Sections normal to flow may be horizontal defining planar cross lamination 2 d ripples or may be trough shaped defining trough cross lamination 3 d ripples.
Wave ripple cross lamination.
Unidirectional cross laminae sometimes with drapes sand laminae oriented in the opposite direction.
Medium cross lamination are ripples with a height greater than ten centimeters and less than one meter in thickness.
Current and wave cross lamination figure pageindex 21.
Wind ripples commonly have coarser grains on their crests and this is reflected within wind ripple laminae which show inverse grading coarsening upward slightly within laminae.
Ancient wave ripple lamination and hummocky cross stratification.
These wave ripple cross laminations are less clearly symmetric.
Ancient ripple lamination figure pageindex 22.
Grain avalanches down lee slopes result in small scale cross lamination.
Wave ripple cross lamination formed in a sandy lacustrine shoreface in the canadian great lakes is characterized by i small randomly superimposed sets of angle of repose cross lamination with strongly bimodal dips.
Ripples formed by a combination of wave action and unidirectional flow.
The ripples form lateral to one another such that the crests of vertically succeeding laminae are out of phase and appear to be advancing upslope.
Each ripple migrated producing unidirectional cross lamination.
Wind ripple lamination generally comprises thin 1 10 mm parallel laminae defined by slight changes in grain size.
Wave ripple cross lamination is characterized by a variety of distinctive features including.
Some ripples that may fit this category would be current formed sand waves and storm generated hummocky cross stratification.
Ripple cross laminae forms when deposition takes place during migration of current or wave ripples.
Lensoid and complexly interwoven cross sets.
A series of cross laminae are produced by superimposing migrating ripples.
Ii small superimposed sets of angle of repose cross lamination where the thickest and most prevalent sets have onshore dips and the thinner subsidiary sets dip offshore.
