Dírkonošci (Foraminifera), mořští prvoci s vápenatou schránkou, obývají naši planetu více než půl miliardy let. Zkoumáním způsobu života těch současných se mnohé dozvíme o jejich pravěkých předcích i o dávných mořích, ve kterých žili., Foraminifera - a rich group of mainly marine microorganisms - are widely used for paleoecological reconstructions. Their occurrence provides important data about past ecological conditions of the sites. We reconstructed former conditions in Židlochovice research site (southern Moravia) by comparing fossil communities with the recent ones present on the island of Rab (Adriatic Sea)., and Anna Poštulková.
This article is an archaeological report on the results of the excavation carried out around the fi lled-up river branch and bridge No. 1 in Mikulčice in 2012 (excavation B 2012). The main aim of the research was to complete the fi eld works at bridge No. 1, which was discovered during the large-scale excavations performed at the defunct river channel in front of the NW gate of the bailey in 1966-1968. At the same time, the question of how the river channel developed at the site of the bridge was investigated, as well as the topic of the settlement in the wider area between the bailey and the north-western suburb. Presented along with the interpretation of the movable fi nds from the defunct river branch were two possible variants on how the settlement developed in relation to the gradual fi lling-up of the river channel. After analysing the fi nd circumstances in area B 2012, the authors inclined towards the second variant and thus revised the existing theories concerning the evolution of sedimentation in the area of the extinct riverbed. This has helped to resolve some key questions regarding the existence and demise of the power centre in Mikulčice., Marek Hladík, Lumír Poláček., and Obsahuje seznam literatury
Interdisciplinary research into riverbed and the ramains of the bridge between the north-western suburb and the fortified bailey of the Mikulčice agglomeration (archaeological analysis).
Lokalita Mokré louky u Třeboně je rozsáhlé, dnes uměle odvodněné rašeliniště. V roce 1998 odtud bylo vyzvednuto cca 50 kmenů dubu letního (Quercus robur) o délce až 10 m a maximálním průměru 120 cm. Z 31 kmenů byly odebrány vzorky pro dendrochronologickou analýzu, která prokázala, že úhyn většiny dubů spadá do krátké periody počátku 20. let 10. století. Za účelem studia okolností, za kterých se dubový les na lokalitě vyskytoval a za kterých došlo k jeho zániku, byl proveden plošný odkryv. Na jeho místě byla studována stratigrafie a odebrány vzorky na pylovou a makrozbytkovou analýzu.V době, kdy se na ploše rašeliniště vyskytoval vzrostlý dubový les, nacházela se lokalita i její okolí v čistě přírodním stavu. Příčiny zániku lesa počátkem 10. stol. nelze zatím s jistotou určit, roli mohly hrát klimatické příčiny v kombinaci s lokálními faktory. Později, během vrcholně středověké kolonizace, došlo k prvnímu významnému zásahu do krajiny Třeboňské pánve. Zakládána byla pole, pastviny a louky, regionální lesní porosty ustupovaly, nebo alespoň degradovalo jejich přirozené složení. and The Mokré louky (lit. „Wet Meadows“) area near Třeboň is an extensive, today artificially drained, peat bog. In 1998, around 50 trunks of Sessile (Durmast) Oak (Quercus petrea) were removed from here, each around 10m in length and with a maximum diameter of 120 cm. Samples were withdrawn from 31 trunks for dendrochronological analysis, which showed that the deaths of most had taken place in a short period at the beginning of the 920’s AD. As part of a study of the events leading to the establishment of the oak wood on the site, and those which led to its demise, a larger area was opened for examination. The stratigraphy of the site was studied, and samples were taken for analyses of pollen and macro–remains. For the period in which woodland occupied what is now a bog, the site and its surroundings were in an entirely natural state. The causes of the woodland’s demise at the beginning of the 10th century are unclear, but an important role may have been played by climatic factors in combination with other external stimuli. Later, during the colonisation in the High Middle Ages, regional woodland growth receded, or their natural components were at least degraded.