Direct Rock Art Dating in China

Direct Rock Art Dating in China: Comparison

Please note this is a comparison between Version 1 by Robert Bednarik and Version 2 by Lindsay Dong.

This paper summarizes the scientific study of rock art in China, focusing on the direct dating of rock art. It pays particular attention to the recent work of the International Centre for Rock Art Dating (ICRAD) at Hebei Normal University and explains the problems of the uranium-thorium analysis of reprecipitated calcium-carbonate skins related to rock art.

rock art
petroglyph
China

1. Introduction

Immovable cultural heritage occurs throughout the world and in many forms, of which rock art is the most numerous of manifestations. In the case of China, the connection between rock art and other such heritage is particularly important because features such as statues, religious and secular structures or rock inscriptions of known ages have been used extensively to calibrate the direct dating of rock art. Estimating the ages of rock art is one of the most challenging tasks of archaeology and is riddled with controversies [1]. Many approaches have been tried, and it has become evident that the methodology of ‘direct’ dating is the most dependable of them. It is characterized by a direct physical relationship between the rock art in question and the dating criterion, and the falsifiability of the propositions concerning that relationship.

Figure 1. Tang Huisheng conducting the first replicable direct dating of rock art in China in 1997 at the Lushan petroglyph site in Qinghai Province (photograph by Gao Zhiwei, with permission).

A wide range of potential ‘dating criteria’ has been appraised, but there are difficulties with many of them. Most importantly, the demand for falsifiability renders it is essential that the analysis should be repeatable: another researcher must be able to test the claim by repeating the experiment. Such replication is not possible with many methods proposed or already used because they involve the removal of physical samples that are sacrificed in the process of analysis. Such methods may also be challenged on ethical grounds by arguing that these interventions damage the integrity of the rock art or its relationship with contiguous features, such as mineral accretions. Examples include extracting carbon-bearing substances contained in rock art paint residues, cations present in rock varnishes covering petroglyphs, or determining the nature of uranium and thorium components of reprecipitated carbonates. Many of these applications are severely hampered by the significant variations of the concentrations of the dating criteria elements in coeval mineral skins on a millimetre-scale, which may be well above 100% ^[2][3][2,3].

2. Direct Rock Art Dating in China

These first two direct dating attempts of Chinese rock art refer to endeavours that were not testable by replicating the experiments on which they were based. The subsequent results were derived from Tang Huisheng, who, in 1997–1998, introduced the use of microerosion analysis in Qinghai Province ^[4][10]. He collected microerosion calibration data from three petroglyph sites: Shuixia, Lebogou and Kexiaotu. These were then used to place petroglyphs from three more sites chronologically: Lushan, Lumanggou and Yeniugou. These were found to be approximately E2000, E2300 and E3200 years old, respectively (the ’E’ prefix indicates that the age estimate was derived from erosion data). Since these measurements are repeatable, they fully comply with the requirements of direct rock art dating (Figure 1). Tang then secured age estimates from three cupules at the Jiangjunya site at Lianyungang City, Jiangsu Province, ranging from E4300 to c. E11,000 years BP, using calibration obtained from a Buddhist inscription at nearby Kongwang Hill, dating from April 61 CE ^[5][11]. All methods currently used to estimate the ages of rock art are experimental, and that includes microerosion analysis [1]. However, that method offers significant advantages, such as full replicability and lack of physical intervention. Microerosion-derived age estimates of petroglyphs can only be approximate because precipitation can vary as a function of time. Nevertheless, the results of seven ‘blind tests’ conducted in Russia, Portugal, Italy, Bolivia, Australia (2) and China matched archaeological expectations very well ^{[6][7][8][9][10][11][12]}[12,13,14,15,16,17,18]. In terms of their magnitude, results from this method are fully reliable. Radiocarbon analysis, by contrast, can provide very precise results, but when obtained from rock art these may be entirely false. Those obtained from paint residues can only be accepted if the substance analyzed has been identified and separated, be it at the molecular or at the object level ^[13][19]. The discovery of a major rock art concentration in Henan Province ^[14][20] prompted a very successful rock art dating expedition in that region and Ningxia and Jiangsu Provinces during June and July 2014 ^[15][21]. It utilized China’s wealth of rock surfaces suitable for microerosion calibration, especially soundly dated rock inscriptions. Several calibration curves, as well as twenty-seven age estimates from petroglyphs, were secured. The microerosion method endeavours to ascertain when crystals in the grooves of percussion grooves were fractured by impact during petroglyph production. At that time, the edges of these fractures were totally sharp, but erosion gradually rounds them at the microscopic level in a quantifiable process that is a function of time. The resulting micro-wanes reflect the time since the fractures occurred ^[6][7][12,13]. In contrast to most other known direct dating methods, it refers to criteria that are functions of actual age rather than minimum or maximum ages. It is also non-invasive and involves no contact with the rock art and there are no contaminating factors. The method even allows age determinations in the field. However, it also entails several disadvantages: it has so far only been applied to two minerals (quartz and feldspar); it requires minimum grain sizes of about 1.5 mm with fractures of about 90° between the cleavage surfaces, orientated so that the micro-wane faces the microscope; and the rock surface must have been exposed to precipitation ever since the petroglyph was created. Microerosion analysis provides very reliable but imprecise age estimates, with tolerances often in the order of 20–25%. The significant differences in rainfall in different environments can be accounted for by calibration against the microerosion of surfaces of known ages. In recent years a universal calibration has been created that is based on relative regional precipitation and can be applied where local calibration is not possible ^[16][17][22,23]. The only minerals calibrated so far are quartz and feldspar and the former is thought to have a range of up to maximal 50 ka.

