In the dense area of stone products exposed to the ground, five different sizes (about 2 × 3 m). The stone materials are collected and analyzed in detail by using technology typology. In addition, it has a tetrahedral selection of 1.2 × 5 m of soil and 10 cm of topsoil were removed. These 10 – 50 cm soil samples were screened by wet sieving at 2 cm intervals, and the residues found in each layer were counted. At the same time, the djcn 3-2-2 profile (No. 1-10) exposed and scattered on the ground of the study area was measured and excavated on ten hearth. The profile was collected from local sedimentary strata about 2 m southeast of the site. The section is about 100 cm thick. According to the lithology and color of the sediments, two main stratigraphic units are identified. Between 0 and 90cm, the stratum is composed of light yellow loess, where there are two buried cultural layers rich in charcoal. 24 – 28 cm and 30 – 32 cm, respectively; In the lower layer of D, 90-100 cm depth is blue gray lacustrine sediments. 45 samples were collected at 2 cm intervals along the cross section for measuring particle size, magnetic susceptibility, pollen, charcoal and fungal spores; Three charcoal samples (djcn 3-2-2c1) were collected from the furnace and burned soil in the field, and djcn 3-2-2c2 and djcn 3-2-2c3 from the burned soil (No. 5 and No. 8 hearth) were collected from AMS14C dating of beta analytical company in Miami, Florida, USA. AMS14C dates were further converted to calendar year values by using the intcal 13 calibration curve of calib Rev 7.0.2 program (stuiver and Reimer, 1993) (reimeret et al., 2013). Physical geography and environmental process of Qinghai Normal University. Spectrometer (ICP-MS). The unexposed middle part was used to measure the equivalent dose (DE). We also use automatic RIS ø The OSL measurements were obtained by TL / osl-da-20-c / dreamer. 90Sr / 90Y beta light source was used in the laboratory. Sample preparation included treatment with HCl (10%) and H2O2 (30%) respectively to remove organic matter and carbonate. Select 38 to 63 by wet sieving µ And treated with H2SiF6 for about 2 weeks. Water content 10 ± 5% to calculate age (stauch et al., 2012). The particle size and magnetic susceptibility were measured in the Key Laboratory of physical geography and environmental process of Qinghai Province, Qinghai Normal University. Standard processes were used for particle size analysis, including removing carbonate and organic matter with HCl (10%) and H2O2 (10%), respectively, and treating dispersant with 10 ml of 10% (NaPO3) 6 and shaking with an ultrasonic cleaning machine to fully disperse the particles (Lu and an, 1997). Susceptibility was analyzed with MS2 dual frequency susceptibility meter produced by bartington, UK. The low frequency magnetic susceptibility is obtained by calculating the difference between the average of three low frequency magnetic susceptibility values and the average of two background values. The fungal spores, charcoal and pollen samples were treated with HF (faegri and Iversen, 1989; Moore et al., 1991). The samples were boiled in 10% HCl and 10% KOH to dissolve calcium minerals and humus. The sample is then passed through 200 µ M sieve, and treated with 40% HF to digest the fine silica. Next, pass the sample through 7 µ M screen to remove clay sized particles. Finally, the samples were stored and fixed in glycerol jelly. Pollen and fungal spores were identified at 400 and 1000 magnification. The identification of fungal spore morphotypes is based on comparison with the descriptions and illustrations of van geel (1978), van geel et al（ Pollen and fungal spores of van.300 were recorded for each sample and expressed as a percentage of the total content. Pollen and fungi were first isolated by adding Lycoris radiata spores (27637 ± 563 spores) to calculate spore concentration values, and then use Tilia and Tilia graph software to make charts (Grimm, 2011). Charcoal was counted and divided into two types, namely 20 – 100 µ M and > 100 µ m。
HOU Guangliang
The site data of this data set comes from the prehistoric archaeological investigation report of Hexi Corridor compiled and published by Gansu Institute of cultural relics and Archaeology and Peking University School of Archaeology and culture in 2011. Map data comes from the national science and technology infrastructure platform -- National Earth system science data sharing service platform（ http://www.geodata.cn/ ）Including: 90 m resolution DEM of China; China 1:250000 first, third, fourth and fifth river classification data sets; 1 ∶ 4000000 vegetation data set of China; 1 ∶ 100000 desert data set in China. By sorting out the archaeological survey data of Hexi Corridor, applying the methods of cultural distribution boundary value and cultural center of gravity, this paper comprehensively analyzes the spatiotemporal evolution process of ancient culture in this area, and extracts the current environment (elevation, river, vegetation and sand) information of corresponding sites by using GIS technology, It also analyzes the driving mechanism of the evolution of ancient culture in the region. This data set can directly provide some regular support for the ancient and modern evolution of the sites in Hexi corridor.
