Fossil Diatoms and Geology

Algal Pigment and Fossil Diatoms

The overarching aim of this paper is to investigate the lake ecosystem response to different 13 drivers over a long term period by a paleolimnological study in Lake Narlay (46°64N, 5°91E) located 14 in the Jura Mountains of France. It is a small, hard-water lake with a maximum water depth of 40 m 15 and extended anoxic condition of the bottom water. Previous results on sediments analysis have 1...

Fossil diatoms in a new carbonaceous meteorite

We report the discovery for the first time of diatom frustules in a carbonaceous meteorite that fell in the North Central Province of Sri Lanka on 29 December 2012. Contamination is excluded by the circumstance that the elemental abundances within the structures match closely with those of the surrounding matrix. There is also evidence of structures morphologically similar to red rain cells tha...

Transparent Exopolymeric Particles (TEP) Selectively Increase Biogenic Silica Dissolution From Fossil Diatoms as Compared to Fresh Diatoms

Diatom production is mainly supported by the dissolution of biogenic silica (bSiO2) within the first 200m of the water column. The upper oceanic layer is enriched in dissolved and/or colloidal organic matter, such as exopolymeric polysaccharides (EPS) and transparent exopolymeric particles (TEP) excreted by phytoplankton in large amounts, especially at the end of a bloom. In this study we explo...

Geology of Centennial Valley and Stratigraphy of Pleistocene Fossil-Bearing Sediments

Epipsammic diatoms of diatoms of Kelkit Creek (Tokat/Turkey)

In this study, diatoms in epipsammic samples, which were taken from two stations selected in Kelkit Creek (Tokat/Turkey) between March and December 2018, were analyzed. During the study, a total of 25 taxa belonging to diatoms were recorded. The diatom species represented by the highest number of taxa were Cymbela (4 taxa), Nitzschia (4 taxa), and Navicula (3 taxa). Sorensen similarity index be...