Ilie GABRIEL COSMIN, UNIVERSITATEA DIN BUCURESTI, FACULTATEA DE GEOGRAFIE, Romania
Grecu FLORINA, UNIVERSITATEA DIN BUCURESTI, FACULTATEA DE GEOGRAFIE, Romania
Research on geosites reveals information and characteristics capable of restoring their representativeness, rarity, integrity, lithology, as well as an overview of regional paleogeographic evolution. Thus, a geosite can represent, by its nature, its genesis or its location, a proof of the way in which the landform hosting it has evolved over geological periods.
The geological and paleontological reserve B?dila Limestone Blocks, located in the minor riverbed of Buz?u river (Curvature Subcarpathians), form a punctual geosite marked by the existence of huge blocks that reach up to 15m in high, imposing themselves in the landscape. The presence of limestone blocks raises a multitude of sedimentary and tectonic problems, because they are outside any connection with the geological context of the area: calcareous massifs have been assigned a Jurassic age (Filipescu, 1938), while the surrounding sedimentary horizon is formed recently, in Miocene.
The occurrence of limestone has been associated with the deep part of the Carpathian geological architecture, and the hypothesis of the genesis by disaggregating some of the ridges in the Carpathian foreland basin is supported in recent studies (Frunzescu, Br?noiu, 2004), which explains that the process of advancing the Moesic Platform under the Carpathian edifice has generated dislocations that explain the up-to-to-date presence of Jurassic limestone.
Limestone blocks are strongly influenced by the dynamics of the riverbed, in particular, the process of river erosion, providing the possibility of monitoring of the way in which the river interacts with calcareous rocks and causes changes in their morphology/integrity, position and distribution within the riverbed. The characteristics of current river landscape express long-term synergy between the hydrological characteristics (flow, speed, levels) and geological characteristics. The site’s appearance is closely related to the formation and evolution of Buz?u river (Grecu et al 2021)
Mots clés : geosite|age|paleogeography|dynamics|limestone
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