Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Lamprophyre and peridotite intrusions

Online link
Description This cover includes locations of alkaline ultramafic igneous rocks. The igneous rocks are evidence for Permian extensional reactivation of the faults of continental rifts in the map area. The igneous rocks are Permian lamprophyres and mica peridotites.
Originators Rhea, Susan
Publication U.S. Geological Survey Open-File Report 97-0681

Related topics

States or counties


pt locations of small dikes or peridotite locations

Label Definition
NAME geol quad name and location relative to other similiar features


arc attributes, includes name of geol quad

Label Definition
NAME geol quad and location of feature relative to others on map
SYMBOL symbol number used in plotting map C
DSYMBOL symbol number used in plotting map D