showed the sediment distribution of the gulf, but they consideredthat the amount of calcium carbonate was too low to affect thegrain size parameters in the gulf of Thailand and thus analyzedthe whole sample with calcium carbonate. However, the UGOT is abundant in shell fragments, which are calcium carbonate-rich andare significant in determining the grain size composition of sedi-ments (Fig. 3B). The total sediment color in the study of Emeryand Niino also show that samples near the Chao Phraya Rivermouth is yellow brown, whereas the adjacent bank is olive brown.The averaged Mz of sediments collected from the Chao PhrayaRiver and Bang Pakong River is <30 lm, whereas the Mz fromthe Mae Klong River and Tha Chin River is >55 lm (Fig. 3B).
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