3. The International Centre of Rock Art Dating (ICRAD)

The ICRAD established a simple ground rule to ascertain the scientific integrity of records: they must be presented so that another researcher can try to duplicate (or refute) the reported results, be it by the same or another method. Therefore, the dating criterion must be described so that the second researcher can re-locate the criterion reliably. ICRAD also emphasizes the need to establish protocols that would stand the test of time and will not need to be significantly modified in the future. To facilitate the implementation of these protocols, ICRAD has established a system of numbering each rock art age determination attempt with a unique code, much in the way radiocarbon dating results are identified. Without such a system, the growing mass of uncollated and incompatible data would eventually become unmanageable. ICRAD’s direct dating register will eventually be made available publicly to facilitate its use globally. Since the establishment of ICRAD, the efforts of direct-dating Chinese have continued unabated—in fact, they appear to be accelerating. In 2017, a large team conducted the first rock art dating program undertaken in Hubei Province, focusing on a mountainous area east of Tongbai ^[18][26]. Huai River rock art corpus includes numerous sites that generally resemble the Henan rock art to the north. Eight of them yielded age estimates, which in all cases derive from cupules. They all fall under 1270 years, ranging down to about 650 years, indicating that the extensive rock art complex is relatively young. The results of this work were interpreted according to the recently established universal calibration curve (UCC) ^[16][17][22,23].

4. The Trouble with U–Th Dating of Rock Art

The first application of U–Th analysis to estimate the age of rock art relates to petroglyphs on the ceiling of Malangine Cave in South Australia ^[19][34]. A speleothem lamina covers one generation of them that in turn bears another tradition of petroglyphs, thus providing a minimum date for one and maximum date for the other. Its radiocarbon age was 5550 ± 55 years bp, but the sample’s U–Th date was five times greater, 28.0 ± 2.0 ka. All subsequently dated similar carbonate speleothems subjected to both tests showed a similar pattern: the U–Th results were always older and, in most cases, significantly older than ¹⁴C or archaeological estimates (Figure 2) ^{[20][21][22][23][24][25][26]}[36,37,38,39,40,41,42]. Indeed, in two cases, both from China, the U–Th dates were more than one hundred times as old. A reprecipitated carbonate film at Yilin in Heilongjiang that can only be a few centuries old at most has provided a U–Th raw age of 134.6 ka, i.e., hundreds of times its realistic age [2]. An international team recently discovered a few hand and foot impressions of juveniles in a hardened travertine deposit at the Quesang Hot Spring site in Tibet. They correctly proposed that the age of these prints should approximate the rock’s age, which must have been soft and still forming at the time they were produced. They secured U–Th ‘dates’ from the travertine that would place the age of the formation between 169 ka and 226 ka. On that basis, they claimed to have found the oldest known rock art globally, probably made by Denisovans ^[27][43].

