image: Kilcoan Sands Member of the Hibernian Greensands Formation overlain by the Cloghfin Sponge Beds Member of the Ulster White Limestone Formation at Portmuck.
Kilcoan Sands Member of the Hibernian Greensands Formation overlain by the Cloghfin Sponge Beds Member of the Ulster White Limestone Formation at Portmuck.
 
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