Hi @strauss the orange exposure shown under the Mt Roe Basalt is...

Hi @strauss the orange exposure shown under the Mt Roe Basalt is not Hardey Formation but likely an artifact of the colours selected for the map. HF is younger than and over lies the MRB as per the map you included and also the Australian Stratigraphic Database. The orange conglomerate under the MRB appears to be undocumented but is not HF. There is HF in the west of the southern tenement shown but not elsewhere.

Cheers BS