The Argun Formation is the name of geological formation, formed in Crimea and Chita, Russia. It formed in early Cretaceus, appeared around 125.45 - 122.46 Ma, and ended in Miocene, ~23.03 - 15.97 Ma. Its lithology is characterized as shale in Crimea and siliclastic in Pad Semen (near Chita).
Fossil content The formation contains mainly remains of fossil insects, mainly beetles:
Archeraphidia baisensis Acmaeoderimorpha emersa Antemnacrassa geminata Brochocoleus minor Cacopsylla agellialta C. lapidea C. popovi C. taurica Cretohexura coylei Cretobestiola communis Cretothyrea optanda Cretoglaphyrus olenguicus C. zherikhini C. calvescens C. leptopterus C. transbaikalicus Cretolucanus longus C. ordinarius C. sibericus Cionocoleus sibiricus Dolichoderus tavridus D. taurica D. tauricus Lithoscarabaeus baissensis Metabuprestium cuneomaculatum Myangadina tetrops Prototrox transbaikalicus Priacma striata Prosusumania semenica Proteroscarbaeus yeni Pamparaphilius semen Trematothorax ingodensis Zygadenia semen Z. sibirica Z. sinitzae Irenichthys sp. Archostemata indet. Cupedidae indet. Prototroginae indet.
See also Argun terrane
References