Shaping calcium carbonate: Biological and environmental controls on polymorphism Calcium carbonate (CaCO₃) is among the most widespread chemical compounds on Earth.
Already in the Late Triassic, turtles attained global distribution, yet only a single species, Proganochelys ruchae, had been described from the eastern part of Pangea (Thailand, in the 1980s).
Geochemical studies of Recent echinoids from a variety of environments have shown that incorporation of trace elements into their skeleton is partly dependent on environmental factors such as salinity.
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