMS (secondary ion mass spectrometry), and IR-PAS (infra red photoacoustic spectroscopy).

In order to use obsidian hydration for absolute dating, the conditions that the sample has been exposed to and its origin must be understood or compared to samples of a known age (e.g.

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