Paleosols and ancient societies: from early humans to the industrial revolution

Paleopedology, the study of soils developed on ancient landscapes (Yaalon, 1971), was born in Russia through the efforts of Boris B. Polynov (1927), but considering the previous work done by Vasilli V. Dokuchaev in 1883 (Dokuchaev, 1967) and later with the support of Constantin C. Nikiforoff (1943). The Commission on Paleopedology was established in 1965, in Denver, USA, by Dan Yaalon and Hans van Baren (Retallack, 2013) during the 7th Congress of the International Association for Quaternary Research (INQUA) and later, in 1968, the Commission was affiliated to the International Union of Soil Science (IUSS). After the Denver conference, the Commission published a volume with research papers focused on the recognition and classification of paleosols, methods of dating, and soil stratigraphy (Yaalon, 1971). This volume was the beginning of an extensive series of the Commission publications in different special issues of international and national scientific media. Two of these collections were published in open-access Mexican geological journals: Revista Mexicana de Ciencias Geológicas v. 20 no. 3 (2003) and v. 21 no. 1 (2004), and Boletín de la Sociedad Geológica Mexicana, v. 64 no. 1 and 64 no. 2 (2012). The current issue is a continuation of this series. There are two concepts necessary for understanding paleosols. The first is the use of the uniformitarian principle, which suggests that past geologic processes are similar to those acting today on the Earth’s surface. In other words, the basis of modern soil geography and soil genesis is used as directly analogous to reconstruct ancient environments and landscapes. This approach is more precise when applied to Quaternary paleosols and more limited to pre-Cambrian or Paleozoic paleosols, as the environmental conditions under which they were formed are pretty different from the modern ones (Retallack, 2001). The second concept is “soil memory” (Targulian and Goriachkin, 2004), related to a set of properties that can remember ancient environmental conditions. These properties result from pedogenetic processes and soil-forming factors and are time-resistant to environmental changes remaining stable during extended periods (Targulian and Goriachkin, 2004). In recent years, paleopedology has extended its applications to reconstruct past climates, establish variations in the atmospheric composition, trace the ecosystem evolution, and identify geomorphological changes (e.g., Cerling, 1991; Retallack, 1998, 2009; Goudi, 1990; Klinge et al., 2022). Some efforts have also been made to develop models to quantify pedogenetic trends associated with environmental change (e.g., Yaalon, 1975; Sheldon and Tabor, 2009). An essential application of paleopedology has been devoted to solving archaeological problems, as soils can be considered repositories of human activities: agriculture, forestry, material for construction or ceramic production, dwelling and householding (Holliday, 2009; Costa et al., 2021; Yalçın et al., 2021). The impact of past anthropogenic activities has been recorded in the soil memory through time: since the first hunter and gatherers groups to the industrial societies. However, the relationship between humans and their environment (and vice versa) is complex and demands the application of different methodologies and the study of in-site and off-site approaches (Butzer, 2008), which integrates the information directly recovered in the archaeological excavation and that from the surrounding areas. In this sense, the paleosol-archaeological investigation has a more solid interpretation. In June 2021, the Paleopedology Commission of the IUSS, the Paleopedology Working Group of the INQUA, and the Institute of Geology of the UNAM organized a three-day online meeting with scientific sessions. The meeting topics related to the link between paleosols, the history of human interactions, and the environment. This special issue was launched as a result of this meeting. The articles included here aim to improve our understanding of the materials used for ancient constructions also past human interactions with the environment.