Current · Cross section

Herringbone cross-stratification

Stacked cross-bed sets that dip in opposite directions, resembling a fish skeleton.

Schematic, not to scale

How it forms: Currents that reverse direction, building cross-beds that dip one way, then the other.
Typical setting: Tidal flats and tidal channels (uncommon, since it needs roughly equal currents both ways)
Way up: Same as cross-bedding.
Flow direction: Shows two opposite flow directions.

Photo examples