In the Taemas-Wee Jasper area, the Murrumbidgee Group comprises of three formations: The oldest Cavan Limestone, the middle Majurgong Formation, and the youngest Taemas Limestone Formation. In addition, the Taemas section is split into six constituent members. The Cavan Limestone is also known as the Cavan Bluff Limestone, although this name has fallen out of use as it can cause confusion with the more restricted term 'Bluff Limestone' used by previous workers.
Cavan Limestone
The Cavan Limestone is composed of three subdivisions; a lower 48 metres (157ft) section made of flaggy limestone and shale; 48 metres (157ft) of a middle 'Bluff limestone', and 32 metres (105ft) of thinly-bedded limestone in the upper strata. The designated type section is at Clear Hill within the Cavan area, under the power cables there. Similarities between the Taemas-Cavan and Wee Jasper areas suggest that either preservation akin to a coastline, or a broad tidal flat, was the likely depositional environment of the Cavan Limestone.
Majurgong Formation
The Majurgong Formation, a non-calcareous unit consisting primarily of lithic sandstones and shale, features sedimentary structures which preserve cross-bedding and ripple marks. Except in road cuttings in the lower strata where brachiopods and gastropods are known from, the majority of the formation is unfossiliferous. These perhaps suggest brackish water conditions, supporting the interpretation that the Majurgong Formation as being a non-marine deposit, an interruption of the usually shallow and marine deposition within the Murrumbidgee Group, possibly being laid in an estuarine environment. The Majurgong Formation is about 120 metres (390ft) in the Wee Jasper area.
Taemas Limestone
The Taemas Limestone starts with its oldest bed, the Spirifer yassensis Limestone Member, which grades out of the uppermost Majurgong Formation. It is the lowest of the six members of the formation. Similar to the Bloomfield Limestone Member, which is the third lowest, the S. yassensis Member consists of calcareous shales and interbedded limestones, and its outcrops tend to be regressive in nature. This is in stark contrast to the Currajong and Receptaculites Limestone Members (5th and 3rd highest respectively), which showcase small reefal bodies within the Goodradigbee valley. Near Taemas-Good Hope, similar large Receptaculites beds are found within the eastern limestone outcrop. The Taemas Formation is thicker in the western Goodradigbee valley 1,000–1,100 metres (3,300–3,600ft), compared to the east where it measures only ~800 metres (2,600ft).
Below is a table of the full stratigraphical layout of the Murrumbidgee Group in the eastern outcrop:
Lowermost part of the upper part of the Taemas Limestone. This section has common marine macrofossils, and abundant tabulate & rugose corals (level uncertain)
↑White, Errol Ivor; White, Errol Ivor; Toombs, Harry A. (1972). "THE BUCHANOSTEID ARTHRODIRES OF AUSTRALIA". Bulletin of the British Museum (Natural History) Geology. 22: 379––419.
