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The Biga Peninsula, in northwest Türkiye, is enriched with metallic ore deposits related with epithermal systems and with kaolin and silica deposits derived from acid-sulphate and alkali-chloride fluids respectively. Hamamtepe Quartz Quarry and large sinter mounds in Biga have developed within the Etili geothermal systems Mineralogical and petrographic studies were carried out to determine the structure of the Hamamtepe quartz and to identify the lithofacies. The network structures that developed on the surfaces of the Hamamtepe quartz sample and intertwined with these networks, hyphae, biofilm structures and spherical diatom/pollen? are identified to be resulted from the bacterial activity. These findings revealed the existence of a poorly known paleo-fauna in the region. The remains of paleo-microfauna obtained from Hamamtepe and its surroundings revealed that the silica precipitation in the region was effective in biotic activities as well as abiotic conditions. Documented fossil micro-structures and remains deposited. The documented fossil microstructures and remains revealed that the silica precipitation environment due to biotic activities occurs in the water pools located on the slopes of the proximal apron right next to the water outlet channels or by the thermophilic creatures living in the channels in alkaline-chloride type neutral waters at a range of approximately 60-95 °C. [ABSTRACT FROM AUTHOR]