HOU Guangliang
The surface palynological data in this dataset are from the East Asian palynological database（ http://eapd.sysu.edu.cn/database/ And the surface pollen data of the northeastern margin of the Qinghai Tibet Plateau. The precipitation data of surface soil palynological points were obtained from the annual average precipitation data of 126 meteorological stations in the Qinghai Tibet Plateau and its surrounding areas (Xinjiang, Gansu, Sichuan) from 1950 to 1980 (the data came from China Meteorological Science Data Sharing Service Network) http://www.data.ac.cn/xiazai/ ）Because topography has a great impact on climate change, Therefore, in ArcGIS, the uneven distribution of annual precipitation data of meteorological stations is transformed into grid data on the surface of the Qinghai Tibet Plateau by Kriging spatial interpolation method, and the precipitation grid data of the surface palynological point can be regarded as the actual precipitation data of the point. By using the method of transformation function, the representative surface palynological types are selected, and the linear regression between them and modern climate is established. The fossil Palynological Assemblages are substituted into the regression equation to obtain paleoclimate parameters. Using the modern analogy method (MAT), assuming that the relationship between vegetation types and climate in the past is corresponding, we can compare the sporopollen spectrum of the strata indicating vegetation types with that of the present representative soil to reveal the similarity between them. Then we can get the corresponding precipitation data of the strata sporopollen by matrix operation with the modern precipitation data of the corresponding points.
HOU Guangliang
The data used in this paper are: the range and boundary data of the Qinghai Tibet Plateau [12]; 90 m in the international scientific data mirror website of computer network information center of Chinese Academy of Sciences (http: / / www.gscloud. CN) × DEM data products with 90 m spatial resolution; The site data is mainly based on the results of the second national cultural relic survey, combined with the cultural relic Atlas of relevant provinces. In the process of data processing, firstly, the specific location of the site is determined, and the site with unknown longitude and latitude is interpreted with google satellite map; Secondly, according to the identification standard of China's cultural relics census, the sites are classified and dated (excluding the points with unknown age), and a small number of cross age sites are calculated repeatedly. Finally, according to the characteristics of archaeology, history and chronology system, the sites in the study area are counted according to the comprehensive division method of cultural type and history. The application of GIS and RS in the research of settlement and regional archaeology is becoming more and more mature. The shortest path in GIS is used to simulate the prehistoric traffic route of the Qinghai Tibet Plateau, and the kernel density estimation method is used to calculate the data aggregation of the whole region according to the input feature data set, so as to produce a continuous density surface. The results show that the distribution probability of the research object can be directly expressed, and the size of the kernel density represents the agglomeration degree of the site in the spatial distribution. The larger the kernel density estimation is, the denser the distribution density of the site is. The distance between the centroid of each element and its nearest element is measured by the average nearest neighbor index, and the average value of all the nearest distances is calculated, and compared with the average distance in the hypothetical random distribution, so as to judge whether the studied elements are clustered distribution. The description of the spatial distribution characteristics of attributes in the whole region is used to judge whether a certain element or phenomenon in the study area has aggregation characteristics in space. In this paper, the global Moran's I index is used to measure the global spatial autocorrelation degree of the sites in the Qinghai Tibet Plateau.
HOU Guangliang
The data is based on the published archaeological materials in Gansu and Qinghai areas, and the excavation reports of 21 sites in 7 Cultural sequences in the study area, including 12 sites in Gansu and 9 sites in Qinghai. By using the method of mathematical statistics, this paper sorts out the quantity, height and combination of the pot, bowl, basin, pot, Zun, Weng, Dou, bowl, plate, cup, pan, bottle, jar and steamer of the Neolithic Bronze Age in Gansu Qinghai area. In view of the fact that there are many kinds of cultural relics in some sites, this paper uses the method of repeated statistics of cultural periods to determine the data of a certain cultural type. By using the method of mathematical statistical analysis, this paper makes a statistical analysis of the collected data, and analyzes and interprets the relationship between the data by drawing the change trend chart; In addition, this paper calculates and summarizes the quantity proportion and combination of a certain utensil in its cultural sequence, so as to ensure the cross validation among the three, further reveal its changing characteristics and reveal its changing rules. This paper mainly discusses the evolution of the four types of commonly used pottery, and analyzes the factors that may affect the evolution of pottery in combination with the paleoclimate records and archaeological data in Gansu Qinghai region and its surrounding areas.
