Section of Zhangjiagou Gate, Huodoushan Township, Luanping Basin, Northern Hebei Province
The Zhangjiagoumen section of Huodoushan Township in the Luanping Basin in northern Hebei was selected as the stratotype section of the Yixian stage boundary line. The work was completed by Liu Yongqing, Pang Qiqing, Niu Shaowu, etc. (2001, 2002, 2003). The profile consists of three profiles: Shangying, Xiaying and Yushuxia of Zhangjiagoumen Village (Figure 2-2-18). From top to bottom:
Shangying profile of Zhangjiagoumen Village:
The overlying formation is the Xiguayuan Formation of the Yixian Formation: gray-white and gray-brown massive boulders interspersed with thin to medium-thick layers of yellow-green gravelly fine sandstone, forming a rhythm.
The middle and upper part of the Dadianzi Formation of the Yixian Formation (equivalent to the 3rd and 4th members of the original Dadianzi Formation): 425.73 m
Figure 2-2-18 Luanping Basin in northern Hebei Stage boundary stratotype in Menyi County, Zhangjiagou, Huodoushan Township (Shangying, Xiaying and Yushu lower sections)
34. Grey-brown, gray mudstone, shale, interspersed with several layers of marl lenses body or thin layer. Produces fish; ostracods: Cypridea sulcata, C.spatiosa; leaf limbs: Jiliaoestheria striaris, Eosestheria sp., Diesthe-ria sp., Yanjiestheria (Yanshania) sp.18.96 m
33. Dark gray Shale, sandwiched by 4 to 5 thin layers or lenses of marl 50 to 80 cm thick. Ostracods in the middle: Cypridea spatiosa, C.chengdeensis, Yanshanina dabeigouensis, Y.elongata, Darwinula dadianziensis, etc.; leaf limbs: Jiliaoestheria striaris, Yanjiestheria (Yanshania) dabeigouensis, Y. (Y.) subquadrata 12.06 m
32. Dark gray shale, interspersed with a small amount of 10 cm thick marl layers or lenses. The marl layers increase upward and become thicker, up to 1 m thick. Fish at the top: Lycoptera sp.; leaf limbs: Jiliaoestheria striaris, Eosestheria (Clithrograpta) lingyuanensis, Diestheria sp.14.59 m
31. Gray mud shale and medium thin layer (or lens) marl Interbedded rock and fine sandstone. Ostracods produced; leaf limbs: Jil-iaoestheria striaris, Yanjiestheria (Yanshania) dabeigouensis, Eosestheria sp., Diestheria sp.18.48 m
30. Gray-brown calcareous silty mudstone and fine sandstone interbedded Same color mudstone, shale and kaolin siltstone, sandstone. Ostracods at the bottom: Cypridea sulcata, Yanshanina postitruncata, Timiriasevia polymorpha; leaf limbs: Jil-iaoestheria gujialingensis, Yanjiestheria (Yanshania) dabeigouensis, Y. (Y.) subquadrata 18.48 m
29. Gray brown Shale, oil shale. Leaf-producing species: Yanjiestheria (Yanshania) dabeigouensis, Y. (Y.) subquadrata 11.84 m
28. Gray mud shale intercalated with thin to extremely thin layers of marl and calcareous shale, middle and upper parts Lenticular marl. Leaf-producing limb: Yanjies-theria (Yanshania) dabeigouensis 11.39 m
