The BGS Lexicon of Named Rock Units — Result Details

Kilcoan Sands Formation

Computer Code: KOS Preferred Map Code: notEntered
Status Code: Full
Age range: Coniacian Age (KO) — Santonian Age (KS)
Lithological Description: Pale green glauconitic sands thought largely to be derived from the Collinwell Sands Formation. Three conspicuous Inoceramus bands divide the succession into three unequal parts.
Definition of Lower Boundary: The lower boundary is disconformable at an erosion surface above the mid-Hibernian Greensands 'unconformity'. Rests on each of the older formations in the group (Collinwell Sands, Island Magee Siltstones and Belfast Marls formations) and overlaps onto pre-Cretaceous strata over the most positive structural highs.
Definition of Upper Boundary: The upper boundary is disconformable at an erosion surface beneath various younger members of the Ulster White Limestone Group.
Thickness: Up to 7.3m at Kilcoan.
Geographical Limits: Fully developed in the Island Magee area and within the East Antrim Basin and Southern Uplands area of Northern Ireland. Elsewhere in NI the formation may be represented in the condensed successions of the undivided Hibernian Greensands Group.
Parent Unit: Hibernian Greensands Group (HBG)
Previous Name(s): Chloritic Sands And Sandstones (-1005)
Upper Hibernian Greensands (-2272)
Senonian Greensands (-4736)
Kilcoan Sands Member (-4135)
Senonian Greensand [Obsolete Name And Code: Use KOS] (SNG)
Upper Glauconitic Beds (-2878)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  The old cutting to the old Kilcoan Quarry, west Island Magee. Basal conglomerate with overlying coarse loosely cemented glauconitic quartz sand with common brachiopods and bivalves. 
Reference(s):
Hume, W F. 1897. The Cretaceous strata of County Antrim. Quarterly Journal of the Geological Society of London, Vol.53, 540-606. 
Manning, P I, Robbie, J H and Wilson, H E. 1970. Geology of Belfast and the Lagan Valley. Memoir of the Geological Survey of Northern Ireland, Sheet 36 (Northern Ireland). 
Griffith, A E and Wilson, H E. 1982. Geology of the country around Carrickfergus and Bangor. Memoir of the Geological Survey of Northern Ireland. Sheet 29 (Northern Ireland). 
Reid, R E H. 1971. The Cretaceous rocks of north-eastern Ireland. Irish Naturalists' Journal, Vol.17, 105-129. 
Tate, R. 1865. On the correlation of the Cretaceous formations of north-east Ireland. Quarterly Journal of the Geological Society of London, Vol. 21, 15-44. 
Hancock, J M. 1961. The Cretaceous System in Northern Ireland. Quarterly Journal of the Geological Society of London, Vol. 117, 11-36. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable