Langkawi UNESCO Global Geopark, located in the far northwestern corner of Peninsular Malaysia in the state of Kedah, spans an impressive area of approximately 478 square kilometers of land and, including water bodies, covers a total area of 920 square kilometers. It is renowned for its rich geological heritage and stunning natural landscapes, pristine ecosystems, and cultural heritage. Established on 1st June 2007, it holds the distinction of being Southeast Asia’s first UNESCO Global Geopark .
Langkawi archipelago boasts the oldest and most complete Palaeozoic (540 million to 250 million years ago) geological record in the region. Since the early Cambrian period, Langkawi has undergone various geological processes, within different environments, resulting in numerous types of sedimentary rocks with interesting and unique structures, and containing a likewise variegated assortment of fossil types.
The first major depositional event took place in a shallow marine deltaic and fluvio-marine environment believed to be what was once part of the continental shelf of the supercontinent Gondwanaland. This deposition, dominated by sandstones, is known as the Machinchang Formation. Following these deltaic deposits, there was a period of marine transgression that caused the deposition of calcium carbonate-rich sediments. These lithified into shallow to deep marine limestones, Setul’s Lower Detrital Member, during the Ordovician and Silurian. This was followed by marine regression, seen today in the Upper Detrital Member, which shows shallow marine limestones. There was then a short period of no deposition in the Middle Devonian, followed by the deposition of the basal redbeds, then mud and siltstones of the Singa Formation.
These all show the influence of polar glaciation and melting with the appearance of dropstones and cold-water fossils. During the Permian, Langkawi and its Sibumasu Terrane broke away from Gondwanaland and drifted north to warmer latitudes, which led to the deposition of the tropical Chuping Limestone.
The Sibumasu Terrane drifted until it collided with Indochina, causing the deposited and lithified sedimentary rocks to be subject to major tectonic movement, resulting in faults and folds throughout the region. Concurrently, magma was emplaced in various granite bodies. This tectonic episode, through uplift, brought Langkawi to the surface from beneath the ocean, resulting in the rocks undergoing continuous erosion, creating the unique geological landscape we see.
