The importance of Scotland's rocks, minerals, sediments and soils, and the forces that formed them across three billion years, are recorded in the world's first geodiversity charter.
The charter was launched yesterday by the Scottish Government to raise the profile of the nation's geological heritage.
Glasgow's geodiversity includes drumlin glacial landforms.
Edinburgh's Castle Rock, once a volcano, and the variety of building stone used in the construction of the New Town, are examples of the capital's geodiversity.
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