Güvem Formation

The Güvem Formation is a geologic formation in Turkey. It contains plant fossils dating back to the Early Miocene, and is especially notable for preserving evidence of insect damage to plants.^[1] The formation is roughly 1,100 metres (3,600 ft) thick and is made up of pyroclasts, rhyolite, andesite and various dacites.^[2] Pollen grains from this formation have been researched and indicate the presence of mixed-mesophytic forest in the range 17.9 to 17.8 million years ago.^[3]