Journal and Proceedings of
The Royal Society of New South Wales
Volume 113 Parts 3 and 4 [Issued 13 April 1981]
CONTENTS
| AUTHORS & TITLES | PAGES |
Part 3 |
|
| King, David S., Proper Motions in the Region of the Galactic Cluster NGC 4755 | 65-68 |
| Johns, Stanley R., Nuclear Magnetic Resonance in Polymer Studies | 69-80 |
| Martin, Helene A., Stratigraphic Palynology from Shallow Bores in the Namoi River and Gwydir River Valleys, North-Central New South Wales | 81-87 |
Part 4 |
|
| Leitch, Evan C, and Bocking, Malcolm A., Triassic Rocks of the Grants Head District and the Post-Permian Deformation of the Southeastern New England Fold Belt | 89-93 |
Vol 113 pt 3, pp.65-68
Proper Motions in the Region of the Galactic Cluster NGC 4755
David S. King
Abstract. Relative proper motions in the region of the galactic cluster NGC 4755 are determined with the aim of identifying starts which are non-members. The relative proper motions have an average standard error of 0."06/century and reveal 89 likely members and 75 likely non-members.
Vol 113 pt 3, pp.69-80
Nuclear Magnetic Resonance in Polymer Studies
Stanley R. Johns
Liversidge Research Lecture delivered before the Royal Society of New South Wales, 19 June 1980.
Abstract. 13C nmr spectroscopy is now extensively used in both synthetic and biological polymer studies. Stuctural and dynamic properties of a polymer can be determined from the 13C nmr chemical shift and relaxation time parameters. Examples of both the synthetic and biological fields are presented together with descriptions of new techniques for the analysis of end groups and the determination of tacticity in synthetic polymers.
Vol 113 pt 3, pp.81-87
Stratigraphic Palynology From Shallow Bores in the Namoi River and Gwydir River Valleys, North-Central New South Wales
Helene A. Martin
Abstract. The palynology of over fifty bores drilled into the Cainozoic sediments covering the Coonamble Embayment, Broomi Trough and Lightning Ridge Shelf of the Surat Basin are reported here. The Early Cretaceous bedrock is either the Dictyotosporites speciosus Zone or less frequently, the Crybelosporites stylosus Zone, and is encountered everywhere. The Cainozoic alluvial sediments are: (1) the mid-late Miocene Triporopollenites bellus Zone which has a patchy distribution throughout the area. It is restricted to the deeper, consistently grey clays, and in some bores, directly overlies the Early Cretaceous bedrock: (2) Pliocene-Pleistocene assemblages found only near Narrabri and (3) Pleistocene assemblages near Moree.
Tertiary deposition on the Early Cretaceous landscape started in the mid-late Miocene. The vegetation must have been a floristically rich closed forest, and the rainfall at least 150cm per annum. There was a subsequent decrease in rainfall. The Pliocene-Pleistocene floras are less diverse, but there were still substantial areas of closed forest. The Pleistocene floras represent open woodland with a well developed herbaceous ground cover.
Vol 113 pt 4, pp.89-93
Triassic Rocks of the Grants Head District and the Post-Permian Deformation of the Southeastern New England Fold Belt.
Evan C. Leitch and Malcolm A. Bocking
Abstract. Folding and faulting of the Early Triassic Camden Haven Group show that significant deformation occurred in the eastern part of the New England Fold Belt subsequent to the Late Permian orogenic climax. Continuing activity from the Late Permian into the Triassic is indicated by near parallelism of basement faults, axes of rapid stratal thickening in the Early Triassic sequence, and faults and the axial traces of folds affecting these rocks. This relationship also suggests that deformation of the Camden Haven Group resulted mainly from movement on basement faults, although serpentinite diapirism may have been a contributory factor.
The Jolly Nose Conglomerate is a new formation in the Camden Haven Group, introduced for rocks lying between the Palaeozoic basement and the Laurieton Conglomerate in the Grants Head district.