Structureless sand is fairly unusual in the geologic record. Sandy sediment deposited by flowing water always preserves bedforms....

Pillow-palagonite complexes form when molten lava invades a water body and quenches. Pillows are the quenched blobs of lava. Glassy...

The Old Maid Coulee site, located near Connell, WA, contains convincing evidence of "pre-late Wisconsin" flooding. Geologists distinguish...