Since the publication of the paper of Dean (1974), loss on ignition (LOI) has been widely used as a method to estimate the amount of organic matter and carbonate mineral content (and indirectly of organic and inorganic carbon) in sediments. The relationships between LOI at 550°C (LOI 550 ) and organic carbon (OC) content and between LOI at 950°C (LOI 950 ) and inorganic carbon (IC) content are currently accepted as a standard. However, the comparison of 150 analyses of samples of diverse lithologies, collected from a single core, reveals that these relationships are affected by sediment composition (presence of clays, salts, and the variable content of organic carbon). This results in an incremental error on the estimation of carbon content from LOI values that invalidates the use of LOI values as a quantitative method for estimating carbon content. Conversely, the general trends of LOI 550 and LOI 950 show a good correlation with carbon content (both organic and inorganic) allowing use of LOI as a qualitative test for carbon content. Similarly, in our case, LOI at 105°C (LOI 105 ) is a good qualitative proxy for the trends in gypsum content.

Knowledge of the evolution of Spanish fluvial networks has improved during recent years as more river systems have been studied and more geochronological data has become available. However, the chronological framework is a major issue as the range of applications is limited by methodological constraints and spatial coverage is sparse. Integration of 'absolute' dating methods with biostratigraphy and palaeomagnetism permits the recent evolution of these river systems to be reviewed. The timing of incision from the Late Neogene to the present varies between the major Iberian fluvial systems, depending on the substrata and tectonic settings. Early Pleistocene and older fluvial sequences in the core areas of the Iberian Peninsula provide a more extensive record of fluvial evolution and are better preserved than the terrace flights in the coastal lowlands. Middle Pleistocene sequences are well developed in most of the major river systems in Iberia, particularly those of the Tajo, Guadalquivir and Aguas River, and frequently represent the principal climatic cycles of that period, although tectonic and sea-level effects can also be seen. For Late Pleistocene to Holocene times, the scheme becomes more complex. Our review suggests that each river system has responded differently to local and regional climate control, glacial and periglacial processes in headwaters in high mountain areas, glacio-eustatic sea-level changes and local and regional tectonic patterns.

No abstract

IGCP 449 (2000–2004), seeking to correlate fluvial records globally, has compiled a dataset of archaeological records from Pleistocene fluvial sequences. Many terrace sequences can now be reliably dated and correlated with marine oxygen isotope stages (MIS), allowing potentially useful patterns in artefact distribution to be recognised. This review, based on evidence from northwest European and German sequences (Thames, Somme, Ilm, Neckar and Wipper), makes wider comparisons with rivers further east, particularly the Vltava, and with southern Europe, especially Iberia. The northwest and southern areas have early assemblages dominated by handaxes, in contrast with flake‐core industries in Germany and further east. Fluvial sequences can provide frameworks for correlation, based on markers within the Palaeolithic record. In northwest Europe the first appearance of artefacts in terrace staircases, the earliest such marker, dates from the mid–late Cromerian Complex. Flake‐core industries may have significantly preceded handaxe industries in southern Europe. An important technological innovation—Levallois technique—occurs at the Lower‐Middle Palaeolithic boundary, correlated with MIS 9–8. Humans deserted northern Europe during MIS 6, apparently returning to central Germany and northern France (Somme valley) by MIS 5e but not reaching southern England until the appearance of Mousterian culture during MIS 4–3. Copyright © 2006 John Wiley & Sons, Ltd.

No abstract