rock-structure

Updated: August 26, 2026

I think I may claim to have shown that there are some analogous features of terrestrial rock-structure to serve as guides towards a natural and intelligible explanation of the strange geometric markings discovered during the last thirty years, and which have raised this planet from comparative obscurity into a position of the very first rank both in astronomical and popular interest.

Alfred Russel Wallace - Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation

Then geysers of hot ash and molten rock spouted upward; some of the white-hot debris landed almost at the acid river, half-way to the armor-tender. "We've started a first-class earthquake, too," Murillo said, looking at the instruments. "About six big cracks opening in the rock-structure.

H. Beam Piper - Ullr Uprising