| Summary: | Boreholes deepened mostly in the1970’s in the exploration area of the Recsk copper mine with continuous coringwere examined. Some of these cores transected especially thick Oligocene–Miocene sequence. The aim of the presentstudy is not related to ore exploration, but to review the Oligocene – Lower Miocene sedimentary sequence from otheraspects never adressed before. Such are the palaeoecological interpretation of already published faunal lists, especiallyin relation to global climate and eustatic sea level changes. Five cores of 1200 m length of Oligocene–Miocene age werechosen deepened in the 70’s, studied by the same author at the time of drilling. Collecting macrofauna and sampling werecarried out at the drill-site by the Department of Physical and Historical Geology at the Eötvös University. Furthermacroscopic studies of the cores to accomplish the earlier description noted at the drill site were carried out at the EötvösUniversity. This included the taxonomic determination of the fossil material by depth intervals, finding its relative ageand its ecological and palaeogeographic interpretation. Our results were found feasible at the time by other experts andthe gist of our results were published in several short publications at the time. The conclusions reached at the time are stilltrue, but can be improved and our new focus on palaeoclimate can contribute accomplishing new results.New contributions to understand better this Oligocene–Miocene sequence:— The age of the Kiscell Clay Formation was cross correlated and in accordance with our previous results were foundto belong to the NP 24 nannozone. The NP 21–22 zone is the time of the formation of the Recsk Andesite as proved byLESS and BÁLDI-BEKE (recently published in LESS et al. 2008).— The Lower part of the Oligocene (NP 21–22–23 zones) called Tard Clay is missing in this territory.— The infraoligocene denudation known from Transdanubia since TELEGDI-ROTH (1927) has never been found fromthe Northern Midmountains, even where the phenomenon is clearly ...
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