Clearwater. 1 Aulacoseira alpigena (6273) 2 Aulacoseira subarctica (?) (6276) 3–5 Aulacoseira ambigua (6275, 6276) 6, 7 Aulacoseira italica (6277) 8 Lindavia praetermissa (6277) 9, 10 Tabellaria flocculosa (6279) 11–14 Fragilariforma nitzschioides (6281) 15–17 Meridion circulare (6279, 6281) 18 Fragilaria sp. [Ulnaria sp. PH] (6281) 19, 20 Synedra famelica (?) (6280). Scale bar: 10 µm.