27. Gray-brown mud shale and yellow-brown medium-thin marl, forming a 0.5-1.0 m thick rhythm.
Leaf-producing species: Jiliaoestheria gujialingensis (Niu), Eosestheria sp., Diestheria sp.3.63 m
26. Gray-brown mud shale, thin to very thin layers of calcareous shale, and interbedded marl . Leaf-producing species: Jiliaoestheria gu-jialingensis, J.florovalvaris, J.striaris 5.11 m
25. Composed of tawny mud shale and khaki thin-layered calcareous shale and marl 2 to 3 m thick rhythm. Leaf-producing medium: Eosestheria (Clithrograpta) lingyuanensis 17.46 m
24. Gray brown and gray silty mudstone, mainly gray in the middle and upper parts, with increased mud content. Leaf limbs: Jiliaoes-theria gujialingensis, J.florovalvaris, J.striaris; ostracods in the middle part 23.74 m
23. Brownish-yellow, gray thin-very thin layered siltstone, silty sand Interbedded mudstone. The middle and upper parts are sandwiched by several thin layers of fine sandstone less than 20 cm thick, forming a counter-rhythm. Ostracods: Yanshanina sp.; bivalves; leaf limbs: Jiliaoestheria gujialingensis, J.florovalvaris, Eosestheria sp., Chaoyangestheria (Di-grapta) zhangjiagouensis, Ch. (Di.) luanpingensis 5.82 m
< p>22. Yellow-brown thin layer of medium-fine sandstone and sandy siltstone. Ostracods: Cypridea sulcata, Yanshanina elon-gata, Y.dabeigouensis, Y.postitruncata, Darwinula leguminella, D.contracta; leaf limbs: Jiliaoestheria gujialingensis, J.polyreticulata 3.98 m21. Yellow Brown tabular oblique bedding consists of coarse-grained feldspathic quartz sandstone interspersed with 30-50 cm yellow-green silty mudstone, and the upper part is thick green-gray silty mudstone 3.96 m
The lower part of Dadianzi Formation (equivalent to the original 2nd member of Dadianzi Formation):
20. The lower part is yellow-brown calcareous siltstone and gray-brown siltstone; the upper part is gray-brown calcareous mudstone, partially intercalated with gray matter masses and calcareous Mudstone lenses, calcareous bands or layers become increasingly silty and sandy towards the top or upper part. Leaf-producing media: Eosestheria (Diformograpta) donggouensis, E. (Dongbeiensis) bella, Yanji-estheria (Yanshania) cf.subquadrata; ostracods: Cypridea luanpingensis; bivalves: Ar-guniella lingyuanensis, A.yanshanensis 25.80 m< /p>
19. The lower part is silty mudstone sandwiched with 3 thin layers of medium-fine sandstone, and there are gray-brown calcareous medium-fine-grained sandstone lenses at the bottom; the upper part is calcareous mudstone, with thin layers of fine sandstone sandwiched in the middle and lower parts , with a layer of gray-green calcareous mudstone in the upper part; the top part is gray-brown silty mudstone.
Bivalves: Arguniella lingyuanensis; Gastropods: Probaicalia sp., Ptychostylus harpeaformis; Phyllopods: Abrestheria subovata, Eosestheria (Diformograp-ta) donggouensis, E. (Dongbeiestheria) bella, Yanjiestheria (Yanshania) dabeigouensis; Ostracods : Cypridea luanpingensis, C.subgranulosa (including C.granulosa protogranulosa, C.granulosa granulosa), C.tubercularis, C.altidorsangulata, Yanshanina dabeigouensis, Y.postitruncata, Y.elongata, Djungarica saidovi, D.procurva, Timiriasevia polymorpha, Darwinula contracta et al. 18.94 m
18. Gray-brown calcareous mudstone intercalated with marl or lenses. There is a lens of calcareous medium-fine sandstone at the bottom 3.50 m
17. Lens of gray-brown calcareous mudstone intercalated with marl. At the bottom, there are 0.2 to 2 m thick calcareous medium-fine sandstone lenses and 6.62 m of sandstone. 16. Gray-yellow-green calcareous mudstone and siltstone intercalated with marl lenses or thin layers. Produces bivalves: Arguniella lingyuanensis 9.34 m
15. Gray and gray-brown sandstone. The bottom is a calcareous gravelly coarse sandstone with large oblique bedding 1.92 m
14. Gray-brown medium-thin sandstone and siltstone, forming a rhythm of 6.41 m
13. Yellow-brown large-scale Trough-shaped cross-bedding calcareous sandstone lens 0.64 m
12. Gray green and gray white thin layers of corrugated fine sandstone and silty mudstone form a rhythm. Interbedded with 4 to 5 layers of sandstone, the thickness of the sandstone increases upward, which is a reverse sequence deposition of 2.56 m
11. Yellow-green calcareous mudstone. The bottom is a layer of 5-10 cm thick earthy yellow calcareous mudstone. Leaf-producing species: Eosestheria (Diformograpta) donggouensis, Abrestheria subovata; gastropods: Ptychostylus harpeaformis 3.85 m
