The Navalmaíllo site is a karstic rockshelter located in a mountain environment near the Lozoya river. The location of the site allows for the close monitoring of the surrounding area, for following the migrations of animals and for the temporary residence of human groups. The difficulties associated with estimating the time span of occupational processes at archaeological sites raise the problem of the synchrony and diachrony of occupations that form palimpsests. Archaeostratigraphy has revealed the integrity of the sedimentary deposit, how it has been affected by both natural agents (falling boulders and the conservation of the site) and human agents (the excavation method). The deformation of the plastic deposit is reflected in the archaeostratigraphy, but the two periods of occupation identified have been preserved and were not largely affected. The archaeostratigraphic approach has resulted in the identification of some of the taphosedimentary aspects of Layer F and in the deciphering of the cultural palimpsest, establishing the cultural sequence of occupations at the Navalmaíllo site.
RESUMEN
INTRODUCTIONThe problem of palimpsests (Bailey 2007) has been a considerable factor in the spatial/temporal considerations of intrasite studies. Understanding time in terms of distinct occupations is essential for establishing diachronic sequences characterized by synchronous assemblages of archaeological items (Vaquero et al . 2001a(Vaquero et al . , 2001b(Vaquero et al . , 2012. Archaeostratigraphic units constitute the best "picture" of an occupational episode and its technological, social and functional characteristics .The theoretical basis of archaeostratigraphy began with some publications in the 80s and referred to the sequences of sedimentation, their relation with distinguishing archaeological assemblages and their temporal significance, issues directly related to the problem of the temporal accumulation of cultural material at the same location, in terms of occupations and frequentation (archaeological palimpsests). Binford (1981: 197) made reference to this problematic issue, in relation with the rates of sedimentation and the creation of palimpsests: "Rates of deposition are much slower than the rapid sequencing of events which characterizes the daily lives of living peoples; even under the best of circumstances, the archaeological record represents a massive palimpsest of derivatives from many separate episodes". Later, Ferring (1986; Stein and Deo 2002) realized that rapid sedimentation allowed one to distinguish and have a clear view of the archaeological assemblages that have been superimposed over time; he also noticed that a slow sedimentation does not allow distinguishing different assemblages, and therefore different occupations.Since the 90s there has been a proliferation and diversification of theoretical discussions related to space-time concepts (Fruitet 1991).Research at the Navalmaíllo rockshelter began in 2002, and the excavations conducted there have yielded important archaeol...