The BGS Lexicon of Named Rock Units — Result Details

Isle Port Conglomerate Member

Computer Code: ISP Preferred Map Code: ISP
Status Code: Full
Age range: Ludlow Epoch (SU) — Early Devonian Epoch (DL)
Lithological Description: A greyish, clast-supported, pebble conglomerate with mainly fine-grained greywacke sandstone pebbles and cobbles but also clasts of chert, siltstone, granular sandstone, limestone and granite and with thin intercalations and lenses of greyish medium- and coarse-grained sandstone.
Definition of Lower Boundary: Pebble conglomerates of at least 1m thickness sharply overlying red-brown fine- and medium-grained sandstone, towards the top of the Swanshaw Sandstone Formation.
Definition of Upper Boundary: Pebble conglomerates are conformably succeeded by greyish medium- and fine-grained sandstones, towards the top of the Swanshaw Sandstone Formation.
Thickness: About 30m
Geographical Limits: South Ayrshire, Scotland.
Parent Unit: Swanshaw Sandstone Formation (SWAS)
Previous Name(s): Part Of The 'Sedimentary Group' Of The Lower Old Red Sandstone (-1617)
Alternative Name(s): none recorded or not applicable
Partial Type Section  The basal part of the member is exposed in the tributary to Craigencroy Glen.The top is exposed in cliffs north east of Fairy's Well. 
Smith, R A. 1999. Geology of the Croy area. Explanation of 1:10,000 Sheet NS 21 SE/SW. British Geological Survey Technical Report WA/00/13. 
Smith, J. 1895. From the Doon to the Girvan Water, along the Carrick Shore. Transactions of the Geological Society of Glasgow, Vol. 10, p. 1 - 12. 
Eyles, V A, Simpson, J B and Macgregor, M C. 1949. Geology of Central Ayrshire. Memoir of the Geological Survey of Scotland, British Geological Survey, Sheet 14 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: