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Panlaung Formation
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Panlaung Fm base reconstruction

Panlaung Fm

Period: 
Jurassic, Cretaceous

Age Interval: 
Middle Jurassic–Early Cretaceous


Province: 
Myanmar Shan Region

Type Locality and Naming

Shan mid-Plateau (Pyin Oo Lwin). The Panlaung Fm was first described by Garson et al. (1976). [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 143-167]


Lithology and Thickness

Sandy claystone. First described by Garson et al. (1976) as an alternating sand and shale sequence. However, later investigation of the Panlaung Fm reveals a wide range of lithologies such as red beds, turbidites and allochemical limestone facies (Myint Thein & Bo San 1984; Myint Thein 2004).


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unconformable with Plateau Limestone Gr

Upper contact

Conformable contact with Alluvium.

Regional extent

This Fm is developed in Shan mid-Plateau (Pyin Oo Lwin).


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[97.03,21.59],[96.38,21.48],[96.24,21.21],[96.37,21],[96.63,20.92],[97.31,21.05],[97.51,21.25],[97.08,21.59],[97.03,21.59]]]]}}

Fossils

containing abundant fossils: foraminifera: Pseudocyclammina, Caskizolinoides, Lucanzella, Ammobaculites, Gaudryna, Nautiloculina, Givanella and Cordiacian; algae: Halimeda Algal Oncolites (Turbiphytes) and Oligostegina; gastropoda: Narenea and Narinella; corals: Montivaltia and Peresphinctid ammonites.


Age 

The above fossils indicate that the Panlaung Fm is of Middle Jurassic–Early Cretaceous age.

Age Span: 

    Beginning stage: 
Aalenian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
174.70

    Ending stage: 
Berriasian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
137.70

Depositional setting

Shallow-marine environment


Depositional pattern:  


Additional Information


Compiler:  

Naing Maw Than, Kyi Khin & Myint Thein (Than et al., Cretaceous geology of Myanmar and Cenozoic geology in the Central Myanmar Basin, Chapter 7 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 143-167).