Wave Ripple 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.

Wave ripple cross lamination.

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. A series of cross laminae are produced by superimposing migrating ripples. Some ripples that may fit this category would be current formed sand waves and storm generated hummocky cross stratification. Ancient wave ripple lamination and hummocky cross stratification.

Interference ripple sets silurian clam bank formation port au port peninsula nfld. Each ripple migrated producing unidirectional cross lamination. Current and wave cross lamination figure pageindex 21. Lensoid and complexly interwoven cross sets.

Wind ripple lamination generally comprises thin 1 10 mm parallel laminae defined by slight changes in grain size. 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. Ripples formed by a combination of wave action and unidirectional flow. Unidirectional cross laminae sometimes with drapes sand laminae oriented in the opposite direction.

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. Wave ripple cross lamination is characterized by a variety of distinctive features including. Grain avalanches down lee slopes result in small scale cross lamination. 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.

However the individual ripple cross sections are symmetric characteristic of wave action. These wave ripple cross laminations are less clearly symmetric. Ancient ripple lamination figure pageindex 22.