/* Style Definitions */table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin:0cm;mso-para-margin-bottom:.0001pt;mso-pagination:widow-orphan;font-size:10.0pt;font-family:"Calibri","sans-serif";} Bulletin of the Geological Society of Malaysia, Volume 59, November 2013, pp. 47 – 51
Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi,
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor
Abstrak: Lapisan perantaraan Formasi Kubang Pasu dan Formasi Chuping tersingkap di kawasan Beseri, Perlis. Hasil daripada cerapan di lapangan dan kajian terperinci di Kuari B, empat fasies sedimen telah dikenalpasti iaitu selang lapis batu pasir dan lumpur nipis, batu lumpur tebal, batu pasir berpelapisan tebal dengan sedikit lumpur dan batu pasir yang terbioturbasi. Secara keseluruhan, jenis litologi yang secara umumnya berbutir halus dan semakin berkalka ke atas jujukan ini menunjukkan sekitaran pengendapan di dalam laut cetek. Analisis jujukan pula mendapati terdapat dua jenis jujukan batuan iaitu jujukan mengkasar ke atas yang menandakan proses pengendapan di dalam sekitaran maraan garis pantai dan jujukan yang menghalus ke atas yang menandakan endapan di dalam sekitaran alur. Perulangan jujukan mengkasar dan menghalus ke atas ini menunjukkan terdapatnya kemungkinan bahawa lapisan perantaraan formasi ini terendap di dalam fasa regresi di dalam sekitaran pasang surut dan pelantar benua.
Abstract: The Passage beds between the Kubang Pasu Formation and Chuping Formation crops out in Beseri, Perlis. A detailed sedimentological study was carried out at Quarry B from which four facies have been identified. These facies are sandstone interbedded with thin mudstone beds facies, thickly-bedded mudstone, thickly-bedded sandstone with thin mud and bioturbated sandstone. In general the sequence is fine-grained with increasing calcareous content towards the upper part of the Passage beds showing evidence that these facies were deposited in a shallow marine environment. Meanwhile, the relationships among these facies show that there are two trends which can be differentiated by its lithological pattern. There are coarsening upwards trends which indicate depositional that took place on regressing shoreline environment and also fining upwards trend showing that deposition happened otherwise. The recurrence of these sequences overlapping each other indicates a third order regressive and transgressive phase which may take place in the shallow marine environment.
Keywords: sedimentology, Passage beds, regression, continental shelf
https://doi.org/10.7186/bgsm59201308
