Drumharvey
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Geology & landscape
Geological Period: Devonian
Description
Drumharvey Devonian stratigraphy The rocks exposed at Drurnharvey belong to the Shanrnullagh Formation for which this site is the type locality. Evidence from other exposures of the Shanrnullagh Formation shows that the rocks are of Upper Devonian age, dating from some 370 million years ago. The rocks here are purple-brown, fine to medium-grained sandstones. The available evidence indicates that these rocks were formed on a low lying inland plain experiencing desert conditions but subject to periods of temporary flooding. Sand and silt material was deposited occasionally during these floods. The frequent presence of ripple marks in sandstones, with desiccation cracks in succeeding thin mudstones, indicates the intermittent nature of extensive flooding with high evaporation leading to a complete drying out of temporary lakes and other water bodies. https://www.daera-ni.gov.uk/publications/drumharvey-assi