11. Lakes formed in these basins, including those in the southern part of the High Lava Plains . 12. This is a circular, bowl-shaped crater with a rim raised above the surface of the surrounding lava plain . 13. It rises approximately 2500 vertical feet ( 762 m ) above the lava plain in southern National Monument. 14. As witnesses to the Tertiary volcanism of the area there are lava plains and isolated hills of basalt and phonolite. 15. In radar images, smooth surfaces such as lava plains generally appear dark, while rough surfaces such as impact debris appear bright. 16. Other examples are the Carrizozo Malpa�s and Jornada del Muerto Volcano lava plain , in the Tularosa Basin's Jornada del Muerto Desert. 17. The Brothers Fault Zone is also the locus of the High Lava Plains ( HLP ) volcanism of central and southeastern Oregon. 18. About 40, 000 refugees died of cholera and dysentery when they tried to settle on the volcanic lava plains around the town. 19. Volcanism in the High Lava Plains is bimodal, having both basaltic ( mafic ) and rhyolitic ( silicic ) types of lava. 20. The subsidence of the crust produced the large plateau a large, slightly depressed lava plain sometimes also known as the Columbia Basin.