10. Gray-green mudstone intercalated with marlstone lenses. The bottom is a layer of 0.5-1 m thick calcareous medium sandstone 7.40 m
9. Gray-yellow-green silty mudstone. The bottom is a 1-2 m thick medium sandstone lens with large oblique bedding and granular sequence bedding, with two sedimentary rhythms. The leaf-producing limbs are 2.96 m
8. Gray-white silty mudstone and calcareous mudstone. The bottom is a layer of calcareous medium sandstone 1.96 m
7. Gray-green small oblique bedding calcareous sandstone and mudstone, forming a rhythmic layer. The sandstone is 10-20 cm thick, and the mudstone is 10-50 cm thick 4.02 m
6. Gray-yellow-white coarse siltstone and mudstone form the rhythmic layer. The bottom is 0.5 to 1.5 m thick calcareous medium sandstone with large cross-bedding. Sandstone and fine sandstone increase in the middle and upper parts, which is an inverse sequence deposit of 6.03 m
5. Gray-green gravelly coarse sandstone, coarse powder Sandstone and mudstone form 2 counter-rhythms. The bottom is gray-white large-scale cross-bedding calcareous medium sandstone, and the middle sandstone is a lens of 1.77 m
4. The lower part is gray-brown calcareous medium sandstone-gravel-bearing coarse sandstone, which constitutes reverse sequence sedimentation; it gradually changes upward to Sandstone, mudstone interbedded and gray-green mudstone 4.02 m
3. The bottom is 0.5-0.8 m thick calcareous gravelly medium-coarse sandstone with large cross-bedding, forming 2 rhythms, gradually interlayered with mudstone upwards . The thickness increases and forms a rhythmic layer of thin sandstone and mudstone 4.02 m
2. Gray-green mudstone.
The bottom is 0.3-1 m thick calcareous medium-coarse sandstone and a medium-thin coarse siltstone-fine sandstone lens with large plate-like cross-bedding, and there is a fine sandstone and mudstone rhythmic layer 13.40 m in the middle
1. Grey-green silty mudstone and siltstone. There is a 30 cm gray-green coarse sandstone at the bottom 1.34 m
0. A huge thick layer of coarse conglomerate>3.00 m
The next section is connected to the Xiaying section of Zhangjiagoumen Village:
32. (corresponding to layer 0 of Shangying section) 5.80 m of brown massive giant and coarse conglomerate intercalated with fine conglomerate and gravelly coarse sandstone
The lower part of Dadian sub-layer (corresponding to the original Dadian Subgroup 1):
31. The lower part is gravelly coarse sandstone and fine conglomerate containing a large amount of mud; the middle part is muddy medium-fine conglomerate with massive bedding - trough shape Cross bedding - parallel bedding; the top is kaolin claystone 3.87 m
30. Grayish brown silty calcareous mudstone 6.45 m
29. Thick - extremely thick layer Feldspar quartz sandstone with large trough-like bedding, gravel at the bottom 1.20 m
28. Gray-green siltstone 3.01 m
27. Gray-yellow brown with large oblique bedding and Parallel-stratified medium-grained feldspathic quartz sandstone intercalated with a small amount of siltstone 4.21 m
26. Sandstone and gray-yellow clayey siltstone form four 0.5-1 m thick rhythms, with a base of 1-2 m thick feldspathic quartz sandstone 9.63 m
25. Gray brown, gray green silty mudstone, with a bottom of 0.5 m thick medium feldspar quartz sandstone 2.41 m
24 .Yellow-green, gray-green calcareous mudstone, siltstone and clayey mudstone with marl lens 6.62 m
23. Black paper-like mud shale with thin layers of earthy yellow calcareous shale powder Bands of sandy marl and calcareous siltstone. Produced bivalves: Arguniella lingyuanensis; Ostracods: Cypridea xitaiyangpoensis, C.dabeigouensis, Yanshanina dabeigouensis, Y.postitruncata, Y.elongata, Rhinocypris subechinata, Djungarica saidovi, Yumenia sp., Timiriasevia polymorphga 9.15 m
22. The bottom is yellow-brown gray muddy siltstone intercalated with marl lenses; the middle is gray and gray-yellow calcareous mud and shale; the top is pure feldspathic quartz sandstone. Ostracods produced: Cypridea spp., Yanshanina spp., Rhinocypris sp., Timiriasevia sp.3.05 m
21. Gray-green clayey mudstone, with a 30 cm thick red plate-like oblique bedding at the bottom Sandstone, with gray calcareous shale and siltstone on top. Ostracods: Cypridea dabeigouensis, Yanshanina dabeigouensis, Y.postitruncata, Y.elongata, Darwinula contracta; leaf limbs: Eosestheria (Diformo-grapta) donggouensis, Abrestheria subovata, A.ovata 30.22 m
20 .Gray-brown fine siltstone and silty mudstone; the middle and upper parts are gray-green calcareous mudstone, and the large part is intercalated with silty mudstone.
