How does flint form geologically?

Flint forms geologically through the accumulation of silica, primarily from the remains of marine organisms like diatoms and radiolarians, which settle on the ocean floor. Over time, this silica is cemented together by mineral-rich waters, leading to the formation of nodules or layers of flint within chalk or limestone deposits. The process involves both biological and geological activities, including diagenesis, where pressure and chemical reactions transform the sediment into solid rock. Eventually, erosion can expose flint, making it accessible for use as a tool or for decorative purposes.