Tadushi locality (PIN collection 3364) (Eocene of Russian Federation)

Where: Primorsky Krai, Russian Federation (44.3° N, 135.3° E: paleocoordinates 47.5° N, 127.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tadushi Formation, Ypresian (56.0 - 47.8 Ma)

• The age of the Tadushi Formation is controversial. It is usually considered to be Paleocene: late Paleocene, possibly Thanetian (Rasnitsyn & Zherikhin, 2002); middle Paleocene (Selandian – earliest Thanetian) (Pavlyutkin & Petrenko, 2010); or even early Danian (Akhmetiev, 2010), based on its insects and flora. However, radiometric dating of volcanic rocks of the underlying Bogopol Formation and basalts of the overlaying Suvorovo Formation shows that the Tadushi Formation is Eocene. The age of samples from the Bogopol Formation determined by K-Ar dating within Zerkalnaya River valley are 48 Ma (vicinity of Bogopol Village: Bykovskaya et al., 1960) and 57±3 Ma (near Ustinovka quarry: Arakelyants et al., 1982). The age of upper horizons of this formation from nearby regions is thought to be late Paleocene to early Eocene, from 59.68 ± 1.59 to 52.92± 1.0 Ma by Rb-Sr dating (Popov & Grebennikov, 2001), and 52.6±1.3 Ma – 50.6±1.2 Ma by K-Ar dating (Otofuji et al., 1995). The age of basalts of the Suvorovo Formation is middle Eocene, from 41±3 Ma to 47.3±1.2 Ma (Arakelyants et al., 1982; Otofuji et al., 1995, 1998, 2002; Martynov, 1999). Basalts of the Suvorovo Formation conformably overlay the Tadushi Formation, whereas the latter rests unconformably on volcanic rocks of the Bogopol Formation, at least on the left bank of the Kurchumka River, probably in the vicinity of the village of Suvorovo (Mikhailov et al., 1989). Therefore, a late early Eocene age of the Tadushi Formation is most probable (see also Popov & Grebennikov, 2001).

Environment/lithology: lacustrine; tuffaceous mudstone

Size classes: macrofossils, mesofossils

Preservation: adpression

Reposited in the PIN

Primary reference: A. G. Ponomarenko and A. P. Rasnitsyn. 1974. New Mesozoic and Cenozoic Protomecoptera. Paleontological Journal 8:493-507 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123616: authorized by Matthew Clapham, entered by Jered Karr on 26.01.2012, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hymenoptera - Ichneumonidae
Crusopimpla tadushiensis n. gen. n. sp.4 Kopylov et al. 2018 ichneumon wasp
PIN 3364/277, 41
? Dolichomitus saxeus n. sp.4 Kopylov et al. 2018 ichneumon wasp
PIN 3364/31
 Coleoptera - Brentidae
Cretotanaos bontsaganensis n. gen. n. sp.5 Legalov 2014 weevil
PIN 3364/266, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 267, 268, 269, 270, 271, 273, 274, 275, 276
 Mecoptera - Eomeropidae
? Eomerope sp.2 Cockerell 1909 scorpionfly
PIN 3364/2383
Eomerope asiatica n. sp. Ponomarenko 1974 scorpionfly
PIN 3364/2381, 2374, 2375, 2376, 2377, 2378, 2380, 2384, 2387
 Mecoptera - Dinopanorpidae
Dinopanorpa sp.1 Cockerell 1925 scorpionfly
"Zherikhin (1978) reported (but did not figure) a new, undescribed species of Dinopanorpa"
 Diptera - Mycetophilidae
Exechiites tadushensis n. sp.3 Blagoderov 2000 fungus gnat
PIN 3364/3687
Mycomyites tadushensis n. sp.3 Blagoderov 2000 fungus gnat
PIN 3364/3603
 Neuroptera - Chrysopidae
Asiachrysa tadushiella n. gen. n. sp.6
Asiachrysa tadushiella n. gen. n. sp.6 Makarkin 2014 green lacewing
PIN 3364/3755