The surface soil is clay in which are embedded fragments of siliceous sandstone, used for millstones and constructional purposes; the subsoil is limestone.
The springs are principally alkaline, alkaline and siliceous, acidic, or acidic and hepatic (sulphurous).
His maps on the distribution of carbonates, siliceous deposits and manganese nodules form the basis of understanding oceanic sedimentology.
siliceous scree in the northwest Scottish Highlands.
mineral salts, especially calcium carbonate, often rich in acidic humous compounds, and characterized by oak and birch woods, siliceous pasture, and heaths with much acidic humus in the sandy soil.