GCD-internal            Internal GCD Data
GCD-package             GCD: Global Charcoal Database data
basin_size              Basin size
charcoal_methods        Extraction methods
charcoal_units          Charcoal units
date                    Date table
date_type               Type of dates in date.rda
depo_context            Depositional contexts
lands_desc              Landscape description elements
mat_dated               Material Dated
paleofiredata           GCD Charcoal data
paleofiresites          GCD sites information
pub                     Publication List
site_type               Type of sites
