However, it has developed an internal wide flood-tidal delta where around the flood ramp flood-oriented megaripple
fields (medium 3D dunes) are developed, as well as numerous superimposed linguoid, lunate and straight ripples (Table 2; Fig.
The symmetrical profile and chemically mature nature of the megaripple sand requires a well-agitated setting, suggesting the influence of combined wave and tidal action.
This paper describes this unique megaripple sequence and explores possible modes of origin of these sedimentary structures in the shallow waters of the Cambrian Sauk Sea.
Bedding and megaripple orientation data were measured using a Brunton transit compass.
The exposed megaripple surface is dominated by medium- to coarse-grained quartz sandstone.
The morphological dynamics of intertidal megaripples
in the Mawddach Estuary, North Wales, and the implications for palaeoflow reconstructions.
Esta facies se interpreta como el resultado de la migracion y sedimentacion de trenes de dunas o megaripples
de cresta sinuosa mas o menos perpendicular a la direccion del flujo, en corrientes de bajo regimen de flujo (Allen, et al.
The sand does not appear as a continuous sheet but is formed into alternating patterns of light and dark tone indicating that the sand is formed as bedforms, mostly megaripples.
The sand in the region of the reefs is not a continuous sheet and can be described as a zone of starved megaripples (Amos and King 1984).
The megaripples in coarse sand associated with the mussel reefs are normally formed under flow conditions up to 60 cm [s.
Over this intertidal flat linguoid and straight crested megaripples
, sand waves and beach ridges migrate under high energy wave conditions.
In some outcrops cross-bedding can be related to megaripples
up to one metre high (Fig.