Producing bivalves: Sphaerium jeholense; Gastropods: Probaicalia vitimensis; Ostracods: Yanshani-na elongata, Y.postritruncata, Y.dabeigouensis, Djungarica saidovi, D.stalida, Cypridea subgranulosa (=C.granulosa protogranulosa), C .tubercularis, C.xitaiyangpoensis, Timiriasevia polymorpha, T.sp., Rhinocypris echinata, R.subechinata, Darwinula leguminella 17.90 m
19. Brown-yellow sandstone, with a bottom of 20 cm thick coarse siltstone or fine Sandstone, the upper part is silty mudstone 8.41 m
18. The gray-green clayey mudstone is intercalated with a large number of brown marl lenses, and the middle and upper part is intercalated with a layer of 30 cm thick fine sandstone. Bivalves: Arguniella lingyuanensis, Sphaerium jeholense; Gastropods: Gyraulus sp.; Ostracods: Cypridea stenolonga, C.subgranulosa (=C.grannulosa protogranu-losa), C.sp., Yanshanina postitruncata, Y.dabeigouensis , Djungarica saidovi 9.34 m
17. Brown-yellow medium-fine-grained feldspathic quartz sandstone 0.93 m
16. Earthy yellow siltstone 0.96 m
15. Soil Yellow medium-thick layer of medium-grained sandstone 0.24 m
14. The lower part is medium-coarse sandstone; the upper part is yellow-green siltstone 0.96 m
13. Fine sandstone intercalated with gray-green clayey mudstone and Marl lens 3.83 m
12. Gray-green clayey mudstone intercalated with gray-yellow marl lens 8.38 m
11. Gray-yellow with trough-shaped cross-bedding and parallel In the bedding, coarse feldspathic sandstone intercalated with clayey mudstone 1.20 m
10. Gray-green and green-gray clayey mudstone 3.35 m
9. Yellow-brown calcareous mudstone intercalated with siltstone, Marl lens. Leaf-producing media: Abrestheria subovata; Ostracods: Cypridea stenolonga, C.sp., Yanshanina dabeigouensis, Y.postitruncata, Djun-garica elongata, Darwinula sp.7.80 m
8. Bottom is 50 cm Yellow-brown gravelly coarse sandstone with oblique bedding, the middle part is brown-yellow coarse siltstone, and the top is gravelly coarse sandstone with trough cross-bedding 1.19 m
7. Yellow-green silty mudstone, partially Sandstone and marl lenses. Ostracods produced: Yanshanina pos-titruncata 2.77 m
6. Thick layer of feldspathic quartz sandstone, calcareous cement, inverse sequence structure, top sandstone and overlying mudstone gradient transition, with trough cross-bedding 0.79 m
Dabeigou Formation:
5. Medium-thick layer of medium-coarse-grained feldspathic quartz sandstone and gray-green silty mudstone rhythm, intercalated with a small amount of marl lens , developing 4 rhythmic layers, with medium-sized oblique bedding 4.36 m
The following section is connected to the lower section of the elm tree in Zhangjiagoumen Village:
The bottom of the Dadian sub-layer (equivalent to the original Dadian Bottom of Section 1 of Subgroup):
21. Yellow-brown fine conglomerate, gravelly coarse sandstone 1.83 m
Section 2 of Dabeigou Formation:
20 . Yellow-green medium-thin layer silty mudstone.
