eruptive rock

It is not uncommon in massive eruptive rocks.

They are intrusive in the Paleozoic strata but older than the Tertiary eruptive rocks.

He described in 1878 the eruptive rocks of the district of Saar and Moselle.

In the south it is defined by a group of epizonal intrusions and a few erosional remnants of eruptive rock.

Where it is covered by a sheet of eruptive rock (charrah), it is protected from erosion.

Recent eruptive rocks, mainly basalts, form a line of hills almost bare of vegetation between Benguella and Mossamedes.

In 1820 he issued his Essai géologique sur l'Ecosse, in which the eruptive rocks in particular were carefully described.

With the notable exception of King Island, all the intrusive and eruptive rocks are calc-alkaline, mainly granodioritic bodies and dacite ejecta.

It was necessary to walk through the midst of eruptive rocks, some of which, shaken in their balance, went rolling down with thundering clamor to the bottom of the abyss.

On a broader scale, the intrusive and eruptive rocks are part of the Coast Plutonic Complex, which is the single largest contiguous granite outcropping in North America.

Our route lay amidst eruptive rocks, some of which, shaken out of their loosened beds, rushed bounding down the abyss, and in their fall awoke echoes remarkable for their loud and well-defined sharpness.

I spent that whole night in one constant nightmare; in the heart of a volcano, and from the deepest depths of the earth I saw myself tossed up amongst the interplanetary spaces under the form of an eruptive rock.

For on my part, I do not believe it possible that the Great Eyrie can be a volcano; the Alleghanies are nowhere of volcanic origins I, myself, in our immediate district, have never found any geological traces of scoria, or lava, or any eruptive rock whatever.

He studied the geysers of Iceland, and wrote also on the classification of some of the eruptive rocks; but his main work consisted in the systematic examination of the crystals of numerous minerals, in researches on their optical properties and on the subject of light polarization.

He published observations on geology and mineralogy in Spain and Italy as well as in central and northern Europe: he wrote on gypsum, pyrites, felspar, tachylite, cordierite and on some eruptive rocks, and devoted much attention to the crystals developed during metallurgical processes.

He was a man of wide knowledge and extensive research, and wrote memoirs on chemical and mineralogical subjects, on eruptive rocks, on the structure of the Jura, the metamorphism of the Western Alps, on the formation of oolitic limestones, on kaolinization and on metalliferous veins.