GLO001
contact (approximate)
Trace of boundary between geologic units. Approximately located: horizontal positional accuracy generally within 2 mm at 1:24,000 scale, or 48 m on the ground.
DAS2
GLO002
fault, graben (certain)
Trace of geologic normal fault, forming a depression on the downthrown side known as a graben. Well-located: horizontal positional accuracy better than 0.5 mm at 1:24,000 scale, or 12 m on the ground.
GLO003
investigation boundary
Edge of the area investigated by this study.
DAS1
GLO004
map boundary
Edge of the area displayed on the map.
GLO005
annotation tie
Polyline linking a vector feature to its label.
GLO006
fissure, vent (certain)
Trace of linear opening where lava exited the ground. Well-located: horizontal positional accuracy better than 0.5 mm at 1:24,000 scale, or 12 m on the ground.
GLO007
radiocarbon
Age determined by laboratory analysis of radiocarbon quantity in the sample.
GLO008
charcoal
Carbonized organic matter, thought to have been burned by the overlying lava flow at the time of emplacement.
GLO009
eruption/episode start year
Calendar year of the beginning of the eruption or, if available, the eruptive episode that formed this unit. If no end year is given, this is also the calendar year of the end of the eruption or eruptive episode that formed this unit. Times New Roman, bo
GLO010
age group
Unit age categories, 9. being the youngest and 5. being the oldest, after Wolfe and Morris (1996). Numbers smaller than 5. refer to age groups recognized elsewhere on the Island of Hawai‘i, but not represented on this part of Kīlauea volcano. Times Ne
GLO011
petrographic classification of tholeiitic basalt
Rocks have been placed in one of seven categories, a. through g., based on respective abundances of olivine and plagioclase phenocrysts; most rocks have less than 1 percent pyroxene phenocrysts. The assignments were made in the field and represent megasc
GLO012
geologic event identifier
Foreign key to GeologicEvents table, identifying the geologic event that produced the map unit. No specific formatting.
GLO013
event name
Descriptive name of the geologic event. No specific formatting.
GLO014
circa
Exact calendar year not certain, but event likely took place around the time of the specified calendar year.
GLO015
certain
Little or no ambiguity.
GLO016
mafic-composition air-fall tephra
Fragments of volcanic rock and lava, of various sizes, are known as "tephra." This material is carried into the air by explosions and by hot gases in eruption columns or lava fountains. As tephra falls to the ground with increasing distance from a volcan
DAS4
GLO017
mafic-composition lava flows
A lateral, surficial outpouring of molten lava from a vent or a fissure, and the solidified body of rock that forms when it cools. Composed of fine-grained, dark-colored rocks, and tends to form extensive sheets with generally low relief. Includes basalt
GLO018
tholeiitic basalt
Tholeiitic basalt is defined here to contain 2 pyroxene phases and interstitial quartz or tridymite or cristobalite in the groundmass. Pyroxene (augite and orthopyroxene or pigeonite) and calcium-rich plagioclase are common phenocryst minerals. Olivine m
DAS5
GLO019
only part
Entire described unit consists of a single part or constituent.
DAS6
GLO020
all
Component constitutes effectively 100 percent of the volume of the described entity.
DAS7
GLO021
eruption
The ejection of volcanic materials (lava, pyroclasts, and volcanic gases) onto the Earth's surface, either from a central vent or from a fissure or group of fissures.
DAS8
GLO022
std
Standard scientific confidence.
GLO023
years
Age expressed in number of times the Earth has revolved around the Sun.
GLO024
Heading1st
Times New Roman, bold, 12 point, upper case, centered.
GLO025
Heading2nd
Times New Roman, 12 point, upper case (except in parenthesis, sentence case), centered.
GLO026
DMU1
Times New Roman, bold before em dash, 12 point, sentence case, 8 point space before lines besides first line, left aligned.