With the exception of the coral and a small amount of calcareous sandstone, the rocks are entirely volcanic and range from basalt to trachyte, but are mainly basalt.
In most cases the eruptions appear to be of Pliocene or later date, but in the extreme north some of the basalt seems to belong to the Miocene period.
Two systems. At the close of the Cretaceous period great eruptions of basalt and basaltic tuff took place, especially in the Lisbon area.
Figure 9, Plate I., shows the top of the De Beers' crater with basalt overlying the shale.
These rocks form a prominent feature underneath the basalt terraces of the east side of Skye, Raasay and Eigg.
The hamlet of Aremberg is at the foot of a basalt hill 2067 ft.
In both occurrences, however, there is still the possibility that the eclogite or the basalt is not the original matrix, but may have caught up the already formed diamond from some other matrix.
Jebel Hauran, east of the Jordan, is capped by a great sheet of basalt; and many other basalt flows are found, especially in the country north of Lebanon.
Besides huge masses of old schists and sandstones, the range contains extensive limestone, marble, diorite, basalt and porphyry formations, while granite prevails on its southern slopes.
Inscribed basalt bowl found at Babylon) and fragments of ware painted with dark ornament on light body-clay, or in polychrome on a cream-white slip, or black burnished, found on N.