Trough Cross Stratification (TCS)

Trough cross stratification (TCS) forms from the passage of aggrading asymmetric ripples.  TCS is formed by the downstream movement of 3-dimensional asymmetric ripples.   Thus, the stratification is characterized by laminae that fill in elongate scours. The laminae, therefore, are curved and tangential to the base of the cross-set. 

	Single trough cross-stratified bed (with pencil through center), showing tangential relations between foreset laminae and top and bottom of bed.  Note that the foreset laminae are curved.  Foreset laminae are dipping toward the right, suggesting paleoflow in that direction.
	Closer view of above image.  Note tangential relational between curved foreset laminae and bottom of set.
	Amalgamated TCS, Wood Canyon Fm, eastern California.  Temp photo, need to add highlite lines.