Bukachacha Formation

The Bukachacha Formation is a geological formation in Zabaykalsky Krai, Russia dating to the Early Cretaceous (Barremian). The tuffaceous mudstones of the formation were deposited in a lacustrine environment.

Bukachacha Formation
Stratigraphic range: Barremian ~129–125 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Mudstone
Other	Tuff
Location
Coordinates	53.0°N 116.9°E / 53.0; 116.9
Approximate paleocoordinates	56.7°N 114.9°E / 56.7; 114.9
Region	Zabaykalsky Krai
Country	Russia
Type section
Named for	Bukachacha
Bukachacha Formation (Russia)

Fossil content

The formation has provided fossil insects:^[1]

• Coleoptera
  • Coptoclavidae
    • Stygeonectes jurassicus^[2]
• Trichoptera
  • Phryganeidae
    • Proagrypnia sp.^[3]
• Ephemerida
  • Hexagenitidae
    • Ephemeropsis trisetalis^[4]

See also

• List of fossiliferous stratigraphic units in Russia
• Batylykh Formation, contemporaneous fossiliferous formation of Buryatia