41. The quartzite, which lies unconformably on gneissic basement rock , has been analyzed for traces of Precambrian life. 42. To the north of the N 065-striking fault the basement rocks consist of Plagioclase-bearing paragneisses. 43. I put ( an electric ) pickup on my violin, played in basement rock bands and got into improvising. 44. Many monoclines ( a type of gentle upward fault in the Precambrian basement rocks hidden well below any exposed formations. 45. The basement rocks have experienced metamorphism related to their original depth in the Earth's Variscan and Tertiary age. 46. All of the productive units are of Miocene age, and the underlying basement rocks date to the Jurassic period. 47. Modern geologists have documented four major deformational events that basement rocks and occurred around 1, 700 million years ago. 48. Hidden below a more than 6000 metre thick Mesozoic cover are probably more than 6000 m of Paleozoic basement rocks . 49. The Tonto Group units were deposited on an ancient erosion surface ( angular unconformity ) on the Vishnu Basement Rocks . 50. Much of the western two-thirds of the country consists of the Pliocene Pleistocene volcanics deposited on Precambrian basement rocks .
