Iowa Geological Survey109 Trowbridge HallIowa City, IA 52242
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