Li Mae Long

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.^[1]

Mae Long Formation
Stratigraphic range: Early Miocene (MN 4) ~18 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Sandstone
Location
Region	Lamphun Province
Country	Thailand
Extent	Li Basin

Fossil content

Mammals found at the site include:^[1]

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