| Now, two rivers of molten lava poured continually in, making the basin wider. |
| Some areas of this lava formation are highly mineralized, whereas other equally large areas are hard, solid black basalt without any minerals. |
| Thick sequences of basalts form the Morgedal and Gjuve formations and include series of sub-aerial lava flows. |
| None of the sites, some of which included samples from the immediately adjacent country rock pillow lavas, yielded useful data. |
| They may be buried in place by inundation of sediment or even by lavas or pyroclastic flows. |
| Stratovolcanoes are formed of alternating layers of pyroclastic materials and subordinate lavas. |
