There are three types of rocks in Emperor: normal, copper ore-bearing, and iron ore-bearing. Normal rocks contain no metal ores, but metal can be mined from the other types; see p.52 for details.
A Pinnacle is a large, towering rock (seen in many Chinese paintings), often lined with a few trees and with a small (albeit unusable) shrine on top. Nothing can be built on a pinnacle.
Salt Marsh terrain provides salt, which is used as a food supplement (see p.48). Only roads and salt mines (see p.54) can be built on a salt marsh, and the terrain is passable for all walkers (see p.34).
Ruins represent the remains of a past city. For game purposes, they have the same function as "rubbled" buildings.
Stone Quarries are areas where stone blocks can be extracted from the ground. See p.52 for details.
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