The Barail Group has generally been regarded as being of
Oligocene age, and was deposited during basin-wide emergence in a
major marine regression (Shamsuddin and Abdullah, 1997; Uddin and
Lundberg, 1998). However, Najman et al. (2008)noted that the
Oligocene age assigned to the Barail Group was constrained only by
the biostratigraphy of the underlying and overlying units, and
proposed a Late Eocene–Early Miocene age based on new biostratigraphic and isotopic data. That revised age is adopted here. The Barail
Group (Jenam and Renji Formations) consists of medium tofinegrained sandstones with alternating siltstones and mudstones. Jenam
rocks are mainly siltstones, silty mudstones, and sandstones (Khan,
1978), whereas the Renji Formation consists of fine-grained sandstones alternating with siltstones, and calcareous and carbonaceous
mudstones containing a few coal lenses (Reimann, 1993).
The Barail Group has generally been regarded as being of
Oligocene age, and was deposited during basin-wide emergence in a
major marine regression (Shamsuddin and Abdullah, 1997; Uddin and
Lundberg, 1998). However, Najman et al. (2008)noted that the
Oligocene age assigned to the Barail Group was constrained only by
the biostratigraphy of the underlying and overlying units, and
proposed a Late Eocene–Early Miocene age based on new biostratigraphic and isotopic data. That revised age is adopted here. The Barail
Group (Jenam and Renji Formations) consists of medium tofinegrained sandstones with alternating siltstones and mudstones. Jenam
rocks are mainly siltstones, silty mudstones, and sandstones (Khan,
1978), whereas the Renji Formation consists of fine-grained sandstones alternating with siltstones, and calcareous and carbonaceous
mudstones containing a few coal lenses (Reimann, 1993).
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