Icebergs, action on cleavage.
Illapel, section near.
Imperial, beds of shells near.
Incrustations, saline.
Infusoria in Pampean formation. —in Patagonian formation.
Iodine, salts of.
Iquique, elevation of. —saliferous deposits of. —cretaceo-oolitic formation of.
Iron, oxide of, in lavas. —in sedimentary beds. —tendency in, to produce hollow concretions. —sulphate of.
Isabelle, M., on volcanic rocks of Banda Oriental.
Joints in clay-slate.