Liutiaogou Village, Dashuangmiao Town (CNU collection) (Cretaceous of China)

Where: Nei Mongol, China (41.5° N, 118.9° E: paleocoordinates 43.8° N, 121.0° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Yixian Formation (Jehol Group), Late/Upper Barremian (130.0 - 125.5 Ma)

• The Yixian Formation can be subdivided into five units, in ascending order, Lujiatun unit, Lower Lava, Jianshangou unit, Upper Lava, Dawangzhangzi unit, Jingangshan unit, and Huanghuashan unit. Most of the Jehol fossils from the Yixian Formation are preserved in four beds, that is, the Lujiatun bed (recalculated age is 124.0 ± 1.0/1.3 Ma, He et al., 2006), the Jianshangou bed (125.43 ± 0.50/0.88 Ma, Swisher et al., 1999), the Dawangzhangzi bed, and Jinggangshan bed (~122 Ma, Smith et al., 1995).U-Pb dating suggests that the Huangbanjigou section ranges from 124.9 ± 1.7 Ma to 122.8 ± 1.6 Ma (Yang et al., 2007). Chang et al. (2017) obtained Ar/Ar ages of 125.8 ± 1.0 Ma and 126.0 ± 0.8 Ma from the Lujiatun Unit, the lowest part of the Yixian Formation, below the lacustrine shales.

•He et al. (2004) reported a 40Ar/39Ar age of 120.3 ± 0.7 Ma for a tuff layer in the lower part of the Jiufotang Formation, and Chang et al. (2009) obtained a 40Ar/39Ar age of 122.1 ± 0.3 Ma for a tuff layer from the lowermost part of the Jiufotang Formation. Yu et al. (2021) dated an ash bed just above the Yixian/Jiufotang formation boundary to 122.0 ± 0.9 Ma and three tuff beds from the Xiaotaizi section to 118.9 ± 0.8 Ma, 118.8 ± 0.6 Ma, and 118.6 ± 1.1 Ma. These ages suggest that the Jiufotang Formation in Jianchang Basin was deposited at ca. 122.0–118.9 Ma.

•Olierrok et al. (2019) used a selection of U-Pb and 40Ar-39Ar geochronology to place the Barremian–Aptian boundary (the base of the Chron M0r) between 123.8 and 121.8 Ma. The GTS 2020 uses an age of 121.4 Ma for the base of the Aptian, and multiproxy orbital tuning gives an age of 120.2 Ma for the Barremian-Aptian boundary (Leandro et al., 2022). Therefore, the Yixian Formation should be entirely Late Barremian, with the Jiufotang Formation deposited in the Early Aptian (or latest Barremian at its base).

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, tuffaceous mudstone

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: Material at Capital Normal University, Beijing

