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Calcareous Algae and Stromatolites (Paperback, Softcover reprint of the original 1st ed. 1991)
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Discovery Miles 28 730
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Calcareous Algae and Stromatolites (Paperback, Softcover reprint of the original 1st ed. 1991)
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"Calcareous algae and stromatolites" is shorthand for a wider array
of organisms and fabrics that also includes calcified
cyanobacteria, plus thrombolites and other microbial carbonates.
Composition is the link: these are all important components of CaC0
sediments, from 3 Archaean to present and from the ocean floor to
streams and lakes. It is hardly possible to examine limestones of
any age without en- countering them. Simultaneously they are
fossils, sediments, and en- vironmental indicators. It is the range
of significance, coupled with the breadth of their distribution in
time and space, which compels their study. Modern calcareous marine
algae mainly include reds (corallines, squamariaceans, and the
nemalialean Galaxaura) and greens (dasy- cladaleans, udoteaceans,
halimedaceans). Blue-greens, of course, are cyanobacteria and not
algae, and significantly, although they are largely responsible for
Recent tidal flat stromatolites, they are not calcified in the same
way that pre-Cenozoic marine blue-greens are. It is in the
freshwater environment of calcareous streams and lakes that we find
modern calcified cyanobacteria, and they are commonly associated
with the only major group of non-marine calcareous algae, the
charophytes. However, in the past, and especially in the Palaeozoic
and Mesozoic, things look radically different. Mingling with the
ancestors of the modern flora are distinct, and often problematic,
organisms.
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