It shows a man with an exaggerated, erect penis juxtaposed with a goat.
However, there is some doubt that the two figures are contemporary; while the goat is depicted in characteristic palaeolithic style, the scene may have been altered in a later period with the insertion of the human figure.
UPDATE, 4.20pm: THE SECOND man accused of committing acts of bestiality and animal cruelty in Nimbin late last year has had his matters heard in court.
Similarly to his alleged partner in crime, Bradley Presbury did not appear before Lismore Local Court via video link.
Magistrate David Heilpern said their names had been widely published in the media and said there was "clearly media interest in the matter".
He then raised the matter of public interest relating to the case, saying Parke was charged with a serious indictable offence of bestiality.
There's also some concern among law enforcement about links between such acts and other crimes.
A Virginia police detective who has spent years focused on internet crimes against children said he's seen links between bestiality and child sex abuse.'I found that people who were engaged in crimes against children were also engaged in sexual crimes against animals,' Fairfax County Detective Jeremy Hoffman said.
Possibly the oldest depiction, and the only known example from the Palaeolithic (prior to the domestication of animals), is found in the Vale do Côa in Portugal.
It's now officially illegal in Ohio for people to have sex with animals.
The state did not have anti-bestiality laws on the books until the change took effect last week, making sexual conduct or related acts with animals punishable by jail time and fines.
He also indicated he was in possession of indecent images, which he was prepared to share with like-minded individuals." Police went to the defendant's home at 7.35pm on June 15 and seized electrical equipment.
Read more: Sex offender Philip Capel claims reports of his crimes have made his life worse The computers were analysed and contained 299 indecent images at category A – the most serious.