Cyanophyten aus oberjurassischen Algen—Schwamm‐Riffen

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Abstract
Blue-green algae of the families Rivulariaceae, Oscillatoriaceae, Stigonemataceae and Nostochopsidaceae were identified by scanning electron microscopy in Upper Jurassic (Malm .delta. sponge reefs near Solnhofen-Eichstaett, southern Franconia [W Germany]. Algal growth may account for 50-75% of the volume of the reef limestone. ''Hollow-sphere'' algal structures up to 500 .mu.m predominate. Rivulariaceae are the typical form and act as main reef-building biotic component. Pellets, intraclasts and oncolites as well as stromatolitic and cryptalgal crusts are of blue-green algal origin. These observations introduce new aspects regarding the evolution of the siliceous-sponge reefs of the Upper Jurassic in southern Germany.