Figure 2. U–Th age determinations of speleothems compared with archaeologically realistic or radiocarbon ages of these same deposits.

This follows similarly spectacular claims from several cave sites in Spain, also based on U–Th data, that paintings thought to be of the late Upper Paleolithic were much older and were made by Neanderthals ^[28][29][30][44,45,46]. Due to these many concerns about the credibility of U–Th dates from non-crystalline reprecipitated carbonates, an intensive debate of the method when applied to thin or porous carbonates has developed over the last decade ^{[31][32][33][34][35][36][37][38][39][40]}[47,48,49,50,51,52,53,54,55,56]. The primary cause of the excessive ages attributed to reprecipitated carbonate deposits is the depletion of U by moisture. Solution may also remove detrital Th, there may be a transformation of aragonite to calcite, or samples may be contaminated by components of the support rock ^[41][42][43][57,58,59]. Two other factors are of great concern. One issue needing more attention is the significant variation of U concentrations in coeval calcite skins demonstrated to occur on a millimetre-scale that may be greater than 100% ^[2][3][2,3]. The second concern stems from the ‘blind tests’ we conducted due to the grossly incongruous U–Th results from Heilongjiang sites Mohe and Yilin 2 [2]. We split four samples from Yunnan Jinshajiang sites and submitted the two sets to two different U–Th laboratories ^[44][60]. Not only did this yield two entirely different sets of results, but the reporting protocols also differed profoundly. Moreover, three results produced negative values, probably attributable to significant leaching of U and other contaminating factors (Table 1). The stochastic distribution of the dates in Figure 2 suggests that the distortion is not systematic but seems to be a random function of taphonomic processes distorting the U–Th ratios. Most notably, the water-soluble U can be readily mobilized when the deposit is subjected to moisture. This frequently occurs with speleothems and even more so with travertine that is fully exposed to precipitation. Travertines are not dense crystalline formations like stalagmites; they have varying degrees of porosity which assists the reaction with carbonic acid to revert to their soluble (bicarbonate) phase.

Table 1. Comparison of the raw U–Th ages of four split samples provided by two laboratories: all ages in ka.

Sample	MR-1	HY-1	YDG-1	YDG-2
Laboratory 1	1.359 ± 0.179	2.362 ± 2.573	4.674 ± 5.118	20.077 ± 2.742
Laboratory 2	−7 +21/−26	−20 +26/−35	−14 +33/−45	0.4 ± 7.7

There are also a few more minor issues related to extraordinary claims of this nature about rock art. Although we have no reliable information on soft tissue dimensions of any robust humans, especially not on Denisovans, we assume that Neanderthals had thicker fingers than moderns, and we know that their feet differed from those of gracile humans ^[45][46][61,62].

5. Summary and Outlook

It needs to be emphasized that U–Th results of the Holocene, especially the second half of that period, seem to match ¹⁴C dates from the same deposits frequently. It is only as we approach the Pleistocene that the results of the two methods diverge. By the time 30,000 carbon years is reached, the corresponding U–Th ages are around 50,000 years—and this also appears to apply to fossil bone ^[47][71]. Nevertheless, the ²³⁰Th/²³⁴U method has been widely used to date carbonate speleothems, and when it produces extraordinary results, its advocates reject the need for checking these with another method ^[38][54]. One of the most consequential outcomes of the work by the International Centre for Rock Art Dating (ICRAD) is that it has found a path to test the results of U–Th analysis and thereby help resolve the deadlock between the opposing parties. First, it has begun to take multiple samples of coeval carbonate skins, confirming dramatic differences [2]. Second, the processing of split samples by multiple laboratories has shown no correspondence whatsoever, be it in actual dates or reporting protocols ^[44][60]. Direct rock art dating results that cannot be verified are questionable, and if different laboratories deliver wildly diverging dates of split samples, there is no basis for even the most rudimentary comparison. The refusal of the advocates of exclusive use of U–Th dating to consider applying a second method ^[38][54] also deprives the discipline of the most crucial attribute of good science—the facility of testability.

