Semakan semula litostratigrafi Formasi Singa dilakukan berdasarkan data-data baru yang diperoleh melalui kajian terbaru. Secara umumnya, Formasi Singa dominan dengan batu lumpur hitam yang berselang lapis dengan batu pasir nipis hingga sederhana tebal serta sedikit lapisan konglomerat. Kajian melibatkan analisis terhadap beberapa log sedimen yang telah direkodkan di lapangan. Kesemua log sedimen tersebut telah dikorelasikan untuk mendapatkan satu log komposit yang mewakili keseluruhan Formasi Singa. Berdasarkan kajian terperinci korelasi litologi yang dilakukan, cadangan litostratigrafi baru Formasi Singa mengandungi empat ahli iaitu Ahli Kentut, Ahli Ular, Ahli Selang dan Ahli Lembung. Ahli Kentut merupakan ahli yang paling tua diikuti dengan Ahli Ular, Ahli Selang dan Ahli Lembung. Ahli Ular di dalam Formasi Singa dianggap sebagai satu unit kekanta antara Ahli Kentut dengan Ahli Selang. Beberapa siri perubahan paras laut ditafsirkan sepanjang pengendapan batuan Formasi Singa dipercayai akibat daripada proses pencairan glasier yang menyebabkan paras laut meningkat dan pengendapan berterusan yang menyebabkan lembangan menjadi cetek dan paras laut menjadi rendah.
Geosite mapping of Pulau Ular was conducted using remote sensing which includes data from topographic maps, aerial photograph, and satellite image as well as a photographs made by a drone. A geomorphological map was generated by remote sensing analysis. The next step was field work/observation to produce a geological map. Field observation identified 10 sites and localities with important and significant geological and landscape features for an understanding of the geological formation of this island such as rock, fossil, sedimentary structure, tectonic structure and erosion feature. Using all this information a geosite map of Pulau Ular was constructed and can be used in conservation planning and geotourism development.
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