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Mae Long Formation
Stratigraphic range: Early Miocene (MN 4) ~
Type	Geological formation
Lithology
Primary	Sandstone
Location
Region	Lamphun Province
Country	Thailand
Extent	Li Basin

The Mae Long Formation in the Li Basin (also referred to as Li Mae Long) is a fossil site in Lamphun Province, Thailand. The fossils found are thought to date to the late Early Miocene, about 18 million years ago, corresponding to the European zone MN 4.

Fossil content

Mammals found at the site include:

Metatherians

• Siamoperadectes minutus

Lipotyphlans

• Hylomys engesseri
• Neotetracus butleri
• Thaiagymnura equilateralis
• Unidentified Erinaceidae, possibly Mioechinus
• Scapanulus lampounensis

Bats

• Unidentified species possibly belonging to Taphozous
• Unidentified species of Megaderma
• Hipposideros felix
• H. khengkao
• Rhinolophus yongyuthsi
• Unidentified species of Rhinolophoidea
• Ia lanna
• Rhizomops mengraii
• Unidentified species of Vespertilionidae

Treeshrews

• Tupaia miocenica

Primates

• ?Nycticebus linglom
• Tarsius thailandica

Rodents

• Ratufa maelongensis
• Unidentified species possibly belonging to Atlantoxerus
• Democricetodon kaonou
• Diatomys liensis
• Neocometes orientalis
• Potwarmus thailandicus
• Prokanisamys benjavuni
• Spanocricetodon janvieri

Carnivorans

• Two unidentified species

Proboscideans

• Unidentified species

Perissodactyls

• Unidentified species

Artiodactyls

• Conohyus sindiensis
• Siamotragulus haripounchai
• Stephanocemas rucha
• Unidentified species possibly belonging to Homoiodorcas

References

Bibliography

• Mein, P. and Ginsburg, L. 1997. Les mammifères du gisement miocène inférieur de Li Mae Long, Thaïlande : systématique, biostratigraphie et paléoenvironnement. Geodiversitas 19(4):783–844 (in French). Abstract in French and English