Abstract

The Wahgi Valley is a structural depression, between the Bismarck Fault Zone to the north and the Kubor Anticline to the south, which has been enlarged by erosional removal of northward-dipping sedimentary rocks on the northern flank of the Kubor Anticline. The geomorphic history of the area began when it became land about 35 Ma ago. The Wahgi Valley contains volcanic debris avalanche and lahar deposits in the west and fluviatile/ lacustrine deposits elsewhere. The latter are dominated by undissected swamp and lake deposits in the west, and dissected fan and terrace deposits in the east. There is clear evidence of knick point retreat up the Wahgi River from the east, causing the fans to trench progressively from the east. Earlier interpretations of the evolution of the Wahgi Valley stressed drainage reorganisation, with reversal of a westerly flowing Wahgi River caused by damming by volcanics in the west, and capture in the east. Evidence from sediments, tephra, and landforms now suggests that reversal was probably restricted to the westernmost drainage, and any reversal of drainage occurred earlier than previously thought, perhaps 400 000 years ago.
Google map showing geographic bounding box with values North bound -4.7 East bound 145.62 West bound 142.54 South bound -7.89
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1987-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81224 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81224/

Keywords

GA Publication
Journal
PNG
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-4.7
East bound
145.62
West bound
142.54
South bound
-7.89

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

Metadata File Identifier

fae9173a-70a5-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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