By Professor Jean-Claude Gall (auth.)
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Additional resources for Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology
The size of individuals is also generally rather small compared to members of the same Constraints on Living Conditions 24 Fig. 19. Diversity of present-day faunas and floras in relation to the salinity of the water. -L---'---'---'---'--_ 5 15 25 35 0 '00 Salinity species which lived in water of normal salinity. The shells are also usually thinner than in marine forms. Similar modifications occur in hypersaline waters (salinity greater than 450/00 ). The brackish or hypersaline faunas of the Bunter Sandstone and the Keuper of the Germanotype facies compared with those of the Muschelkalk sea illustrate these different adaptations.
Their presence indicates brackish water. Similarly, most stromatolites can be attributed to algal structures developed close to the shoreline in water of varying salinity (Fig. 22). ::» - Radiolaria siliconagellates Diatoms I , Calcareous foraminifera I I 60°/_ 50 ~ Coccoliths:::::>- I I Agglutinated test forarns I Hypersaline water ; ====--f-- 40 , Red algae Blue-green algae I AIiOgrOmii~-- Limits of the marine realm > Oemosponges I - Calcareous sponge ~ Hexactinellids < , I -=:: ----<-- Conchostraceans - - .
In order to reconstruct ancient environments, it is extremly important to be able to determine their physicochemical characteristics and, through them, to explain the diversity of habitats and their populations. Chapter 3 Evidence of Biological Activity The evidence of biological activity includes remains, other than body fossils, which have been left in sediments by living organisms. They reflect different aspects of life: reproduction (spores, pollen, eggs), feeding (bite marks, coprolites), movement (tracks and trails), habitat (borrows), etc.
Ancient Sedimentary Environments and the Habitats of Living Organisms: Introduction to Palaeoecology by Professor Jean-Claude Gall (auth.)