Current and wave cross lamination figure pageindex 21.
Wave ripple cross lamination.
Some ripples that may fit this category would be current formed sand waves and storm generated hummocky cross stratification.
Ripples formed by a combination of wave action and unidirectional flow.
Interference ripple sets silurian clam bank formation port au port peninsula nfld.
Ancient wave ripple lamination and hummocky cross stratification.
Medium cross lamination are ripples with a height greater than ten centimeters and less than one meter in thickness.
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.
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.
Wave ripple cross lamination the form of cross lamination see cross stratification produced by the migration of wave generated ripples or combined flow ripples i e.
Lensoid and complexly interwoven cross sets.
Ripple cross laminae forms when deposition takes place during migration of current or wave ripples.
However the individual ripple cross sections are symmetric characteristic of wave action.
Wave ripple cross lamination is characterized by a variety of distinctive features including.
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.
Wind ripple lamination generally comprises thin 1 10 mm parallel laminae defined by slight changes in grain size.
Grain avalanches down lee slopes result in small scale cross lamination.
Ancient ripple lamination figure pageindex 22.
These wave ripple cross laminations are less clearly symmetric.
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.
Each ripple migrated producing unidirectional cross lamination.
