[4] Specimens consist only of incomplete leafless stems, some of which bore groups of spore-forming organs or sporangia which were fused, at least at the base.

[1] Fossils of Yarravia were found at a location called the 'Yarra Track', near to the town of Wood's Point, Victoria, Australia.

The dating was based on graptolite fossils which were identified as Monograptus uncinatus, which is of early Ludlow age (around 430 to 420 million years ago).

These were subsequently described as a new species, M. thomasi, which proved to be of Early Devonian age (Pragian, around 410 million years ago).

The specimens are flattened, so that the original shape is not entirely clear, but up to five or six upright elongated sporangia appear to have been radially arranged on a base formed by a widening of the stem; there may have been a central space.

[1] The genus Yarravia was named in 1935 by Lang and Cookson, based on fossils found in an Australian locality they called the 'Yarra Track'.