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- Title
Habitat and C-14 ages of lignitic terrace deposits along the northern Sarawak Coastline.
- Authors
KESSLER, FRANZ L.; JONG, JOHN
- Abstract
The young terraces fringing the Miri coastline from Miri to Bekenu are formed by lignitic sands, fossil wood, and conglomeratic beds that contain reworked quartz pebbles derived from the older Tukau Formation. The sequence can be subdivided into four sub-units: I. Basal Conglomerate, II. Sandstone with fossil wood and Ophiomorpha, III. Crossbedded lignitic sandstone, and IV. Bleached and weathered palaeosol. These sediments are indicative of a transgressive near-shore, fluvial to marginal marine depositional environment, as water energy peaked in cross-bedded sandstone of Subunit III. Radiometric C-14 based age determination in ten coastal locations indicates an age range from Late Pleistocene to Early Holocene (28,570 ± 230 to 8,170 ± 50 years BP). Given the terraces were formed in the same environment, but are now located at different elevations and appear to be block-faulted, it might imply significant tectonic movements in the Holocene.
- Subjects
BORNEO; TERRACES (Geology); QUATERNARY paleontology; PLEISTOCENE Epoch; HOLOCENE Epoch; OPHIOMORPHA
- Publication
Bulletin of the Geological Society of Malaysia, 2014, Vol 60, p27
- ISSN
0126-6187
- Publication type
Article
- DOI
10.7186/bgsm60201403