IGNEOUS ROCK • DICTIONARY ONE.COM • Definition of Igneous rock

... has scratched the varnish on the globe, and forthwith frames his new theory of creation. In ten years he is proved utterly wrong by that microscopist who has detected animal remains in an igneous rock. The simple bystander cannot understand either side, and far less tell which side is true. But when the combatants slay each other, the wayfaring man can understand this neutralization. The philosopher strikes me with awe so long as he keeps aloft beyond my knowledge ...

— The Voyage Alone in the Yawl "Rob Roy" • John MacGregor

... diameter of six inches to the depth of 425 feet, and after that it is reduced to four inches. For about three thousand feet the strata penetrated were of carboniferous and magnesian limestone alternating with sandstone. The remainder of the well passes through igneous rock. At St. Louis the Missouri and Mississippi rivers are not more than twenty miles distant from each other, and it is worthy of note that the waters of neither of those two rivers appear to have opened for themselves a considerable subterranean passage through the rocky ...

— The Earth as Modified by Human Action • George P. Marsh