The islands themselves are crossed by many calcareous faults, some marbleized, and made of basaltic rock, ash, and other volcanic materials.
32.
As mentioned previously the hard basaltic rock encountered caused great problems for the engineers and " navvies " on the line.
33.
The Nemaha Range lies roughly east of the Midcontinent rift, which forms a layer of basaltic rock around 1.1 billion years old.
34.
Finally, the reservoirs were excavated by creating holes in the basaltic rock, starting from the bottom of the cavities and going up.
35.
The promontory is formed from hard basaltic rock ( see also Geology of Cornwall ) and projects north into the Atlantic Ocean.
36.
Basaltic rocks weather substantially faster than granitic rocks, which would quickly remove CO 2 from the atmosphere to lower levels than pre-volcanic activity.
37.
The regolith in the maria is rich in iron and magnesium and is silica-poor, as are the basaltic rocks from which it is formed.
38.
In the north, from Cape Runaway to Tokata, are allochthonous basaltic rocks, believed to represent sea floor, that has been obducted onto the land.
39.
Yet other ideas are that they are unprocessed materials which never melted or that they are mixtures of carbonaceous chondrite and basaltic rock melts.
40.
The soils consist of finely broken up basaltic rock fragments and are highly enriched in sulphur and chlorine, probably derived from volcanic gas emissions.