HOU Guangliang
In July 2017, our team carried out field vegetation quadrat survey and livestock manure sample collection in Henan and Zeku counties. Random sampling 100 m × 5 ~ 10 pieces of unweathered excrement of the same grazing livestock in 100 m area were mixed into a sample and sealed for preservation. A total of 49 livestock manure samples were collected, including 30 yak (bosgrunniens), 11 horse (Equus ferus cabellus) and 8 sheep (Ovis aries). GPS was used to locate each sampling point, and the vegetation community and main vegetation types within the sampling point were recorded. The dry weight of each sample was 2 g. before sample treatment, 1 Lycopodium spore (27637) was added to each sample ± 563 grains per tablet were used to calculate the sporopollen concentration. Remove the calcareous cement with 10% HCl, after 200 μ The larger particle size of plant residues was removed by M sieve, and the organic matter was removed by 10% KOH in water bath at 70 ℃; Then 40% HF was added to remove the silicate. Finally, 7 μ The sporopollen was enriched by nylon sieve, cleaned and preserved in glycerin. The identification of sporopollen was carried out under 400 times optical biological microscope with reference to the sporopollen morphological atlas and literature. Tilia software was used to draw the sporopollen percentage map. The principal component analysis of sporopollen data was carried out by using canoco5.0 software. This data not only provides new research ideas and means for evaluating grazing livestock feeding habits and the impact of animal husbandry activities on regional vegetation in the Qinghai Tibet Plateau, but also provides important modern process basis and reference data for carrying out pollen analysis of fecal samples preserved in archaeological sites in the Qinghai Tibet Plateau in the future, so as to reconstruct the information of ancient vegetation communities and ancient human production activities.
HOU Guangliang
This dataset is derived from the paper: Ding, J., Wang, T., Piao, S., Smith, P., Zhang, G., Yan, Z., Ren, S., Liu, D., Wang, S., Chen, S., Dai, F., He, J., Li, Y., Liu, Y., Mao, J., Arain, A., Tian, H., Shi, X., Yang, Y., Zeng, N., & Zhao, L. (2019). The paleoclimatic footprint in the soil carbon stock of the Tibetan permafrost region. Nature Communications, 10(1), 4195. doi:10.1038/s41467-019-12214-5. This data contains R code and a new estimate of Tibetan soil carbon pool to 3 m depth, at a 0.1° spatial resolution. Previous assessments of the Tibetan soil carbon pools have relied on a collection of predictors based only on modern climate and remote sensing-based vegetation features. Here, researchers have merged modern climate and remote sensing-based methods common in previous estimates, with paleoclimate, landform and soil geochemical properties in multiple machine learning algorithms, to make a new estimate of the permafrost soil carbon pool to 3 m depth over the Tibetan Plateau, and find that the stock (38.9-34.2 Pg C) is triple that predicted by ecosystem models (11.5 ± 4.2 Pg C), which use pre-industrial climate to initialize the soil carbon pool. This study provides evidence that illustrates, for the first time, the bias caused by the lack of paleoclimate information in ecosystem models. The data contains the following fields: Longitude (°E) Latitude (°N) SOCD (0-30cm) (kg C m-2) SOCD (0-300cm) (kg C m-2) GridArea (k㎡) 3mCstcok (10^6 kg C)
DING Jinzhi, WANG Tao
This dataset is derived from the paper: Tang, H. et al. (2020). Early Oligocene vegetation and climate of southwestern China inferred from palynology. Palaeogeography, Palaeoclimatology, Palaeoecology, 560, 109988. doi:10.1016/j.palaeo.2020.109988 This data is part of Supplementary data of the paper, maily contains: Supplementary table 1) Pollen percentages, which were calculated using the collected pollen samples. Supplementary table 2) Plant functional types (PFTs) for the reconstructed paleovegetation of three sites : Wenshan (Early Oligocene), Jianchuan (Early Oligocene) and Lühe (Late Eocene). Recently, in the town of Lühe, central Yunnan, SW China, a new fossil-bearing section was found and dated as early Oligocene (~33–32 Ma) according to U-Pb isotope of volcanic