Produced ostracods: Eoparacypris surriensis, E.jingshangensis, E.obesa, Darwinula leguminella; leaf limbs: Nestoria pissovi10.96 m
19. Yellow-green calcareous mudstone, dark gray mudstone, shale and Medium thin layers of calcareous mud shale and marl lenses form 4 rhythms. Ostracods: Luanpingella postacuta, L.dorsincurva, Eoparacypris sur-riensis, E.obesa, E.jingshangensis, E.aff.macroselina, Pseudoparacypridopsis luanpin-gensis, Limnocypridea subplana, Rhinocypris dadianziensis, R.subechinata, Djungarica sp.1 , D.sp.2, Darwinula sp.; leaf limbs: Nestoria pissovi, N.xishunjingensis, N.cf.rotalaria are found in the lower part of this layer, and Nestoria xishunjingensis, N.sp.18.27 m
18. The bottom is a rhythmic layer composed of calcareous silty mudstone, siliceous mudstone, and gray-white and gray limestone lenses. The lower part is earthy-brown calcareous mudstone intercalated with lenticular marl or thin-middle calcareous mudstone. There are calcareous siltstones and fine sandstones intercalated with very thin layers of mud calcareous sandstone in the middle and top. Ostracods: Luanpingella postacu-ta, Eoparacypris jingshangensis, E.surriensis, Darwinula leguminella, D.dadianziensis, D.sp.; leaf limbs: Nestoria xishunjingensis, Keratestheria gigantea, K.ovata in the lower part of this layer, and Nestoria in the upper part. xishunjingensis, Keratestheria gigantea, K. longipoda 59.43 m
Section 1 of Dabeigou Formation:
17. Gray-yellow, gray-green tuffaceous medium-coarse-grained sandstone 7.94 m
16. Gray-green welded tuff 1.77 m
15. Yellow-brown laminated medium-thin calcareous siltstone and silty mudstone 5.45 m
14. Yellow Brown mudstone with thin middle layers of siltstone in between. Leaf-producing media: Nestoria pissovi, N.xishunjingensis; Insects: Ephemeropsis trisetalis 20.88 m
13. Medium thin layers of calcareous mudstone intercalated with black shale and gray-yellow siltstone. Leaf-producing medium: Nestoria pissovi, N.xishunjingensis 1.39 m
12. Yellow-brown siltstone intercalated with 5-10cm calcareous mudstone. Leaf-producing species: Nestoria pissovi, N.xishunjingensis, N.krasinetzi, N.karaica, N.rotalaria 11.88 m
11. Yellow-brown siltstone, silty mud shale. The lower part is a lens of siliceous calcareous shale intercalated with marl. 5.28 m
10. Gray-brown siliceous and calcareous shale. Leaf-producing species: Nestoria pissovi, N.xishunjingensis, N.karaica, N.rotalaria, N.mirififormis 1.92 m
9. Yellow-brown medium-coarse-grained feldspar quartz sandstone and siltstone 0.96 m
p>8. Earthy brown siltstone, silty mudstone intercalated with thin layers of calcareous shale. The bottom is dark gray laminated gray and siliceous mudstone, and the top is brown-black siliceous shale.
Leaf-producing species: Jibeilimnadia ovata, J.spp., Nestoria pissovi, N.xishunjingensis, N.krasinetzi, N.karaica 5.28 m
7. Gray-yellow medium-thin siltstone interlayered with multiple layers of 0.5 m Thick calcareous shale and marl. Leaf-producing medium: Nestoria pissovi; plant fragments 9.12 m
6. Dark gray thin slices, laminated siliceous shale and brown-yellow calcareous shale, interspersed with marl lenses. The top is a high-frequency rhythmic layer composed of thin layers of siliceous mud shale and siliceous shale, and the topmost layer has gray-green mudstone intercalated with silty mudstone. Leaf-producing media: Nestoria xishunjingensis, N.pissovi, N.luanpingensis, N.karaica, N.krasinetzi, Yanjiestheria (Yanshania) xishunjingensis, Y.subovata 7.25 m
5. Yellow-brown thin middle layer of coarse powder The sandstone is intercalated with lenticular fine sandstone and siliceous mudstone. 3.02 m
4. Gray-brown thin middle layer of siliceous and gray mudstone interbedded with thin layer of silty mudstone. Leaf-producing species: Nestoria pissovi, Yanjiestheria (Yanshania) xishunjingensis 6.04 m
3. Light gray-yellow coarse siltstone and fine sandstone, forming 5 rhythmic layers 4.23 m
2. Gray-brown laminated mudstone, thin-bedded siliceous mudstone and siliceous shale, with tuffaceous fine sandstone on top. Ostracods produced: Luanpingella postacuta 2.42 m
1. Light gray-brown medium-thick layer, lamellar siliceous mudstone and earthy brown silty mudstone interbedded. Leaf-producing species: Yanjiestheria (Yanshania) xishunjingensis, Y. (Y.) subovata, Nestoria pissovi, N.xishunjingensis 4.23 m, total thickness 191.38 m
Underlying stratum Zhangjiakou Formation: rhyolite and strong melt Condensed tuff