Baissa (PIN collection 1989, layer 19): Aptian, Russian Federation

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Insecta - Neuroptera - Chrysopidae
2 specimens
PIN 1989/29,33 (1 measurement)
2 specimens
PIN 1989/32,41
Insecta - Neuroptera - Berothidae
Makarkin 1999 1 specimen
PIN 1989/36 (1 measurement)
Insecta - Diptera - Ironomyiidae
Mostovski 1995 1 specimen
PIN 1989/3394
Insecta - Hymenoptera - Braconidae
Rasnitsyn and Sharkey 1988 1 specimen
PIN 1989/3523
Insecta - Hemiptera - Mimarachnidae
Shcherbakov 2007 1 specimen
PIN 1989/3575
Shcherbakov 2007 1 specimen
PIN 1989/3336(3339)
Insecta - Hemiptera - Palaeoaphididae
Kania and Wegierek 2008 2 specimens
PIN 1989/3363, 3562
Kania and Wegierek 2008 1 specimen
PIN 1989/3574
Insecta - Permopsocida - Archipsyllidae
Vishnyakova 1976 1 specimen
PIN 1989/3564 (1 measurement)
see common names

Geography
Country:Russian Federation State/province:Buryatia
Coordinates: 53.3° North, 112.1° East (view map)
Paleocoordinates:50.9° North, 119.4° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Aptian 10 m.y. bin: Cretaceous 3
Key time interval: Aptian
Age range of interval: 121.4 - 113.2 m.y. ago
Stratigraphy
Formation:Zaza
Stratigraphic resolution:group of beds
Stratigraphy comments: C. longipoda, E. trisetalis and Lycoptera all occur in the Zaza Formation indicating that this formation could be correlated with the upper Yixian Formation and the lower Jiufotang Formation in western Liaoning, which have a duration of 122.5-120 Ma. So it is possible to assign the Zaza Formation to an Aptian age. Also correlated with Barremian-Aptian based on plants and pollen.
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: lithified marl
Environment:lacustrine - large Tectonic setting:rift
Geology comments: "The water body is reconstructed as an intermontane lake with the depth of 20 - 30 meters (LYAMINA 1980) situated within a granite massif. The presence of thick layers of the bituminous shales shows that the lake was meromictic, with the oxygen deficiency and high hydrogen sulphur level in the hypolimnion. However, the oxygenated epilimnion should be thick, with a lower boundary well beneath the limit of episodic wave action because no suffocation events are documented. The abundance of caddisflies, dobsonfly larvae and other groups intolerant to oxygen deficiency shows that in more shallow areas the water was clear and well-oxygenated even near the bottom. The lake ecosystem was highly productive as indicated by its complex trophic structure (Fig. 2) with several levels of predators up to the large sturgeon-like fish Stychopterus as well as by the extremely high abundance of planetonivorous phantom midges (SINICHENKOVA & ZHERIKHIN 1996)." ZHERIKHIN et al., 1999
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Collection size:3632 specimens
Reason for describing collection:taxonomic analysis
Metadata
Database number:122548
Authorizer:M. Clapham Enterer:M. Clapham, J. Karr
Modifier:M. Clapham Research group:paleoentomology
Created:2012-01-03 03:58:49 Last modified:2025-02-22 15:12:02
Access level:the public Released:2012-01-03 03:58:49
Creative Commons license:CC0
Reference information

Primary reference:
39068. V. N. Makarkin. 1997. Fossil Neuroptera of the Lower Cretaceous of Baisa, east Siberia. Part 3. Chrysopidae (Insecta). Spixiana 20:107-118 [M. Clapham/M. Clapham]

Secondary references:

48084 I. Kania and P. Wegierek. 2008. Palaeoaphididae (Hemiptera, Sternorrhyncha) from Lower Cretaceous Baissa deposits: Morphology and classification. Monografie faunistyczne 25:1-135 [M. Clapham/J. Karr]
50233 V. N. Makarkin. 1999. Fossil Neuroptera from the Lower Cretaceous of Baisa, east Siberia. Part 6. Mesithonidae (Insecta). Neues Jahrbuch für Geologie und Paläontologie, Monatshefte 1999(12):705-712 [M. Clapham/M. Clapham/M. Clapham]
40861 M. B. Mostovski. 1995. New taxa of Ironomyiidae (Diptera, Phoromorpha) from the Cretaceous of Siberia and Mongolia. Paleontological Journal 30:318-331 [M. Clapham/M. Clapham/M. Clapham]
44480 A. P. Rasnitsyn and M. Sharkey. 1988. New Eoichneumonidae from Early Cretaceous of Siberia and Mongolia (Hymenoptera: Ichneumonoidea). In V. K. Gupta (ed.), Advances in Parasitic Hymenoptera Research 169-197 [M. Clapham/M. Clapham]
46890 D. E. Shcherbakov. 2007. Mesozoic spider mimics — Cretaceous Mimarachnidae fam. n. (Homoptera: Fulgoroidea). Russian Entomological Journal 16(3):259-264 [M. Clapham/J. Karr]
40219 V. N. Vishnyakova. 1976. Relict Archipsyllidae (Insecta, Psocoptera) in the Mesozoic fauna. Paleontological Journal 10:180-188 [M. Clapham/M. Clapham]