Silicified angiosperm wood from the Dangu locality (Ypresian of the Gisors region, Eure, France) - final part: the problem of palaeoclimate reconstruction based on fossil wood

The systematic part of the study of the Dangu locality, dealing with angiosperm wood, is completed. In addition to three previously described types (two species), two others (Dichrostachyoxylon cf. zirkelii and Anogeissus sp.) are described. A new combination Dichrostachyoxylon sahabiense (Louvet) n. comb. is proposed. The locality as a whole reflects a specific climatic regime, corresponding approximately to the paratropical rain forest. Most broad-leaved trees and palms grew on riverbanks under favourable microclimate. Conifers and Anogeissus were more distant from surface waters, probably on uplifted terrain, exposed to seasonal dry periods. Proximity of a lagoon is suggested. Regarding the palaeoclimate reconstruction based on fossil wood in general, two main problems have been encountered: intraspecific and individual variability of non-ecological significance, and insufficient number of fossil wood types necessary for statistical methods.