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Khabo Sandstone Formation
Click to display on map of the Ancient World at:
Khabo Sandstone Fm base reconstruction

Khabo Sandstone Fm

Period: 
Neogene

Age Interval: 
Middle-Late Miocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Pegu (Bago) Yoma-Sittaung Basin, Towards the north, SE of Monywa, [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 169-183]

[Figure: Map showing location of sub-basins of the Central Myanmar Basin (after Myint Thein and M. Maung 2017)]


Lithology and Thickness

Sandstone. A 1400 m thick unit of fine- to medium-grained, cross-bedded to plane-bedded, yellow to buff sandstones, with pockets of Cyrena and tidal structures with some thin gypsum layers in the middle part of the basin.

[Figure: (e) Large-scale planar cross-bedding in the Khabo Sandstone Formation, road-cut mile post 227/2, east side of Expressway (after Myint Thein and M. Maung 2017)]

[Figure: (c) Planar cross-bedded sandstone with mud drapes on foresets, Khabo Formation, mile post 226/3, east side of Expressway (after Myint Thein and M. Maung 2017)]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformable with Moza Fm

[Figure: (b)regressive sequence boundary (RSB) between the sand-bar facies of the Khabo Sandstone Fm (Upper Miocene) and mixed-flat (tidal-flat) facies of Moza Formation (Lower–Middle Miocene) (after Than et al., 2017)]

Upper contact

Unconformable with Irrawaddy Fm

[Figure: (a) Angular unconformity between Irrawaddy Formation (Upper Miocene–Pliocene) and Khabo Sandstone Fm (Upper Miocene) (after Than et al., 2017)]

Regional extent

This Fm is developed in Pegu (Bago) Yoma-Sittaung Basin (BYSB).

[Figure: a) Composite stratigraphic correlation of Myanmar Central Basins (after Than et al., 2017)]

[Figure: b) Stratigraphic correlation of Bago (Pegu) Yoma-Sittaung Basin (after Than et al., 2017)]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[97.36,26.84],[95.62,26.11],[94.83,24.64],[94.19,22.39],[94.3,20.38],[95.11,17.51],[96.41,17.81],[95.95,20.52],[95.51,22.18],[96.28,24.52],[96.96,24.26],[97.82,25.42],[97.36,26.84]]]]}}

Fossils

Towards the north, SE of Monywa, the Khabo Fm becomes terrestrial and carries a rich assemblage of Middle Miocene mammalian fauna including Prodeinotherium, Choerolophodon, Gomphotherium, Brachypotherium, Tetraconodon, Microbunodon, Sivameryx and Dorcatherium (Takai et al. 2006; Nwe Nwe San 2013).


Age 

Middle-Late Miocene

Age Span: 

    Beginning stage: 
Serravallian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
13.82

    Ending stage: 
Tortonian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
9.44

Depositional setting

Terrestrial environment.


Depositional pattern:  


Additional Information


Compiler:  

Myint Thein and Maung Maung (Myint Thein and Maung Maung The Eastern (Back-arc) Basin of Central Myanmar: Basement rocks, lithostratigraphic units, palaeocurrents, provenance and developmental history, Chapter 8 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 169-183)