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== Gourock Sandstone Member [http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=GKA (GKA)], South of the River Clyde, Carboniferous, Midland Valley of Scotland ==

Gourock Sandstone Member is part of the [[Clyde Sandstone Formation]].

=== Name ===
From the town of Gourock on the south side of the Clyde Estuary. Previously known as the Gourock Formation.

=== Lithology ===
The Gourock Sandstone Member comprises white, cross-bedded sandstone with thin beds of red-brown, silty mudstone, and nodules and beds of pedogenic limestone. It is distinguished from other units of the Clyde Sandstone Formation by the presence of thicker beds of sandstone, a lesser proportion of mudstone and less abundant calcareous nodules (Paterson and Hall, 1986<ref name="Paterson86">Paterson, I B, and Hall, I H S. 1986. Lithostratigraphy of the late Devonian and early Carboniferous rocks in the Midland Valley of Scotland.Report of the British Geological Survey,Vol. 8, No. 3</ref>; BGS, 1990<ref name="BGS90">British Geological Survey. 1990. Greenock. Scotland Sheet 30W. Solid. 1:50.000. (Keyworth, Nottingham: British Geological Survey.)</ref>). Paterson et al. (1990)<ref>Paterson, I B, Hall, I H S, and Stephenson, D. 1990. Geology of the Greenock district.Memoir of the British Geological Survey, Sheet 30W part 29E (Scotland)</ref> described the member as comprising thick multistorey bodies of white pebbly sandstone.

=== Stratotype ===
The type area is at (NS 205 761) on 1:50 000 scale Geological Sheet Scotland 29E.

=== Lower and upper boundaries ===
The lower boundary of the member with the underlying Knocknairshill Member (Figure 6, Column 4B) is mapped in the vicinity of Gourock Golf Course (NS 2230 7630). It is recognised by the presence of thick beds of white pebbly sandstone in the overlying Gourock Sandstone Member, but the boundary itself is not exposed.

The upper boundary is not seen but it is presumed to be overlain by sandstone and mudstone strata of the [[Broadlee Glen Sandstone Member]] (Paterson and Hall, 1986)<ref name="Paterson86" />, which distinctively include plant debris and beds of grey mudstone (BGS, 1990)<ref name="BGS90" />.

=== Thickness ===
About 300 m.

=== Distribution and regional correlation ===
The Greenock district south of the River Clyde, and also west of the Largs Fault Zone, Strathclyde.

=== Age ===
Tournaisian.

== References ==
<references/>
[[Category:Carboniferous lithostratigraphical nomenclature]]

Gourock Sandstone Member - Revision history

Dbk: 1 revision imported

Geosource>BobMcIntosh at 21:36, 27 June 2015