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Mae Ramat Formation

Mae Ramat Fm

Period:

Paleogene

Age Interval:

Late Oligocene (5)

Province:
Sibumasu: Western Region

Type Locality and Naming

Mat Sot Basin; Mae Sot district, Tak province. This basin lies on the Myanmar border and is bounded on its north by the Mae Ping Fault.. Lower-middle unit in the Mae Sot Gr.

Synonym: หมวดหินแม่ระมาด

Lithology and Thickness

Stratigraphy at Mae Tun coalfield at Mae Ramat in the northern part of the basin. "Ratanasthien (1990) describes the coals as being of Late Eocene–Early Oligocene age, unconformably overlain by Upper Oligocene–Lower Miocene strata. Flooding has now made those units inaccessible and the oldest beds now visible comprise the Mae Ramat Fm which, according to Ratanasthien (1990), comprises 240 – 600 m of alluvial sandstone, conglomerate and green, grey and red mudstone. " (Morley & Racey, 2011).

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Unconformable on Mae Tun coalfield coal unit (Late Eocene-Early Oligocene). Next older regional unit is the Umphang Gr (Lu Kloc Tu Fm) of Jurassic.

Upper contact

Overlain by the Mae Pa Fm

Regional extent

Mat Sot Basin on the Myanmar border and is bounded on its north by the Mae Ping Fault.

GeoJSON

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Fossils

Paleogene plant fossils have been collected including Ficus sp., Alangium sp., Magnolia sp., Persia sp., Sassafras cf. subtrilobata and Leguminositis sp..

Age

Implied to be late Oligocene (lower part of the Upper Oligocene–Lower Miocene interval)

Age Span:

Beginning stage:

Chattian

Fraction up in beginning stage:

0.1

Beginning date (Ma):

27.58

Ending stage:

Aquitanian

Fraction up in the ending stage:

0.0

Ending date (Ma):

23.04

Depositional setting

Alluvial fan, alluvial plain

Depositional pattern:

Additional Information

Compiler:

Modified from Christopher K. Morley & Andrew Racey, 2011, Chapter 10 Tertiary stratigraphy in: Ridd, M.F., Barber, A.J., and Grow, M.J., editors, The Geology of Thailand, Geol. Soc. of London. And modified from- Lexicon of Stratigraphic Names of Thailand of 2013