Paleoenvironment and possibilities of plant exploitation in the Middle Pleistocene of Schöningen (Germany). Insights from botanical macro-remains and pollen.

Plant use is an elusive issue in Paleolithic archaeology. Due to poor organic preservation in many sites, botanical material is not always present. The sediments in Schöningen, however, contain abundant botanical macro-remains like wood, fruits, seeds, and other parts of plants which offer the opportunity to reconstruct the local vegetation. Combined with palynological results, it is possible to reveal the full potential of this environment to hominins. Ethnobotanical studies of hunter-gatherer societies living in similar environments illustrate the importance of plants for subsistence purposes. The identified taxa from the archaeological horizons at Schöningen include a broad spectrum of potentially exploitable species that could be sources of food, raw material, and firewood.

New insights on the wooden weapons from the Paleolithic site of Schöningen.

The Paleolithic site of Schöningen is famous for the earliest known, completely preserved wooden weapons. Here we present recent results of an ongoing analysis of the nine spears, one lance, a double pointed stick, and a burnt stick dating to the Holsteinian, c. 300 kyr. Macroscopic and microscopic analyses, as well as studies of thin sections, contribute to a better understanding of the manufacture of the wooden weapons. They were deposited in organic sediments at a former lakeshore among numerous bones of butchered horses. In general, the spears are extremely well-preserved and show no or little sign of taphonomic alteration, although some of the weapons are broken and parts were slightly moved, probably by water action. The excellent preservation conditions provide considerable information on the operational sequence of production. The hunters selected thin trunks of spruce or pine and initially stripped off the bark. Traces of cutting, scraping, and smoothing can be observed on the spear surfaces in detail. In the case of spear X, repeated use of the weapon is implied by re-sharpening of the tip. Analyses of wood anatomy provide information on climatic conditions and contribute to the better understanding of the development of the site.

Olive tree-ring problematic dating: a comparative analysis on Santorini (Greece).

Olive trees are a classic component of Mediterranean environments and some of them are known historically to be very old. In order to evaluate the possibility to use olive tree-rings for dendrochronology, we examined by various methods the reliability of olive tree-rings identification. Dendrochronological analyses of olive trees growing on the Aegean island Santorini (Greece) show that the determination of the number of tree-rings is impossible because of intra-annual wood density fluctuations, variability in tree-ring boundary structure, and restriction of its cambial activity to shifting sectors of the circumference, causing the tree-ring sequences along radii of the same cross section to differ.

Identification, measurement and interpretation of tree rings in woody species from mediterranean climates.

We review the literature dealing with mediterranean climate, vegetation, phenology and ecophysiology relevant to the understanding of tree-ring formation in mediterranean regions. Tree rings have been used extensively in temperate regions to reconstruct responses of forests to past environmental changes. In mediterranean regions, studies of tree rings are scarce, despite their potential for understanding and predicting the effects of global change on important ecological processes such as desertification. In mediterranean regions, due to the great spatio-temporal variability of mediterranean environmental conditions, tree rings are sometimes not formed. Often, clear seasonality is lacking, and vegetation activity is not always associated with regular dormancy periods. We present examples of tree-ring morphology of five species (Arbutus unedo, Fraxinus ornus, Quercus cerris, Q. ilex, Q. pubescens) sampled in Tuscany, Italy, focusing on the difficulties we encountered during the dating. We present an interpretation of anomalies found in the wood structure and, more generally, of cambial activity in such environments. Furthermore, we propose a classification of tree-ring formation in mediterranean environments. Mediterranean tree rings can be dated and used for dendrochronological purposes, but great care should be taken in selecting sampling sites, species and sample trees.