tuff. The fossil-bearing section totals about 18 m in thickness. Fifty-five pollen samples were collected vertically throughout this Lühe town section. For each sample, 2–2.5 g of sediment were treated with KOH (10%,) HCl (10%) and HF (39%), then sample residues were sieved through a 5 μm nylon mesh in an ultrasonic tank. Spore and pollen grains were identified using both a light microscope (LM, Leica DM1000 microscope) and a scanning electronic microscope (SEM). Single grains were picked up by a capillary tube and then transferred to a copper stub, coated with gold and observed with a Zeiss EVO LS10 SEM. At least 300 pollen grains were counted for each sample under the LM at ×400 magnification. Then the pollen percentages were calculated using the sum of total terrestrial pollen. The paleovegetation was reconstructed following the method described by Prentice et al., 1996, Prentice and Jolly, 2000 and Ni et al. (2010). The paleobiomes were reconstructed by comparing the similarity of the palaeoflora with modern plant functional types (PFTs), according to the data published by Ni et al. (2010). The similarity between the palaeoflora and modern PFTs data was explored using Euclidean distances (Prentice et al., 1996) and the Jaccard Index Coefficient (Pound and Salzmann, 2017). The Jaccard Index Coefficient in the R package “clusteval” was used here to calculate the similarity. The palaeoflora was assigned to the biome with the highest similarity scores, taking into account dominant or key taxa.
TANG He
This dataset is derived from the paper: Deng, W. et al. (2020). Sharp changes in plant diversity and plant-herbivore interactions during the Eocene–Oligocene transition on the southeastern Qinghai-Tibetan Plateau. Global and Planetary Change, 194, 103293. doi:10.1016/j.gloplacha.2020.103293 This data contains herbivore damage patterns on fossil leaves of plant assemblages from the latest Eocene layer and the earliest Oligocene layer in Kajun Village, Markam County, southeastern margin of the Qinghai-Tibetan Plateau. Herbivore damage patterns on fossil leaves are essential to explore the evolution of plant-herbivore interactions under paleoenvironmental changes and to better understand the evolutionary history of terrestrial ecosystems. The Eocene–Oligocene transition (EOT) is a period of dramatic paleoclimate changes that significantly impacted global ecosystems, Researchers identified taxonomic composition of the flora, and investigated well-preserved herbivore damage on fossil leaves from two layers(the latest Eocene layer (MK-3, ~34.6 Ma) and the earliest Oligocene layer (MK-1, ~33.4 Ma)) of the Lawula Formation in Markam County, southeastern Qinghai-Tibetan Plateau (QTP), China. The data contains tables of the records of the leaves fossil, the fileds of the tables are as following: Basic Code; Database RFID; Family code; Genera code; Species code; Marks; Plant-herbivore; Leaves for damage; FFGs & DTs; Code marks; Hole feeding; Margin feeding; Skeletonization; Surface feeding; Piercing & Sucking; Oviposition; Mining; Galling; Fungal; Incertae Sedis; Boring; Undefined This dataset also contains some figures in the article.
DENG Weiyudong, SU Tao
This data includes the accessibility of 15 kinds of public facilities and services, such as roads and schools, in the communities of 1280 households at domestic and abroad, as well as the farmers' satisfaction with these public facilities and public services by comparing that with 3 years ago and current status with neighboring village. This data is used to support the analysis of the material capital part of sustainable livelihood. The data was collected by the research group through field survey in 2019. Before collecting the data, the research group and invited experts conducted a pretest and improved the survey questionnaire; Before the formal investigation, the members participating in the data collection were strictly trained; In the formal survey, each questionnaire is checked three times before it is filed. This data is of great value for understanding the physical capital accessibility and satisfaction of rural households in environment-economic fragile areas, and is an important supplement to national and macro data.
