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
Insecta | |
Asiachrysa tadushiella n. gen. n. sp.6
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Cretotanaos bontsaganensis n. gen. n. sp.5
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
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Eomerope asiatica n. sp. Ponomarenko 1974 scorpionfly PIN 3364/2381, 2374, 2375, 2376, 2377, 2378, 2380, 2384, 2387
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Dinopanorpa sp.1 Cockerell 1925 scorpionfly "Zherikhin (1978) reported (but did not figure) a new, undescribed species of Dinopanorpa"
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