Gallery of Sedimentary Structures

Bedforms and Cross-Stratification Produced by Waves and Tides

Images copyright © 1998, John W.F. Waldron, except where otherwise stated
symmetric cross-laminations Symmetric wave-ripple lamination, Horton Group, Tennecape
wave ripple cross-laminations Wave-ripple cross-lamination. These wave-ripple cross-laminations are less clearly symmetric. Each ripple migrated producing unidirectional cross-lamination. However the individual ripple cross-sections are symmetric, characteristic of wave action.
interference ripples Interference ripple sets, Silurian Clam Bank Formation, Port au Port Peninsula, Nfld
ladder ripples Ladder ripples. This term applies to small ripple trains within the troughs of larger ripples, as seen here at Brule, NS. This configuration can be produced by waves or currents, typically under ebb tide conditions where water is draining from sand flats
herringbone cross-bedding Herringbone cross-bedding. Tabular cross-beds produced by alternating flow directions can show this 'herringbone' configuration. Horton Group, Tennycape, NS.
HCS HCS: Storm waves produce this non-directional form of cross-bedding, known as hummocky cross-stratification or HCS. The scale is a metre stick about 3 cm wide. Arisaig NS.
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