“…These are commonly referred to as ‘lateral migration’ and ‘vertical accretion’ types, given their interpreted association with bedform dynamics (Rubin & Hunter, ; Clemmensen, ; Scherer, ). Examples from the former category are broadly characterized by unimodal spread of cross‐stratification dip‐azimuths, oblique to the dip‐azimuths of the internal bounding surfaces (Clemmensen, ; Ahmed Benan & Kocurek, ; Scherer, ; Rodríguez‐López et al ., ; Besly et al ., ), and are consistent with lateral migration‐dominated models proposed by Rubin & Hunter (). Other ancient examples fall within the latter category and are characterized by a bimodal (not bipolar) distribution of cross‐stratification dip‐azimuths (Glennie, ; Steele, ; Clemmensen, ; Bose et al ., ) and are consistent with longitudinal behaviour dominated models (well explained in Rubin & Hunter, ).…”