NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Fossil graptolites (Monograptus sp.). Graptolites were colonial animals which lived in abundance in Palaeozoic seas. A colony consists of one or more branches along which are arranged cup-like thecae, each of which originally housed a single animal. The slanting arrangement of the thecae causes the saw-blade appearance of the colony.
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