This graptolite fossil measures 1 cm wide and 1.3 cm high.
Graptolites were marine animals that formed twig-like or net-like colonies containing many individual microscopic individuals. The colonies mostly floated in the oceans, but some were attached to the sea floor.
Because they were abundant, they fossilised well, and various shapes evolved over time, graptolites are an important group of fossils used as markers to date rocks of Ordovician to early Devonian age. Those found in marine sedimentary rocks from the Ordovician in Victoria are of world-wide significance.