Plate 89

Flute cast morphology

Flute casts are aligned in rows parallel to the flow in these examples deriving from two different turbiditic formations of the Appenines. Blunt-nosed cylindrical forms are associated with more pointed and conical forms. Some scours are deeper than others and show "twisted" parts probably reflecting the action of helicoidal vortexes.

The two outcrops are typical of tectonically deformed zones in fold-thrust belts, with the sandstone beds standing out amid more erodible mudstones.

A: Marnoso-Arenacea Formation, Miocene, Umbria region; B: Monte Sporno Formation, Paleocene Bagamza Valley, northern Apennines.