Structural Features in Illinois: Point Locations of Impact Features, Explosion Features, Silurian Reefs, and Buried Precambrian Hills
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资源简介：
These data are for use at a scale of 1:500,000 or smaller only. They are
appropriate for use in regional thematic analysis, for display purposes, and
for mapping environmental phenomena related to them.
This is a partial representation of Plate 1 from ISGS Bulletin 100 (1993).
Features depicted are limited to well documented, significant ` impact
features, explosion features, Silurian reefs, and buried Precambrian hills in
Illinois. Names of the features are indicated. This data set must be used in
conjunction with the companion data sets STRUCTFAULTS, STRUCTCLINES and
STRUCTPOLY for a full representation of Plate 1 of ISGS Bulletin 100.
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SCIOPS