XIE Yaowen
1) Data content: Paleomagnetic data, magnetic index data, major element percentage data and chemical weathering index can establish the paleomagnetic age framework of the Dahonggou section and restore the precipitation change and chemical weathering history in geological history. 2) Data sources and processing methods The data source is experimental data. Paleomagnetic data: a cylindrical sample of 2x2x2cm was drilled with a small gasoline drill and measured with a low-temperature superconducting magnetometer in a magnetic shielding room. Magnetic data: the samples collected in the field were ground into fine particles by mortar and put into 2x2x2 non-magnetic plastic box, and tested by kappa bridge susceptibility meter, pulse magnetometer and rotating magnetometer. Mass percentage content and chemical weathering index data of major elements in the whole sample and particle size fraction: firstly, the whole sample and particle size fraction sample were pretreated with acetic acid and hydrogen peroxide to remove carbonate and organic matter, and then pressed into a round cake with a diameter of about 4cm and a thickness of about 8mm by a pressure apparatus, and finally XRF fluorescence analysis was carried out. 3) Data quality The sample collection and experimental processing are carried out according to strict standards, and the data quality is reliable. 4) Data application achievements and Prospects Three SCI papers were published using this set of data, one of which is Ni.
NIE Junsheng
The data include the Cenozoic plant fossils collected from Gansu, Qinghai and Yunnan by the Department of paleontology, School of Geological Sciences and mineral resources, Lanzhou University from 2019 to 2020. All the fossils were collected by the team members in the field and processed in the laboratory by conventional fossil restoration methods and cuticle experiment methods. The fossils are basically well preserved, some of which are horned The study of these plant fossils is helpful to understand the Cenozoic paleoenvironment, paleoclimate, paleogeographic changes and vegetation features of the eastern Qinghai Tibet Plateau.
YANG Tao
1) Data content: multi-model ensemble mean wind speed at 200 hPa and 850 hPa during the Last Glacial Maximum, mid-Holocene and pre-industrial period (reflecting high and low level westerlies), 850 hPa meridional and zonal winds (reflecting the East Asian monsoon circulation) and zonal mass streamfunction (reflecting Walker circulation); 2) Data sources: monthly data simulated by multiple climate models from the second and third stages of the international Paleoclimate Modelling Intercomparison Project; processing methods: multi-model equal weight arithmetic mean, monthly climate average; 3) Data application: used for the study of paleoclimate change and dynamic mechanism.
TIAN Zhiping, WANG Na
The study of fossils in Bangor and Lunpola is of great significance, and the date of fossils is indispensable. There are volcanic tuffs in this area. Zircon can be used for U-Pb age analysis to determine the age of strata and fossils. This data shows the zircon U-Pb age analysis results of tuff samples from bango and Lunpola fossil sites in a graphical way. The figure shows the shape of a large number of zircons, and indicates the age analysis results on different zircon samples. The data show the large sample size used in related research, and the analysis results are also clear. The image display of this data is intuitive and clear, and the results are reliable, which is of great significance to the study of the Qinghai Tibet Plateau.
SUN Boyang
We have completed the pollen analyses of 252 sedimentary samples from Dahonggou section in Qaidam Basin covering the Cenozoic. Palynomorph extraction followed the routine process with HCl and HF treatments during the extraction. Airborne pollen-charcoal traps and surface-sediment samples from soils were collected to evaluate the relationship between pollen-charcoal contents and vegetation structure, and effect of sedimentary environment conditions on the pollen dispersal and deposition. Combined with pollen-charcoal data from other sections, we are going to establish the fire history spanning the last 30 Ma years, and to discuss the responds and feedbacks of the vegetation and fire to the climate changes. Our work is beneficial to the knowledge of the processes of aridification in Inner Asia and its mechanism. The submitted pollen data set is according to the proposal, and in order to guarantee data accuracy, 20% of the data have been examined in our lab by random sampling method. Data collection and analysis are continued, we hope our work can contribute more to the project in the next few years.
MIAO Yunfa
This data set is composed of two sedimentary profiles of Huangyang river a (altitude: 2447 m, depth: 3.20 m, 37 ° 25 ′ n 102 ° 36 ′ E) and B (altitude: 2454 m, depth: 3.20 m, 37 ° 25 ′ n 102 ° 36 ′ E). Both of them are located in the hilly area at the northern foot of Qilian Mountain, 1km apart. The annual precipitation here is about 500mm, and the annual average temperature is about 2 ℃. The interval between the two slices was 2 cm, and 160 samples were obtained from each slice to analyze the total organic carbon, carbonate content, particle size and other information. The data set is of great significance to the study of paleoclimate / paleoenvironment.
