| | Book (edition) | involved in land surveying in England. From visits to mines, he early recognized regularity to the rock succession...which already had been demonstrated locally in coal mines (Fig. 2.7). 22 EVOLUTION OF THE EARTH Extensive...rock outcrops are rare, artificial excavations and mines were of great importance in helping Smith to formulate...useful, not only for planning canals, quarries, and mines, but also as a guide to soils. Its author long since...earth could not be much older than that. From deep mines an approximate rate (or gradi¬ ent) of the downward |
|