Sedimentary logs and facies characterization dataset of Tembeling group from the vicinity area of Kuala Tahan, Pahang, Malaysia

This sedimentary logging and facies characterized dataset of 28 outcrops exposed along Kuala Tahan – Kampung Pagi – Kampung Bantal which is situated in the central part of Peninsular Malaysia (in the state of Pahang). This dataset is recorded in 2017 during the construction of roadway. It consist of Mangking Formation of Tembeling Group with the total length of 410 m. The outcrops are arranged into 8 continuous sections. This data can be further correlated stratigraphically to produce composite log, facies analysis, depositional processes, and the depositional environment.


Specifications Table
The processed data has been deposited in the Mendeley repository and is accessible using the link: Repository name: Mendeley Data Direct URL to data: https://data.mendeley.com/datasets/3sz9g6nrc8/1

Value of the Data
• The outcrops and sedimentary logs can inspire researchers to conduct more advanced studies on sedimentology, facies analyses and depositional environment interpretation on Jurassic-Cretaceous rocks of the region.• The dataset can be stratigraphically correlated with the geology of Peninsula Malaysia, Thailand, and Indochina especially on the Jurassic-Cretaceous aged strata (red beds).• The outcrops/exposures are now inaccessible due to dense vegetation and cementing through rock/slope stabilization techniques.Other Jurassic-Cretaceous rocks in this region are difficult to access.

Data Description
In the Mendeley Data repository, there are 4 separate folders, namely, 1) Outcrop Details, 2) Compiled Sedimentary Logs, 3) Locality Map, and 4) Digitization Raw Files.Folder 1 (Outcrop Details) contains excel file with coordinates, bedding orientations (strike and dip) and note on structures (fault and folding).Sedimentary logs and outcrop photos are arranged in Folder 2 (Compiled Sedimentary Logs) based on section (Section 1 to 11) ( Figs. 2 and 3 ).The locality map in Folder 3 (Locality Map) is generated using ArcGIS R to show the locations of outcrops ( Table 1 ).
The locality of this dataset comprises the Jurassic -Cretaceous-aged rock unit from the Tembeling Group, namely the Mangking Formation.A N-S orientation boundary with Triassic aged Semantan Formation is reported westward.Other Jurassic -Cretaceous geological dataset of Peninsula Malaysia can be obtained from Khor et al. (2017) [1] .

(i) Sedimentary logging
The sedimentary characteristics recorded during field excursion are lithology, grain size, primary sedimentary structures, bedding, external geometry, fossils, thickness, grain size, and color based on Tucker (2011) [3] .Tools used in logging were hand lens, measuring tape, compass, and geological hammer.These details for each outcrop were then digitized using Adobe Illustrator R into sedimentary logs (refer Figs. 2 and 3 ).

(ii) Facies characterization
Detailed facies characterization were done using Miall (1996) [2] classification scheme.This classification uses abbreviations such as Sp, Sm, Fl, and Fm and are as listed in the table below ( Fig. 4 ) ( Table 2 ).Beds are classified into these abbreviations based on sedimentary characteristics, notably, bedding, grain size, texture, and sedimentary structures.

(iii) Locality Map
Outcrops were correlated into eight sedimentary sections based on their coordinates, orientation readings, and geological structures.. Coordinate readings of each outcrop were plot using ArcGis R ( Fig. 1 ).

Limitations
One common limitation of sedimentary logging is that some beds may not preserve the structures or features present in the original sedimentary deposit.This could be due to various factors such as post-depositional changes, erosion, bioturbation, and diagenesis (chemical and physical changes during burial), some sedimentary structures may be altered or completely obliterated.These structureless beds are recorded as Structureless Sandstone Facies (Sm).

Ethics Statement
This work did not involve studies with animals or human.The authors declare that they have no known competing financial interests or personal relationships which have or could be perceived to have influenced the work reported in this article.

Table 1
Summary of the characteristics features of the lithofacies types.