The Ramu-valley in North-East New Guinea is the result of the young geological development of the North of the Central Ranges lying areas. As such it is part of a long trough formed in the Late Tertiary and since filled with sediments from
the enclosing mountains of which the Coastal Ranges itself have only been formed by an upheaval since the Late Tertiary too. The alluvial deposits of the Ramu-valley are divided in dissected older fans and younger floodplains of varying degreee. Large areas
sequence. They were part of a Tethyan area of deposition now widely dispersed in North America, New Zealand, and Southeast Asia by subsequent sea-floor spreading and accretion onto the continents bordering the Paleo-Pacific.
This overview of the Great Barrier Reef area shows that different parts of the same reef may have responded differently to sea-level change. The new terms keep-up reefs, catch-up reefs, give-up reefs are proposed. The conditions of reef initiation
Guinée). Chaque volume est accompagné d'un Atlas de cartes en couleur à 1:250000 (Physiography, catchment areas, soils associations) et au 1:150000 (land systems and land regions, land use 1962-69, Agricultural opportunity areas, Forest types). (AHL).
-contemporaneous extrusion of alkali basalts over much of the New Zealand area and renewed onset of rifting on the West Coast were related to the opening of the Tasman sea and the beginning of separation form Antarctica.
d'Eucalyptus fastigata et E. pauciflora. Voir également sur la même région: J.C. TURNER. An altitudinal transect in rain-forest in the Barrington Tops area, New South Wales, Aust. J. Ecol., 1976, t.1, n3, p.155-174. (AHL).
The article presents the use of granulometric analysis for the reconstruction of the morphodynamics of an ephemeral stream channel in an arid climatic area. Five deposit facies were identified: bed load, chute, channel bar, natural levee and channel
and sediment loads have been drastically modified, and sedimentation has accelerated in many estuaries and deltaic areas, as well as locally in coastal waters off river mouths. The pattern of impact is traced in each of the river catchments, and at and around