1915  Smyth: On the Faunal Zones of the Rush-Skerries
           Carboniferous Section, Co. Dublin.
     1951  Smyth: 289 - 11o ft., highest beds of Rush Slates,
           immediately below the Rush Conglomerate Series, 70
           yrds. at 63° from the Martello tower soth-east of Rush
           Harbour.