The Sao Khua Formation is a middle member of the Khorat Group. It consists of an alteration of grayish-reddish brown siltstone and clay, and pale red to yellowish-gray, fine to medium-grained sandstone. Rare pale red to light gray conglomerates, containing carbonate pebbles, are also characteristic of this Formation. This geological formation in Thailand, dates to the Early Cretaceous

Early Cretaceous

The Early Cretaceous or the Lower Cretaceous , is the earlier or lower of the two major divisions of the Cretaceous...

 age. Dinosaur remains are among the fossils that have been recovered from the formation.

Vertebrate paleofauna

Dinosaurs

• Siamosaurus suteethorni
  Siamosaurus
  Siamosaurus is a genus of theropod dinosaur from Early Cretaceous Thailand. The size of the animal is unknown, but it may have reached a length of about 9.1 meters . The type species, Siamosaurus suteethorni, was formally described by Buffetaut and Ingavat in 1986...
  
  - spinosaurid theropod, described in 1986 - "Isolated teeth." - Spinosauridae Incertae Sedis
• Siamotyrannus isanensis
  Siamotyrannus
  Siamotyrannus is a genus of theropod dinosaur from the early Cretaceous . It is known from a partial skeleton which includes part of the pelvis, the sacrum, and a number of vertebrae. The fossils were found in 1993 by Somchai Traimwichanon in the Sao Khua Formation of northeastern Thailand...
  
  - Carnosaur theropod, described in 1996 - "Pelvis, dorsal, sacral, and caudal vertebrae."
• Phuwiangosaurus sirindhornae - titanosaurian sauropod, described in 1994 - "Partial skeletons, juvenile - adult."
• Kinnareemimus khonkaenensis - ornithomimosaurian theropod, described in 2009
• Theropoda indet. (= compsognathid indet.)
• Sauropoda indet. 1 e 2