The method of microerosion analysis has become the most intensively used by ICRAD researchers, despite its lack of high precision. It offers reliability instead, simplicity of application, unlimited repeatability, the benefit of obtaining target dates rather than maximum or minimum ages, and its lack of physical intervention. In China, with so many historical sources, rock inscriptions and archaeological sources of dating information, the method has already been widely applied. Its results have, in many cases, been verified independently by archaeologically derived information of several types. By comparison, the exclusive application of U–Th analysis, especially in presumed Pleistocene contexts, has universally provided ages that are archaeologically far too great, and the reasons for this are well understood.

References

[1] Bednarik, R.G. The dating of rock art: a critique. Jl Archaeol Sci 2002, 29(11), 1213–1233.

[2] Tang H; Kumar, G.; Jin A. Rock art of Heilongjiang Province, China. Jl Archaeol Sci: Rep 2020, 31, doi:10.1016/j.jasrep.2020.102348.

[3] Hoffmann, D.L., Spötl, C., Mangini, A. Micromill and in situ laser ablation sampling techniques for high spatial resolution MC-ICPMS U–Th dating of carbonates. Chem Geology, 2009, 259, 253–261.

[4] Watchman, A. Investigating the cation-ratio calibration curve: evidence from South Australia. Rock Art Res, 1992, 9(2), 106–110.

[5] Bednarik, R.G., Li F. Rock art dating in China: past and future. The Artefact, 1991, 14, 25–33.

[6] Wang N. An introduction to rock paintings in Yunnan Province (People’s Republic of China). Rock Art Res, 1984, 1(2), 75–84.

[7] Tang H. Theory and methods in Chinese rock art studies. Rock Art Res, 1993, 10(2), 83–90.

[8] Qin S., Qin T., Lu M., Yü J. The investigation and research of the cliff and mural paintings of the Zuojiang River valley in Guangxi. Nanning, Guangxi National Printing House, China, 1987.

[9] Shao Q., Wu Y., Pons-Branchu. E., Zhu Q., Dapoigny, A., Jiang T. U-series dating of carbonate accretions reveals late Neolithic age for the rock paintings in Cangyuan, southwestern China. Quaternary Geochronology, 2021, 61, 101127; doi: 10.1016/j.quageo.2020.101127.

[10] Tang H., Gao Z. Dating analysis of rock art in the Qinghai-Tibetan Plateau. Rock Art Res, 2004, 21(2), 161–172.

[11] Tang H., Mei Y. Dating and some other issues on the prehistoric site at Jiangjunya. Southeast Culture, 2008, 202(2), 11–23.

[12] Bednarik, R.G. A new method to date petroglyphs. Archaeometry, 1992, 34, 279–291.

[13] Bednarik, R.G. Geoarchaeological dating of petroglyphs at Lake Onega, Russia. Geoarchaeology, 1993, 8(6), 443–463.

[14] Bednarik, R.G. The age of the Coa valley petroglyphs in Portugal. Rock Art Res, 1995, 12(2), 86–103.[15] Bednarik, R.G. Microerosion analysis of petroglyphs in Valtellina, Italy. Origini, 1997, 21, 7–22.

[16] Bednarik, R. G. Age estimates for the petroglyph sequence of Inca Huasi, Mizque, Bolivia. Andean Past, 2000, 6, 277–287.

[17] Bednarik, R.G. About the age of Pilbara rock art. Anthropos, 2002, 97(1), 201–215.

[18] Tang H., Kumar, G., Jin A., Wu J., Liu W., Bednarik, R.G. The 2015 rock art missions in China. Rock Art Res, 2018, 35(1), 25–34.

[19] Bednarik, R.G. Yanhua kexue — Yuangu yishu de kexue yanjiu (Rock art science: the scientific study of palaeoart, transl. by Jin A.) Xi'an, Shaanxi People’s Education Press (Shaanxi Xinhua Publishing & Media Group), 2020.

[20] Tang H. New discovery of rock art and megalithic sites in the Central Plain of China. Rock Art Res, 2012, 29(2), 157–170.

[21] Tang H., Kumar, G., Liu W., Xiao B., Yang H., Zhang J., Lu X.H., Yue J., Li Y., Gao W., Bednarik, R.G. The 2014 microerosion dating project in China. Rock Art Res, 2017, 34(1), 40–54.

