BIOL360 Lecture 5: Lecture 5 notes
26 Mar 2018
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** rock forming organisms*: organic skeletons dinoflagellates, chitinozoans, calcareous skeletons nanoplankton, coccolithophores, foraminiferans (considerable. Siliceous skeletons diatoms, radiolarian, testate amoeba: external shells tests; enclosed resting stages cysts, kingdoms protozoa and chromista biostratigraphic and paleoenvironmental importance) Marine unicellular planktonic protists have opaline silica framework and feed on bacteria + phytoplankton. Radiolarian cherts (where radiolarians fossilize) common with ophiolites (uplifted deep mantel rocks: become abundant in ordovician. Dinoflagellate blooms/red tides lead to asphyxiation of other organisms because they consume copious amounts of oxygen fossil red tides: alternated between motile and cyst stage. Chitinozoa have organic skeletons composed of pseudo-chitin; common in fine grained sediments, usually anoxic environments; only biota in black shales.
