There are two sets of lamprophyre dykes. Biotite is an essential phenocryst in some varieties of lamprophyre. There are minor intrusions of lamprophyre. Cape Portland is host to andesite, lamprophyre and porphyrite intrusions and eruptions from . There are also small intrusions of lamprophyre. The dykes included a swarm of dolerite dykes, also lamprophyre, feldspar porphyry and aplite. The stock is intruded by dikes composed of biotite lamprophyre on its outer margins. Igneous intrusions of dolerite, felsite, lamprophyre and diorite of Palaeozoic age are encountered in places. Other rock types present include&colon; alkali basalt, nephelinite, lamprophyre, and carbonatite. On King Island, there was an intrusion of a biotite lamprophyre dyke at . The dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite. The Karkonosze Granite is intruded by somewhat younger lamprophyre dykes. The climbing cliffs feature subtypes of that rock like ferrodiorite and lamprophyre. A hornblende lamprophyre dyke in the Rozel Conglomerate is dated at . There is also a minor intrusion of lamprophyre in this area.