Chemical composition of obsidian artifacts

A data set containing data on five elements from 91 obsidian artifacts from the Pojoaque Valley in north central New Mexico. The element presence values (parts per million) were obtained using x-ray fluorescence at Steve Shackley's laboratory in Albuquerque, New Mexico (using a different instrument than the one used to analyze the obsidian source data).

Usage

ObsidianArtifacts

Format

A data frame with 91 rows and 7 variables:

Code

A one-character variable with a code for the Jemez source identified by Shackely using a 2- or 3-dimensional scatterplot

ID

A character variable with an artificial lab ID; the first character is A; the remaining characters are 1:91

Rb

The rubidium value

Sr

The strontium value

Y

The ytterbium value

Zr

The zirconium value

Nb

The niobium value

Source

The data are a random sample (30 from each of the three Jemez sources predicted by Shackely, plus the single sample predicted from another source) from a data set on approximately 450 artifacts provided by the state of New Mexico Office of Archaeological Studies (unpublished).