Aulacoseira praegranulata

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Journal Article
Published: 01 June 2015
Russ. Geol. Geophys. (2015) 56 (6): 947–958.
....) Hawort and Stephanodiscus niagarae var. pusanovae Genkal et Cherepanova; Sergeevskii— Staurosira construens var. venter (Ehr.) Grun., Aulacoseira italica (Ehr.) Sim., and representatives of the genus Cymbella with large valves (up to 175 µm in length); Terekhovka— Aulacoseira praegranulata var...
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Journal Article
Published: 01 April 2007
Russ. Geol. Geophys. (2007) 48 (4): 361–370.
... and Actinocyclus dominant in the lower section (up to 80% of all diatoms). They are Aulacoseira praegranulata var. praegranulata (Jouse) Simon., A. praegranulata var. praeislandica (Jouse) Moiss., Pseudoaulacoseira moisseviae (Lupik.) Lupik. et Churs., Actinocyclus krasskei Bradbury et Krebs...
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Series: AAPG Studies in Geology
Published: 01 January 2000
DOI: 10.1306/St46706C42
EISBN: 9781629810713
... The coexistence of Aulacoseira and Stephanodiscus indicates fresh waters with the former taxon occurring during periods of turbulence and high silica concentrations. Stephanodiscus may have replaced Aulacoseira during periods of silica depletion and low Si/P ratios. Assemblage 2, with its...