Legacy product - no abstract available

Legacy product - no abstract available

No abstract available

These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

These documents have been scanned by the GA Library. Please refer to the document for contents.

Late Tertiary intermontane lacustrine and fluviatile deposits in the Morobe District of New Guinea contain vertebrate fossils in association with dated pyroclastic rocks. Metamorphic rocks ranging in age from probable Palaeozoic to middle or late Cretaceous form a complex basement into which granodiorite plutons were intruded in the late Cretaceous or early Tertiary. From probable Oligocene or Miocene time porphyritic rocks intruded the metamorphics and granodiorite; this activity culminated in explosive vulcanism which produced vast quantities of agglomerate. The agglomerate blocked the drainages, and lacustrine and laterally restricted floodplain deposits formed behind the dams during the Pliocene. A formation, the Otibanda Formation, which includes lacustrine sediments, f100dplain deposits, and interbedded tuffs is formally defined. Its thickness cannot be estimated, but a measured section is more than 2500 feet thick. The type section at 'Sunshine' contains fossiliferous sandstone and mudstone with conglomerate and intercalated pyroclastic rocks which yield Potassium/Argon dates from below the mammal horizons of 6.1 and 7.6 million years. A 5.7 million year date higher in the section is associated with the type faunal locality, which has produced an incisor of the earliest known rodent from the Australian region and new representatives of the marsupial families Ma«ropodidae and Diprotodontidae. The fauna also includes gastropods, crocodilians, snakes, birds, and a dasyurid. Fossil vertebrates have been collected from 21 widely scattered localities.

A collection of Palaeontological paers, 1966.

The R502 series of maps has been replaced by the National Topographic Map Series (NTMS). The R502 series consists of 542 map sheets and covers Australia at a scale of 1:250,000. It was compiled from aerial photography, but only about one quarter of the series was contoured. The standard sheet size is 1 degree of latitude by 1.5 degrees of longitude. Transverse Mercator map projection and Clark 1858 datum were used. Coverage of the country was completed in 1968.