Limehill Farm ASSI consists of the channel and banks of a minor stream flowing through agricultural grassland. The banks and bed of the stream contain small scale exposures of fossiliferous mudstones.
It is the type locality for the zonal graptolite Monograptus sedgwickii. The site has yielded the world's oldest known Nowakiid, Nowakia brevis, for which this is also the type locality.
It is one of only two localities in Northern Ireland exhibiting a shelly fauna in a Silurian graptolitic setting.
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