Langkawi dropstones: outstanding glaciogenic sedimentological features in Malaysia

Mohd Shafeea Leman (2010) Langkawi dropstones: outstanding glaciogenic sedimentological features in Malaysia. In: Geological heritage of Malaysia: geoheritage conservation (1997-2009). Institut Alam Sekitar dan Pembangunan (LESTARI), Universiti Kebangsaan Malaysia, Bangi, Selangor, pp. 85-106. ISBN 9789675227370

Mudstone, siltstone and sandstone of the Singa Formation in the Langkawi Islands often contain pebbles of various size, shape and origin and whose parent rocks are alien to the geology of Langkawi Islands and the neighbouring area. Unlike clasts in other common pebble-bearing rocks, these pebbles are randomly distributed within fine-grained sedimentary rocks, occasionally exhibiting dropstone structures, thereby indicating they are of marine glacial origin, being dropped by rafting icebergs in the past. The pebbly mudstone, siltstone and sandstone are known as glacial marine diamictite. The presence of these dropstones implies that Langkawi Islands were once placed joined together with other continents such as Australia, India, Africa and Antartica in a supercontinent called Gondwanaland during late Carboniferous to early Permian time (about 280-300 m. y. ago).

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Abstract

Mudstone, siltstone and sandstone of the Singa Formation in the Langkawi Islands often contain pebbles of various size, shape and origin and whose parent rocks are alien to the geology of Langkawi Islands and the neighbouring area. Unlike clasts in other common pebble-bearing rocks, these pebbles are randomly distributed within fine-grained sedimentary rocks, occasionally exhibiting dropstone structures, thereby indicating they are of marine glacial origin, being dropped by rafting icebergs in the past. The pebbly mudstone, siltstone and sandstone are known as glacial marine diamictite. The presence of these dropstones implies that Langkawi Islands were once placed joined together with other continents such as Australia, India, Africa and Antartica in a supercontinent called Gondwanaland during late Carboniferous to early Permian time (about 280-300 m. y. ago).

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Item Type:	Book Section
Additional Information:	Available at Perpustakaan Sultan Abdul Samad, Universiti Putra Malaysia, 43000 UPM Serdang, Malaysia. QE299.5 G345 Call Number
AGROVOC Term:	sedimentology
AGROVOC Term:	geological history
AGROVOC Term:	natural heritage
AGROVOC Term:	surveying
AGROVOC Term:	analysis
AGROVOC Term:	geologists
AGROVOC Term:	preservation
AGROVOC Term:	sustainable agriculture
Geographical Term:	Malaysia
Depositing User:	Ms. Azariah Hashim
Date Deposited:	02 Dec 2024 08:50
Last Modified:	02 Dec 2024 08:50
URI:	http://webagris.upm.edu.my/id/eprint/999

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