Home
Organization & Staff
Popular Subjects
Related Links
General Geology
Geologic Programs
Mineral Resources
Geophysics
Geologic Hazards
Oil and Gas Regulation
Groundwater Resources
Water Resources Mngmt
Source Water
Water Monitoring
Volunteer Monitoring
Educational Materials
GEOSAM
Iowa STORET / WQX
Mapping (GIS Interactive)
NRGIS Library
Publications
Topographic Maps
Iowa Geological& Water Survey 109 Trowbridge HallIowa City, IA 52242Phone (319) 335-1575Fax (319) 335-2754WebmasterBob Rowden
PHOTOMICROGRAPH
Phanerozoic-Clast Breccia
Water Well Cuttings Sample
Cretaceous Shale Clast with Foraminifera
The brown matrix of the grain is ferruginous shale and the white inclusions are forams.
field 1.3 - 0.84 mm plane-polarized light