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  2. Old Red Sandstone - Wikipedia

    en.wikipedia.org/wiki/Old_Red_Sandstone

    Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. ... As is typical with terrestrial red beds, ...

  3. Red beds - Wikipedia

    en.wikipedia.org/wiki/Red_beds

    Red beds (or redbeds) are sedimentary rocks, typically consisting of sandstone, siltstone, and shale, that are predominantly red in color due to the presence of ferric oxides. Frequently, these red-colored sedimentary strata locally contain thin beds of conglomerate , marl , limestone , or some combination of these sedimentary rocks.

  4. Geology of Loch Lomond and The Trossachs National Park

    en.wikipedia.org/wiki/Geology_of_Loch_Lomond_and...

    This thick sequence of sandstones, siltstones, mudstones and conglomerates is divided into three units; the Lower Old Red Sandstone is represented by rocks assigned to the Arbuthnott-Garvock and Strathmore groups. They are in turn made up of a variety of individual formations characterized by sandstones and to a lesser extent conglomerates and ...

  5. Geology of Brecon Beacons National Park - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Brecon_Beacons...

    The base of the Old Red Sandstone has traditionally been defined at the base of the Tilestones Formation, a thin mica-rich sandstone at the Ludlow – Pridoli boundary. It is overlain by around 700m thickness of mudstones and siltstones with occasional sandstone beds and calcretes known as the Raglan Mudstone Formation.

  6. Senni Beds - Wikipedia

    en.wikipedia.org/wiki/Senni_Beds

    The Senni Beds is the former name of the Senni Formation in Wales. ... "Senni Beds of the Devonian Old Red Sandstone, Dyfed, Wales: anatomy of a semi-arid floodplain

  7. Orcadian Basin - Wikipedia

    en.wikipedia.org/wiki/Orcadian_Basin

    The exact extent of the Orcadian Basin is uncertain due to later tectonic effects and burial beneath younger sediments, but it is known to have reached from the south coast of the Moray Firth to the Shetland Islands in the north and from Strathy on the Caithness coast in the west, to the Outer Moray Firth and East Shetland Platform in the east, where it is proven by hydrocarbon exploration ...

  8. Bloomsburg Formation - Wikipedia

    en.wikipedia.org/wiki/Bloomsburg_Formation

    Early American geologists theorized that these beds correlated with Old Red Sandstone found in Scotland., [2] but the Old Red Sandstone is Devonian in age, or much younger than the Bloomsburg. The Bloomsburg rests conformably above the Clinton Group [4] and Shawangunk Formation, and has a complex upper contact.

  9. Caithness Flagstone Group - Wikipedia

    en.wikipedia.org/wiki/Caithness_Flagstone_Group

    Old Red Sandstone Supergroup: Sub-units ... A notable element is the Sandwick Fish Bed which defines the junction of the two formations and from which a diverse range ...

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