Veres János: A bükkábrányi 8 millió éves mocsárerdő (Múzeumi Mozaik 7. Miskolc, 2007)

however, there is a total absence of fossilization in the surrounding deposit, and in an airtight environment the rotting and decomposition did not happen thus preserving such marvelous section of the multimillion- years old world for us. And now, having discussed the taphonomicalprocesses, lets see what caused the geological changes. 20 million years ago, the then active, vulcanic Mátra Mountain destroyed the forest of Ipolytarnóc and the classic fossil diagenesis processes are evident in the findings. In contrast, what happened during the Miocene in Bükkábrány is very different. Tectonic movements may have caused the disastress landslide that covered the entire region in earth or silt. According to a previous theory sudden winds may have deposited the coastal sand dunes in the swamp. However, by closer studying the geological sections and the deposited sand we rind evidence of waves and water locomotion. Therefore the first hypothesis is probably wrong. The surface of the deposited sand particals are shiny, hardly weathered or worn so as a conclusion the sand came from close by and was most likely carried by a river. (Sea sand is well worn). There is also the presence of gravel along with the sand which shows evidence of the power and force of the water. Sizable gravel layers were shifted around which is probably the result of large scale depositing in a river delta. In that case the river itself might drastically changed course and with the vulcanic acticity in the region it is consievable how a river, having been obstructed, might had to find a new riverbed. The deposition of the gravel layers is directional and showing a north-to-south movement in the upper Miocene. This brings up the likelyhood of some chatastrophical burial between the Pannon Sea and its northern shoreline. •12