The dolerite of Fair Head sends off sheets along the bedding-planes of these carboniferous strata.
Volcanic necks may be recognized at Carrick-a-rede, in the intrusive mass of dolerite at Slemish, at Carnmoney near Belfast, and a few other points.
Probably its original thickness Lough Neagh Tertiary Clays Eocene Basalt and Dolerite Cretaceous Trias, sometimes surmounted by Lower Jurassic Upper Carboniferous Carboniferous was not more than 150 ft., while now only from 40 to loo ft.
Gudea was also a great builder, and the materials for his buildings and statues were brought from all parts of western Asia, cedar wood from the Amanus mountains, quarried stones from Lebanon, copper from northern Arabia, gold and precious stones from the desert between Palestine and Egypt, dolerite from Magan (the Sinaitic peninsula) and timber from Dilmun in the Persian Gulf.
As the rocks lie in a horizontal position, on most of the islands of the group only the basalts or dolerite are visible.
Thus there has been discovered in Babylon a copy of the Behistun (qv.) inscription preserved on a block of dolerite (Weissbach, Babylonische Miscellen.
These are modified forms of basic rocks such as basalt, dolerite and diabase.
Serpentine into talc-schist, dolerite into hornblende-schist) by the same agencies.
They are formed of trachyte, dolerite and basalt.
The basalts are submarine flows which formed the basis of the land upon which grew the vegetation which gave rise to the coals; the effusion of dolerite which covered up the Coal formation was subaerial.