Setul Limestone in Langgun Island and Perlis are lack of sedimentary structures, which makes it difficult for paleoenvironmental study in the study area. The present study of limestone succession at Kaki Bukit and Teluk Mempelam area focuses on microbial related structure in order to constraint its depositional setting. The structures were identified as stromatolites and thrombolites, which resulted from the interaction of microbial with sediments by trapping, binding and/or precipitation of minerals. Both structures can be distinguished based on four main classifications, the megastructure, macrostructure, mesostructure and microstructure scales. These classifications assist in understanding its physical natures and lead to the recognition of paleoenvironment in the study area which is believed to be controlled by several factors such as environment, hydrodynamic, biological and chemical processes.

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