- All data reference a location via the loc_id,
described in database table location.
and splits - All petrographic and geochemical data reference
samples via the sam_id. Geophysical
data and geologic intervals, in contrast, do not reference samples. The
database describes sam_ids in database
table sample. Splits define
specific portions of samples used for petrographic or geochemical analyses,
as described below.
and mineralogic analyses - Petrographic analyses include
standard and photomap-documented analyses.
The database describes split_ids in
database table pa_split for
petrographic splits in table pa_measure.
The database describes individual grain components in database table ma_gr_measure
and individual clasts in database table ma_clast_measure
from petrographic splits with photomap-documented petrographic analyses.
Detailed petrographic analyses are based primarily on these data.
The database describes quantitative and qualitative microprobe analyses
in database table probe_rep.
Quantitative analyses are provided in database table probe_measure;
qualitative analyses are used to ascertain or confirm the identity of
The database describes analyses for bulk mineralogy by X-ray diffraction
analysis (XRD) in database table xrd_split,
with analyses provided in table xrd_measure.
analyses and age dates - The database describes split_ids
in database table ca_split,
with chemical analyses provided in database table ca_measure.
Analyses, which include almost all elements of the periodic table, were
obtained primarily by X-ray fluorescence (XRF) and neutron activation
analysis (NAA). The database describes age dates in database table age_measure
within vertical rock columns (geologic intervals) - The
database defines the stratigraphic assignment for layers within NTS drill
holes in database table strat_int,
the lithology in lith_int,
the alteration in alt_int,
and fractures and lithophysal zones in frac_physae_int.
These definitions, termed geologic intervals, are comprehensive for all
of the Pahute Mesa testing area of the NTS, and for the southern half
of the Yucca Flat area.
(log) data - The database provides individual log analyses
(runs) in database table geophys_int.
Most runs represent unique combinations of drill hole (loc_id)
and log type (log_type_code), but
many multiple runs repeat measurements for a log type that overlap in
depth partially or in entirety with a single drill hole. Almost all logs
were obtained from the eastern half of the Pahute Mesa testing area of
the NTS, and for the southern half of the Yucca Flat area.