Primary reference: B. L. Zhang, D. Ren, and H. Pang. 2008. New dragonflies (Insecta: Odonata: Gomphaeschnidae) from the Yixian Formation in Inner Mongolia, China. Progress in Natural Science 18:59-64 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 125656: authorized by Matthew Clapham, entered by Matthew Clapham on 15.03.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Odonata - Progobiaeshnidae
Mongoliaeshna exiguusens n. sp.4 Li et al. 2012 true dragonfly
CNU-ODO-NN2011002
Mongoliaeshna hadrens n. sp.4 Li et al. 2012 true dragonfly
CNU-ODO-NN2011001
 Odonata - Gomphaeschnidae
Sophoaeschna frigida n. gen. n. sp., Falsisophoaeschna generalis n. gen. n. sp.
Sophoaeschna frigida n. gen. n. sp. Zhang et al. 2008 true dragonfly
CNU-OD-NN2004015
Falsisophoaeschna generalis n. gen. n. sp. Zhang et al. 2008 true dragonfly
CNUOD- NN2004065-1,2 Part and Counter Part
 Hymenoptera - Ephialtitidae
Acephialtitia colossa n. gen. n. sp.5
Acephialtitia colossa n. gen. n. sp.5 Li et al. 2015 wasp
CNU-HYM-LB2013004
 Mecoptera - Cimbrophlebiidae
Cimbrophlebia rara n. sp.11 Wang et al. 2014 hangingfly
CNU-MEC-NN2011100
 Neuroptera - Nymphidae
Sialium sinicus n. sp.7 Shi et al. 2015 split-footed lacewing
CNU-NEU-NN2014002
Baissoleon similis n. sp.7 Shi et al. 2015 split-footed lacewing
CNU-NEU-NN2014001
"Nymphites" "sp. B"7 Haase 1890 split-footed lacewing
CNU-NEU-NN2014003
 Neuroptera - Kalligrammatidae
Oregramma sp.15 Ren 2003 lacewing
CNU-NEU-NN2010014
Oregramma aureolusa n. sp.15 Yang et al. 2014 lacewing
CNU-NEU-NN2009032
Ithigramma sp.15 Yang et al. 2014 lacewing
CNU-NEU-NN2010016
Ithigramma multinervia n. gen. n. sp.15 Yang et al. 2014 lacewing
CNU-NEU-NN2009034
 Coleoptera - Staphylinidae
Thayeralinus glandulifer n. sp.8 Solodovnikov and Yue 2013 rove beetle
CNU-COL-NN2008231
Thayeralinus giganteus n. sp.8 Solodovnikov and Yue 2013 rove beetle
CNU-COL-NN2009253
Paleowinus mirabilis n. sp.8 Solodovnikov and Yue 2013 rove beetle
CNU-COL-NN2008069
Paleowinus fossilis n. sp.8 Solodovnikov and Yue 2013 rove beetle
CNU-COL-NN2008175
Paleowinus chinensis n. sp.8 Solodovnikov and Yue 2013 rove beetle
CNU-COL-NN2008240
 Coleoptera - Scarabaeidae
Antiqusolidus maculatus n. gen. n. sp.6
Antiqusolidus maculatus n. gen. n. sp.6 Lu et al. 2023 scarab beetle
CNU-COL-NN2011001
 Coleoptera - Glaphyridae
Cretohypna robusta n. sp.19, Cretohypna cristata n. gen. n. sp.13, Cretohypna puncta n. sp.19
Cretohypna robusta n. sp.19 Zhao et al. 2016 bumble bee scarab beetle
CNU-COL-NN2014001
Cretohypna cristata n. gen. n. sp.13 Yan et al. 2012 bumble bee scarab beetle
CNU-COL-NN2011003
Cretohypna puncta n. sp.19 Zhao et al. 2016 bumble bee scarab beetle
CNU-COL-NN2014002, 003, 004
 Coleoptera - Hybosoridae
Pulcherhybosorus tridentatus n. gen. n. sp.12 Yan et al. 2012 scavenger scarab beetle
CNU-COL-NN2011002
 Coleoptera - Buprestidae
Trapezitergum grande n. gen. n. sp.17
Trapezitergum grande n. gen. n. sp.17 Yu et al. 2013 jewel beetle
CNU-COL-NN2010411
 Coleoptera - Dascillidae
Cretodascillus sinensis n. gen. n. sp.3
Cretodascillus sinensis n. gen. n. sp.3 Jin et al. 2013 soft bodied plant beetle
CNU-COL-LB2010330
 Hemiptera - Kobdocoridae
Halonatusivena nervosus1 Du et al. 2016 true bug
CNU-HE-NN2010215
 Hemiptera - Torrirostratidae
Torrirostratus pilosus16 Yao et al. 2014 true bug
CNU-Het-IN2010173
Flexicorpus acutirostratus16 Yao et al. 2014 true bug
CNU-Het-IN2010081, 173 (not sure if two "173" specimens are different)
 Orthoptera - Elcanidae
Probaisselcana minuta n. sp.2 Gu et al. 2022 grasshopper
CNU-ORT-NL2016073, 055, 047
Probaisselcana euryptera n. sp.9 Tian et al. 2019 grasshopper
CNU-ORT-NL2011035, 2016048
 Dicondylia - Chresmodidae
Sinochresmoda magnicornia n. gen. n. sp.18
Sinochresmoda magnicornia n. gen. n. sp.18 Zhang et al. 2008 winged insect
CNU-CH-NN2007001-006
 Dicondylia - Magicivenidae
Magicivena sp.14 Yang et al. 2022 winged insect
CNU-NL2013104
 Dicondylia - Susumaniidae
Cretophasmomima melanogramma n. sp.10 Wang et al. 2014 winged insect
CNU-PHA-NN2012002, 001, 003