1. Intrusion of the breccia is interpreted to have been produced by the accumulation of pools of intrastratal fluids in structural traps, which under pressure intruded and stoped into overlying strata, eventually reaching a Goulburn paleosurface where they extruded mud flows and formed sedimentary volcanoes.

On interprète l'intrusion de brèches d'abord par l'accumulation de réservoirs de fluides intraformationnels dans des pièges structuraux qui, sous pression, ont ensuite pénétré et creusé dans les strates susjacentes pour atteindre enfin la paléosurface du Goulburn où les liquides se sont épanchés en coulées boueuses et ont formé des volcans sédimentaires.

2. metamorphites, Mesozoic igneous intrusive rocks, Tertiary volcanic and sedimentary breccias, and Quaternary alluvia. The Precambrian Halloran Complex has been subdivided into the following formations: (1) Silver Lake Peak Formation, mostly quartzofeldspathic gneisses; (2) Cree Camp Formation, quartzites and metarhyolites; (3) Riggs Formation, metamorphosed carbonate rocks. This complex is intruded by dioritic rocks. Regional metamorphism produced parageneses of the almandine amphibolite facies. Metablastesis was a major phenomenon, partial fusion was a local one. The rocks are, therefore, metatexites. Regional metamorphism was followed by diaphthoresis, accentuated in a zone of dislocation.

Les « Halloran Hills » sont composés de roches métamorphiques précambriennes, re roches ignées intrusives mésozoiques, de brèches volcaniques et sédimentaires tertiaires ainsi que de galets quaternaires.