[22] Beaumont, P.B., Bednarik, R.G. Concerning a cupule sequence on the edge of the Kalahari Desert in South Africa. Rock Art Res, 2015, 32(2), 162–177.

[23] Bednarik, R.G. Advances in microerosion analysis. Rock Art Res, 2019, 36(1), 43–48.

[24] Jin A., Zhang J., Xiao B., Tang H. Microerosion dating of Xianju petroglyphs, Zhejiang Province, China. Rock Art Res, 2016, 33(1), 3–7.

[25] Bednarik, R.G. The International Centre of Rock Art Dating and Conservation (ICRAD). Rock Art Res, 2016, 33(1), 111–112.

[26] Tang H., Jin A., Li M., Fan Z., Liu W., Kumar, G., Bednarik, R.G. The 2017 rock art mission in Hubei Province, China. Rock Art Res, 2020, 37(1), 67–73.

[27] Jin A., Chao G. The 2018 expedition to Fangcheng cupule sites in central China. Rock Art Res, 2019, 36(2), 157–163.

[28] Jin A., Chao G. The 2018 and 2019 rock art expeditions to Lianyungang, east China. Rock Art Res, 2020, 37(1), 74–81.

[29] Jin A., Chao G. The 2018 expedition to Anshan cupule sites, northeast China. Rock Art Res, 2021, 38(1), 3–9.

[30] Bednarik, R.G. The tribology of cupules. Geol Mag 2015, 152(4), 758–765.

[31] Bednarik, R.G. Tribology in geology and archaeology. New York, Nova Science Publishers USA, 2019.

[32] Li M., Lari J., Tang H., Li Y., Bednarik, R.G. The 2019 survey of petroglyphs in the Qinghai-Tibet Plateau, western China. Rock Art Res, 2022, 39(1), in press.

[33] Li M., Shi L., Wu X., Tang H. Discovery of new type of cave rock paintings in Guangxi Zhuang Autonomous Region, China. Rock Art Res, 2020, 37(1), 5–18.

[34] Bednarik, R.G. Die Bedeutung der paläolithischen Fingerlinientradition. Anthropologie, 1984, 23, 73–79.

[35] Taçon, P.S.C., Aubert, M., Gang L., Yang D., Liu H., May, S.K., Fallon, S., Ji X., Curnoe, D., Herries, A.I.R. Uranium-series age estimates for rock art in southwest China. Jl Archaeol Sci 2012, 39: 492–499.

[36] Bard, E., Hamelin, B., Fairbanks, R.G., Zindler, A. Calibration of the ¹⁴C timescale over the past 30,000 years using mass spectrometric U–Th ages from Barbados corals. Nature, 1990, 345, 405–410.

[37] Holmgren, K., Lauritzen, S.-E., Possnert, G. ²³⁰Th/²³⁴U and ¹⁴C dating of a late Pleistocene stalagmite in Lobatse II cave, Botswana. Quat Sci Rev, 1994, 13, 111–119.

[38] Labonne, M., Hillaire-Marcel, C., Ghaleb, B., Goy, J.L. Multi-isotopic age assessment of dirty speleothem calcite: an example from Altamira Cave, Spain. Quat Sci Rev, 2002, 21, 1099–1110.

[39] Plagnes, V., Causse, C., Fontugne, M., Valladas, H., Chazine, J.-M., Fage, L.-H. Cross dating (Th/U-¹⁴C) of calcite covering prehistoric paintings in Borneo. Quat Res, 2003, 60(2), 172–179.

[40] Quiles, A., Fritz, C., Medina, M.A., Pons-Branchu, E., Sanchidrián, J.L., Tosello, G., Valladas, H. Chronologies croisées (C-14 et U/Th) pour l’étude de l’art préhistorique dans la grotte de Nerja: méthodologie. In: M.A. Medina-Alcaide, A. Romero Alonso, R.M. Ruiz-Márquez, J.L. Sanchidrián Torti (Eds.), Sobre rocas y huesos: las sociedades prehistóricas y sus manifestaciones plásticas, 2014, pp. 420–427. Córdoba, Fundación Cueva de Nerja.

