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.
Fossil content The formation has provided fossil insects and trees:Bukachacha at Fossilworks.org
Coleoptera Coptoclavidae Stygeonectes jurassicusPonomarenko, 1990 Trichoptera Phryganeidae Proagrypnia sp.Sukatsheva, 2016, p.401 Ephemerida Hexagenitidae Ephemeropsis trisetalisSinitshenkova, 1990
Baierella sp. Pseudotorellia sp. Sphenobaiera sp. Araucariaceae indet. Cheirolepidiaceae indet. Cyatheaceae indet. Gleicheniaceae indet. Miroviaceae indet. Osmundaceae indet. Pinaceae indet. Schizaeaceae indet. Taxodiaceae indet.
See also List of fossiliferous stratigraphic units in Russia Batylykh Formation, contemporaneous fossiliferous formation of Buryatia
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