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
Stratotypes:
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. 
Reference(s):
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S014