[41] Sanchidrián, J.L., Valladas, H., Medina-Alcaide, M.A., Pons-Branchu, E., Quiles, A. New perspectives for ¹⁴C dating of parietal markings using CaCO₃ thin layers: an example in Nerja Cave (Spain). Jl Archaeol Sci: Rep, 2017, 12, 4–80.

[42] Valladas, H., Pons-Branchu, E., Dumoulin, J.P., Quiles, A., Sanchidrián, J.L., Medina-Alcaide, M.A. U/Th and ¹⁴C crossdating of parietal calcite deposits: application to Nerja Cave (Andalusia, Spain) and future perspectives. Radiocarbon, 2017, 59, 1955–1967.

[43] Zhang D.D., Bennett, M.R., Cheng H., Wang L., Zhang H., Reynolds, S.C., Zhang S., Wang X., Li T., Urban, T., Pei Q., Wu Z., Zhang P., Liu C., Wang Y., Wang C., Zhang D., Lawrence Edwards, R. Earliest parietal art: hominin hand and foot traces from the middle Pleistocene of Tibet. Sci Bull, 2021, doi.org/10.1016/j.scib.2021.09.001.

[44] Hoffmann, D.L., Standish, C.D., García-Diez, M., Pettitt, P.B., Milton, J.A., Zilhã,o J. et al. U–Th dating of carbonate crusts reveal Neanderthal origin of Iberian cave art. Science, 2018, 359(6378), 912–915.

[45] Hoffmann, D.L., Standish, C.D., García-Diez, M., Pettitt, P.B., Milton, J.A., Zilhão, J., Alcolea-González, J.J., Cantalejo-Duarte, P., Collado, H., Balbín, R. de, Lorblanchet, M. Response to Comment on ‘U-Th dating of carbonate crusts reveals Neandertal origin of Iberian cave art’. Science, 2018, 362(6411):eaau1736.

[46] Hoffmann, D.L., Standish, C.D., Pike, A.W., García-Diez, M., Pettitt, P.B., Angelucci, D.E., Villaverde, V., Zapata, J., Milton, J.A., Alcolea-González, J., Cantalejo-Duarte, P., Collado, H., Balbín, R. de, Lorblanchet, M., Ramos-Muñoz, J., Weniger, G.C., Zilhão, J. Dates for Neanderthal art and symbolic behaviour are reliable. Nat Ecol Evol, 2018, 2, 1044–1045.

[47] Bednarik, R.G. U–Th analysis and rock art: a response to Pike et al. Rock Art Res, 2012, 29(2), 244–246.

[48] Clottes, J. U-series dating, evolution and Neandertal. Intern Newsl Rock Art, 2012, 64, 1–6.

[49] Pike, A.W.G., Hoffmann, D.L., García-Diez, M., Pettitt, P.B., Alcolea, J., Balbín, R. de, González Sainz, C., De Las Heras, C., Lasheras, J.-A., Montes, R., Zilhão, J. U-series dating of Paleolithic art in 11 caves in Spain. Science, 2012, 336(6087), 1409–1413.

[50] Pons-Branchu, E., Bourrillon, R., Conkey, M.W., Fontugne, M., Fritz, C., Gárate, D., Quiles, A., Rivero, O., Sauvet, G., Tosello, G., Valladas, H., White, R. Uranium-series dating of carbonate formations overlying Paleolithic art: interest and limitations. Bull Soc préh franç, 2014, 111(2), 211–224.

[51] Sauvet, G., Bourrillon, R., Conkey, M., Fritz, C., Garate-Maidagan, D., Rivero Vila, O., Tosello, G., White, R. Answer to ‘Comment on uranium-thorium dating method and Palaeolithic rock art’ by Pons-Branchu et al. Quat Intern, 2015, 432, 86–92.

[52] Hoffmann, D.L., Utrilla, P., Bea, M., Pike, A.W.G., García-Diez, M., Zilhão, J., Domingo, R. U-series dating of Palaeolithic rock art at Fuente del Trucho (Aragón, Spain). Quat Intern, 2016, 432, 50–58.

