Calp

Notes:

A dark mud-bearing limestone with thick beds containing internal thin flat or convoluted laminations. It was probably deposited in deep water marine settings from sediment that was carried from shallow water down-slope by turbidity currents. Calp contains between 25 and 30 weight % of insolubles, mainly clay (Marchant and Sevastopulo 1980, p. 202) and sometimes a small volume of the iron sulphide mineral Pyrite or "Fool's Gold"which may form small cubic crystals. Generally poorly fossiliferous it contains some brachiopods, bryozoans, sponge spicules and foraminifera. Often small thin white veins of quartz or calcite cross-cut the foliated fabric of the stone. The term "Calp"was coined by the celebrated Galway chemist and mineralogist Richard Kirwan. Although the type locality is in Dublin, Calp is widely distributed in Ireland.