Waterton. 1–3 Staurosirella lapponica (4520, 4532, 4542) 4 Staurosira sp. (4545) 5 Staurosirella sp. [cf. S. pinnata] (4568) 6Pseudostaurosira brevistriata var. inflata (4533) 7 Staurosira oldenburgioides (4562) 8 Staurosirella sp. [cf. S. leptostauron] (4562) 9 Staurosira construens (4542) 10 Diatoma moniliformis (4547) 11, 12 Meridion lineare (4532) 13 Tabellaria flocculosa (4520) 14 Eunotia juettnerae [E. bilunaris PH] (4538) 15 Eunotia arcus (4542) 16 Eunotia botuliformis (4520) 17 Eunotia rhomboidea (4569) 18 Fragilaria sp. (4520) 19 Fragilaria crotonensis (4532) 20, 22 Fragilaria tenera (4532) 21 Fragilaria nanana (4520) 23 Ulnaria ulna (4546) 24 Synedra sp. [cf. S. acus var. delicatissima] (4520). Scale bars: 10 µm.