The geology of the Bursa Plain and surrounding areas is varied, with sedimentary, metamorphic and igneous
rocks of different eras, from Palaeozoic to Quaternary, all present. Such variation in bedrock (together with other
factors) has given rise to the many different types of soils found here. These different soil types vary in terms of
their fertility, which as a result greatly influences the agricultural activities present on and settlement of each
area.