Geologica by noogenesis
Adds realistic geology in the form of new types of rocks and ores. The distributions are completely customizable, either via the GUI during world creation, or by directly modifying the CustomOreGen config.
Who you gonna call? With this mod, you can not only becone one of the Ghost-Busting crew but also relive their greatest adventure as you hunt ghosts throughout your world and even fight the infamous Gozer the Gozerian and Mr. Stay Puft!