The Cainozoic geology of the Middle Shoalhaven Plain

Ruxton, Bryan P.; Taylor, Graham R.

doi:10.1080/00167618208729207

Cited by 26 publications

(17 citation statements)

References 12 publications

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“…On the basis of our findings in the Monaro, and those of Ruxton and Taylor (1982) in the Shoalhaven, we suggest that perched prebasalt valleys are the result of continued cutting towards grade in response to a pre-basaltic uplift as earlier suggested by Bishop and Young (1980). The presence of Oligocene basalts at the coast between Nowra and Ulladulla (Wellman & McDougall 1974;Young & McDougall 1982) suggests that the coastal lowlands in that area are at least Oligocene, and probably older.…”

Section: Discussionmentioning

confidence: 57%

“…is true, then it is surprising that none of the streams have incised substantially below their pre-basaltic beds. Similar situations occur nearby in the Endrick and Shoalhaven Rivers (Craft 1932;Young 1977;Ruxton & Taylor 1982).…”

Section: Discussionmentioning

confidence: 71%

“…Ruxton and Taylor (1982) report that the Shoalhaven River is, along its middle reaches, occupying its Eocene course over a land surface of possible Mesozoic origin. The evidence from the Lachlan, Shoalhaven and Monaro are that the drainage systems of this part of the highlands are of considerable antiquity, as are the land surfaces over which they flow.…”

Section: Discussionmentioning

confidence: 98%

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Pre‐basaltic topography of the Northern Monaro and its implications

Taylor

Bink

Foudoulis

et al. 1985

Australian Journal of Earth Sciences

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 98%

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Pre‐basaltic topography of the Northern Monaro and its implications

Taylor

Bink

Foudoulis

et al. 1985

Australian Journal of Earth Sciences

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“…1). These determinations, together with studies of the deep weathering and of the dissection of the landscape, provide an exceptionally detailed Cainozoic history (Craft 1932;Wellman & McDougall 1974;Young 1977;Ruxton & Taylor 1982;Young & McDougall 1982). However, because of the difficulty of obtaining fresh basalt outcrop at Sassafras in the south-eastern part of the catchment, an important gap remained in the regional chronology.…”

Section: Introductionmentioning

confidence: 97%

The age, extent and geomorphological significance of the Sassafras basalt, south‐eastern New South Wales

Young

McDougall

1985

Australian Journal of Earth Sciences

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Basalt at Sassafras was erupted in the Middle Eocene. The K-Ar ages average 45.3 ± 4.9 Ma on whole rock and 48.4 ± 1.9 Ma on plagioclase. The basalt is not limited to a plateau capping, but extends 150 m down into adjacent valleys. Comparison with nearby Eocene basalts shows that there was in excess of 250 m of local relief in the central Shoalhaven valley by the Early Tertiary. The basalts were extruded at high elevation, and denudation of the coastal margin of the upland was already well advanced. Post-basaltic denudation has been very slow, and the Early Tertiary landscape is well preserved.

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“…3b). Concretionary pillow-like, mammiform or botryoidal shapes (referred to as 'cockades' and 'glerps' in the Australian literature) are common, and have been attributed to progressive or centripetal cementation (Callender, 1978;Ruxton and Taylor, 1982;Thiry and Marechal, 2001). …”

Section: Characteristics Of Non-pedogenic Silcretesmentioning

confidence: 99%

Distinguishing pedogenic and non-pedogenic silcretes in the landscape and geological record

Ullyott

Nash

2016

Proceedings of the Geologists' Association

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Silcrete is a type of duricrust formed by the near-surface accumulation of secondary silica within a soil, sediment, rock or weathered material. A variety of models of formation have been put forward, involving silicification in both pedogenic and non-pedogenic settings.The resulting silcrete types differ in terms of their macroscale characteristics, micromorphology, areal extent and behavioural properties. Such differences have significant implications in a range of geological, geomorphological, archaeological and engineering contexts, making the correct identification of silcrete type of considerable importance. This paper reviews the properties of pedogenic, groundwater, drainage-line and pan/lacustrine silcretes, and identifies many characteristics that may be diagnostic. It also discusses a number of more problematic macro-and micro-scale features common to both pedogenic and non-pedogenic silcretes. It concludes with a short checklist to aid the future identification of different silcrete types in the landscape and geological record.

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The Cainozoic geology of the Middle Shoalhaven Plain

Cited by 26 publications

References 12 publications

Pre‐basaltic topography of the Northern Monaro and its implications

Pre‐basaltic topography of the Northern Monaro and its implications

The age, extent and geomorphological significance of the Sassafras basalt, south‐eastern New South Wales

Distinguishing pedogenic and non-pedogenic silcretes in the landscape and geological record

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