SUMMARY Primary current lineation on sandstone bedding planes is a system of parallel but offset ridges and hollows of low relief. It is associated with a parallel preferred dimensional orientation of the sand grains and a grain imbrication. In the Lower Old Red Sandstone, the lineation is one of several structures, including even lamination, which characterise the pat-bedded sandstone facies. Flume experiments suggest the lineation to be a stable equilibrium bed configuration only in the upper flow regime (Froude number 3 0.75). The association of lamination and lineation may have arisen in at least two distinct geographical environments: on beaches in the zone of swash and backwash currents, or on submerged sand bars in channels where the flow is persistently unidirectional (freshwater rivers) or unidirectional for relatively long periods (tidal ebb-flood channels). INTRODUCTION Although often recorded, the sedimentation structure generally known as primary current lineation (STOKES, 1947) has never been fully described and its origin is incompletely understood. This paper describes primary current lineation with particular reference to the Lower Old Red Sandstone (Devonian) of the Anglo-Welsh Basin, in which the structure is widely developed, and also reports the results of laboratory experiments on its origin. SORBY (1859,
Sedimentology – Wiley
Published: Jun 1, 1964
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