Warta Geologi, Vol. 47, No. 1, April 2021, pp. 29–48

Reconnaissance of Kenny Hill Formation outcrops in the Rawang
area, northern Selangor, Malaysia

Allan Filipov^1,*, John Jong², Mazlan
Madon³

¹ GFSI LLC, Kuala Lumpur, Malaysia

² JX Nippon and Gas Exploration (Malaysia)
Limited, KL, Malaysia

³ Department of Geology, Universiti Malaya, 50603
Kuala Lumpur, Malaysia

* Corresponding author email address: allan.filipov@yahoo.com

Abstract:
New outcrops of Paleozoic meta-sediments northwest of Kuala Lumpur expose
the deformational effects of the Late Paleozoic-Mesozoic collisions between
various Gondwana-derived continental fragments as they amalgamated to form the
core of SE Asia. Over a duration of 6 months, beginning in August 2020, we
conducted field trips within northern Selangor to new laterally extensive
outcrops for field observations, structural mapping and to measure and log the
stratigraphic section. This paper focuses on Upper Paleozoic Kenny Hill
Formation outcrops in northern Selangor. The most studied is the heavily
weathered Jalan Rawang-Bestari Jaya (JRBJ) outcrop, which is characterised by a
steeply dipping (southwest), upward-coarsening succession of sandstones and
shales interpreted as a system of ephemeral fluvial channels possibly related
to Gondwana glaciation. Concretions within bedding planes and fractures were
possibly formed around organic material. Less than 4 km to the east, the Scientex
development has excavated fresher outcrops of the same rocks dipping to the NE.
Metamorphic lineation is not present in either outcrop location. In addition, a
monocline is exposed at outcrop location number 3 nearby. Finally, at Bukit
Botak, 14 km to the southwest, a system of westward verging thrust faults, back
thrusts and normal faults can be viewed and an angular unconformity or
decollement marks the contact between the Upper and Lower Paleozoic. These laterally
extensive outcrops are rare and are quickly subject to intense tropical
weathering, the encroachment of jungle vegetation and urban development.
Historic mapping and prior stratigraphic, structural, and petrographic studies
have been conducted in the area, but these relied on poor exposures. As
suburban development escalates in the area, we hope that new outcrops,
featuring multi-dimensional views of these formations, such as the four
described in this paper, will complement the earlier work.

Keywords:
Upper Paleozoic, Kenny Hill Formation, Rawang

DOI : https://doi.org/10.7186/wg471202104

ISSN
0126–5539; e-ISSN 2682-7549