LI Yu
The data include the carbonate content, carbon isotope and oxygen isotope analysis results of inorganic carbonates of 79 samples from 850 m natural section of the middle late Eocene in the salkuli basin. The carbon and oxygen isotopes of carbonate in the sediments record the hydrological and vegetation information in the geological history, which is one of the main indicators of paleoenvironmental tracer research. After grinding and sieving, the carbon and oxygen isotope analysis is completed by the sample processing unit (carbonate device) and MAT252 isotope mass spectrometry online automatic online system. The analytical accuracy of the sample is: carbon isotope is better than ± 0.06 ‰, and oxygen isotope is better than ± 0.08 ‰. Through the analysis of carbon and oxygen isotope data of solkuli section, the evolution history of arid environment since Eocene can be reconstructed, and the paleoclimate effect of the Tibetan Plateau uplift and global climate change can be discussed.
SUN Jimin
This data is the distribution data of the prehistoric era sites on the Qinghai-Tibet Plateau and surrounding areas, which is derived from the Supplementary Maps of the paper: Chen, F.H., Dong, G.H., Zhang, D.J., Liu, X.Y., Jia, X., An, C.B., Ma, M.M., Xie, Y.W., Barton, L., Ren, X.Y., Zhao, Z.J., & Wu, X.H. (2015). Agriculture facilitated permanent human occupation of the Tibetan Plateau after 3600 BP. SCIENCE, 347, 248-250. The Qinghai-Tibet Plateau, with an average altitude of more than 4000m, is the highestand largest plateau all around the world, and also is one of the most unsuitable areas for human life with long-term on the earth. The remains at the archaeological site are direct evidences left behind the ancient human activities. The original data of this data is digitized from the results of the Qinghai-Tibet Plateau high-textual census and archaeological survey (Qinghai Volume and Tibet Volume of the Chinese Cultural Relics Atlas). The map was digitized mainly based on the distribution maps of the sites, and the latitude and longitude coordinates and altitude were obtained. a total of 6,950 sites, most of which are distributed in the northern part of the plateau. The age range of the site is between 7000BP and 2300BP. This data set is of reference value for the research on the process and power of human diffusion to the Tibetan Plateau in the prehistoric era and other studies related to human activities in the Tibetan Plateau and the prehistoric era.
DONG Guanghui , LIU Fengwen
Paleoecological and paleolimnological studies can provide a long-term perspective on changes in environmental and ecosystem processes. The sediments documented both direct and indirect impacts of climate change and human activities on aquatic ecosystems. The fossils of zooplankton remain and pigments in lake sediments can reflect community structure changes of primary producers and primary consumers. The authors reconstructed the zooplankton and algal community changes during the past 600 years using carapaces of A. tibetiana and resting eggs of D. tibetana and pigments from the sediments of Dagze Co, in the central Tibet Plateau. Using total nitrogen and total phosphorus reconstructed the nutrient changes. These results suggest that algal community structure and changes in production can be attributed to alterations in the zooplankton community, with important implications for Tibetan aquatic ecosystems.
LIANG Jie LIANG Jie
The Lunpola Basin distributed in the central part of the Banggong-Nujiang suture belt contains thick and continuous Cenozoic sediments, which have great potential for increasing our understanding of the tectonic uplift, paleoaltimetry, erosion, and depositional history of the Tibetan Plateau and climate environmental evolution. In this study, detailed investigations were carried on a Cenozoic continuous lacustrine sedimentary section, Lunpori (LPR), from the upper sequence of the central basin. Constrained by tie points of U-Pb zircon ages in the layers of tuffs and mammalian fossils of a rhinocerotid humerus, paleomagnetic methods yield ages of ~21.2 to 15 Ma for the section. In addition, we further select some parameters (e.g., magnetic susceptibility and saturation isothermal remanent magnetization (SIRM)) to establish a high-resolution magnetic record to explore the paleoclimate change. The magnetic susceptibility is measured by Kappabridge while the SIRM is measured by Mini spin and Impulse Magnetizer. The results suggest that magnetic susceptibility (χ) gradually increases during the period of semi-deep to the deep lake but shows a decrease in the stage of the shallow lake. Combining with the maximum values of χ often appearing in the layer of sandstones and no obvious correlation between the χ and SIRM, we preliminarily considered that the supply of detritus may dominate the variation of the χ. Lithofacies, pollen, and fossil records suggest that a relatively temperate, humid climate prevailed in the Lunpola Basin during the sedimentary period of the Dingqinghu Fm.
TAN Mengqi
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