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Volborthellidae

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Аннотация к книге "Volborthellidae"

High Quality Content by WIKIPEDIA articles! Volborthella is an animal of incertain classification, whose fossils pre-date 530 million years ago. It has been considered for a period a cephalopod. However discoveries of more detailed fossils showed that Volborthella’s small, conical shell was not secreted but built from grains of the mineral silicon dioxide (silica), and that it was not divided into a series of compartments by septa as those of fossil shelled cephalopods and the living Nautilus...

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Издательство: Bookvika publishing
ISBN: 978-5-5118-0528-3

Книга находится в категориях

Геодезия Геология Биология

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