"Sandstone and trace pebbly (gravelly) sandstone. Stratified bedrock. Occurs onshore. Deposited during the Valanginian Age (Cretaceous Period) (137.7-132.6 Ma BP)."@en . "ARS"@en . . . "Ardingly Sandstone Member"@en . "The upper boundary is conformable or erosional at the junction of the overlying grey to greenish grey mudstones of the Grinstead Clay Member. In places the base of the Grinstead Clay Member is marked by a minor erosion surface on which is developed the informally named Top Lower Tunbridge Wells Pebble Bed (see Allen, 1967). This pebble bed is represented by a \"ripple-drift\" (climbing ripple) bedded fine- to medium-grained sand with small quartz pebbles. Locally the Cuckfield Stone Bed (which cuts out the lower part of the Grinstead Clay Member) rests directly on the Ardingly Sandstone Member. Here the boundary is clearly erosive with massive sandstones of the Ardingly Sandstone Member underlying the \"festoon-bedded\", finely trough-cross-bedded sandstones of the Cuckfield Stone Bed."@en . "Ardingly Sandstone [Obsolete: use ARS]"@en . "The lower boundary is rarely exposed but where seen it is a sharp contact, possibly erosional, between thinly interbedded silty fine-grained sandstones and siltstones of the un-named lower part of the informal lower Tunbridge Wells Sand and the thick cross-bedded sandstones of the Ardingly Sandstone Member. For mapping purposes the boundary is placed either at the top of the highest discernible thinly-bedded siltstones and sandstones, or at the base of the prominent \"crags\" characteristic of the Ardingly Sandstone Member outcrop."@en . . "132.6"^^ . "137.7"^^ . . "Maximum 25 to 33m but ranges down to 12.2m at Cuckfield and 18 to 24m around Haywards Heath."@en . "Fine- and medium-grained quartzose cross-bedded sandstone, largely thickly bedded or massive. Commonly referred to as \"sandrock\" meaning a clean white or greyish white soft quartzose sandstone. The member is believed to become finer-grained towards the south, away from the Horsham-Ardingly type area. The member shows a tendency to \"coarsen-upwards\" and commonly contains \"stringers\" of quartz and quartzite pebbles. Natural crags show a cyclic succession from almost parallel bedded units up into shallow trough cross bedded sandstones and capped by massive units with thin units of contorted bedding."@en . . . . . "stable"@en . "Ardingly Sandstone Member"@en . .