COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED?
1 AREA 4 12 F 3 -
5 PERIMETER 4 12 F 3 -
9 SED_BASINS# 4 5 B - -
13 SED_BASINS-ID 4 5 B - -
17 MAP_UNIT 30 30 C - -
47 EON 6 6 C - -
53 AGE/PERIOD 30 30 C - -
83 THICKNESS(KM) 4 4 N 1 -
The item 'MAP_UNIT' can have the following 6 possible descriptive values:
sedimentary basin; older sedimentary basin; flysch basin, fold belt; flysch basin, deformed;
flysch basin, metamorphosed; or volcanic rocks. Areas of Alaska without polygons are those
areas underlain by older, basement, granitic, metamorphic or volcanic rocks
unrelated to sedimentary basins.
The item 'EON' can have the following 4 possible values: Cz (Cenozoic); Mz (Mesozoic);
Mz-Cz (Mesozoic to Cenozoic); or Pz-Cz (Paleozoic to Cenozoic).
The item 'AGE/PERIOD' can have the following 3 possible values: Late Tertiary
and Quaternary; Lower Tertiary; Jurassic to Cretaceous; or no value (no period specified).
The item 'THICKNESS(KM)' can have the following 8 possible values: 0.1, 1.1, 3.1, 5.1,
7.1, 9.1, 11.1, or 13.1.
These values are derived from isopachs of basin fill and/or the thicknesses interpreted
from Bouger gravity lows, within given map units.
Since a given map unit or basin contains varying thicknesses of fill, the user must query
appropriately to find the range of interest. For example, to find areas with a fill
thickness between 3 and 5 kilometers, select "thickness(km) > 3 and thickness(km) < 5".