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Late Devonian fishes from the Munabia Sandstone, Carnarvon Basin, Western Australia.

January 1991

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Flinders University

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Upper Devonian microvertebrates from the Canning Basin, Western Australia

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Mar 2015
ACTA GEOL POL

A diverse microvertebrate fauna is described from the Virgin Hills and Napier formations, Bugle Gap Limestone Canning Basin, Western Australia. Measured sections at Horse Spring and Casey Falls (Virgin Hills Formation) and South Oscar Range (Napier Formation) comprise proximal to distal slope carbonates ranging in age from the Late Devonian Frasnian to middle Famennian. A total of 18 chondrichthyan taxa are identified based on teeth, including the first record of Thrinacodus tranquillus, Cladoides wildungensis, Protacrodus serra and Lissodus lusavorichi from the Canning Basin. A new species, Diademodus dominicus sp. nov. is also described and provides the first record of this genus outside of Laurussia. In addition, the upper range of Australolepis seddoni has been extended to Late Devonian conodont Zone 11, making it the youngest known occurrence for this species. The Virgin Hills and Napier formations microvertebrate faunas show close affinities to faunas recovered from other areas of Gondwana, including eastern Australia, Iran, Morocco and South China, which is consistent with known conodont and trilobite faunas of the same age.

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Field investigation of the Late Silurian Tumblagooda Sandstone of Kalbarri, Western Australia demonstrates that the lower part of the formation comprises a unit of fluvial trough crossbedded sandstone (450 m) overlain by previously unrecognized aeolian sandsheet deposits (350 m) which include small (to 2 m) aeolian dunes. Interbedding of aeolian and fluvial facies is present and fluvial facies ... [Show full abstract] decrease in importance down the fluvial transport path which was to the west and northwest. Aeolian transport was to the southeast and resulted in formation of medium- to coarse-grained low-angle sandsheets and small parallel-crested dunes. Fluvial transport in aeolian-dominated areas was deflected to the southwest along interdune corridors. Interdune deflation areas were frequently flooded, probably by rising ground water. Traces fossils are abundant, including beds bioturbated by Heimdallia and numerous arthropod trackways which cross aeolian strata. The dominance of sandsheet relative to dune morphologies is ascribed to the following factors: (1) mediumcoarse sand grain size, (2) high water table, and (3) short aeolian transport distance between fluvial channels not permitting extensive dune formation. A lack of vegetation is essential for development of fluvial and aeolian sandsheet facies. Fluvial sandstones were cemented by quartz overgrowths with only minor compaction. Aeolian dune sandstones have only minor quartz cement but show greater chemical compaction effects. Porosity retention is better in the aeolian sandstones. The Taylor Group of Antarctica which is thought to be of early Devonian age shows strong similarities to the Tumblagooda Sandstone in terms of trace fossil assemblages, and sedimentology.

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Oswald Heer

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