[53] Hoffmann, D.L., Pike, A.W.G., García-Diez, M., Pettitt, P.B. Methods for U-series dating of CaCO₃ crusts associated with Palaeolithic cave art and application to Iberian sites. Quat Geochron, 2016, 36, 104–116.

[54] Pike, A.W.G., Hoffmann, D.L., Pettitt, P.B., García-Diez, M., Zilhão, J. Dating Palaeolithic cave art: why U–Th is the way to go. Quat Internat, 2017, 432, 41–49.

[55] Aubert, M., Brumm, A., Huntley, J. Early dates for ‘Neanderthal cave art’ may be wrong. Jl Human Evol, 2018, 125, 215–217.

[56] White, R., Bosinski, G., Bourrillon, R., Clottes, J., Conkey, M.W., Corchón Rodriguez, S. et al. Still no archaeological evidence that Neanderthals created Iberian cave art. Jl Human Evol, in press, 144.

[57] Lachniet, M.S., Bernal, J.P., Asmerom, Y., Polyal, V. Uranium loss and aragonite-calcite age discordance in a calcitized aragonite stalagmite. Quat Geochron, 2012, 14, 26–37.

[58] Bajo, P., Hellstrom, J., Frisia, S., Drysdale, R., Black, J., Woodhead, J., Borsato, A., Zanchetta, G., Wallace, M.W., Regattieri, E., Haese, R. ‘Cryptic’ diagenesis and its implications for speleothem geochronologies. Quat Sci Rev, 2016, 148, 17–28.

[59] Fontugne, M., Shao, Q., Frank, N., Thil, F., Guidon, N., Boeda, E. Cross dating (Th/U-14C) of calcite covering prehistoric paintings at Serra da Capivara National Park, Piauí, Brazil. Radiocarbon, 2013, 55(2–3), 1191–1198.

[60] Tang H., Bednarik, R.G. Rock art dating by ²³⁰Th/²³⁴U analysis: an appraisal of Chinese case studies. Archaeol Anthrop Sci, 2021, 13(1), doi:10.1007/s12520-020-01266-0.

[61] Facorellis, Y., Kiparissi-Apostolika, N., Maniatis, Y. The cave of Theopetra, Kalambaka: radiocarbon evidence for 50,000 years of human presence. Radiocarbon, 2001, 43(2B), 1029–1048.

[62] Bednarik, R.G. Antiquity and authorship of the Chauvet Cave rock art. Rock Art Res, 2007, 24(1), 21–34.

[63] Bednarik, R.G. Palaeoart of the Ice Age. Newcastle upon Tyne, Cambridge Scholars Publishing, UK, 2017.

[64] Liritzis, I,, Vafiadou, A., Zacharias, N., Polymeris, G., Bednarik, R.G. Advances in surface luminescence dating: some new data from three selected Mediterranean sites. Medit Archaeol Archaeometry, 2013, 13(3), 105–115.

[65] Liritzis, I., Bednarik, R.G., Kumar, G., Polymeris, G., Iliopoulos, I., Xanthopoulou, V., Zacharias, N., Vafiadou, A., Bratitsi, M. Daraki-Chattan rock art constrained OSL chronology and multianalytical techniques: a first pilot investigation. Jl Cult Herit, 2018, 37, 29–43.

[66] Liritzis, I., Panou, E., Exarhos, M. (2017) Novel approaches in surface luminescence dating of rock art: a brief review. Medit Archaeol Archaeometry, 2017, 17(4), 89–102.

[67] Liritzis, I. A new dating method by thermoluminescence of carved megalithic stone building. Comp Rend (Acad Sci), Paris, 1994, 319, serie II, 603–610.

[68] Liritzis, Y. U234/Th230 dating contribution to the resolution of Petralona controversy; Nature, 1983, 299(5880), 280–281.

[69] Liritzis, Y. A critical dating revaluation of Petralona hominid: a caution for patience. Athens Ann Archaeol, 1984, 15(2), 285–296

[70] Liritzis, Y., Galloway, R.B. The Th230/U234 disequilibrium dating of cave travertines. Nuclear Instr Methods, 1982, 201, 507–510.

[71] Bednarik, R.G. The dating of rock art and bone by the uranium–thorium method. Rock Art Res, 2022, 39(2) (in press).