Linked from
The 24 pages that link to Diatom, each with the reason it gives.
Silicon dioxideRelated: Diatoms build biological silica structures that accumulate in sediments.
VarveRelated: Seasonal blooms can add distinctive biological material to lake sediment layers.
ChertRelated: Their silica shells can contribute to the sediments from which some chert forms.
PaleolimnologyRelated: Diatom assemblages help infer past lake chemistry, nutrients, and ecology.