The outcrop of the Bataszek brickyard in southeastern Transdanubia of Hungary exposes
clayey silt in a 20 to 30 m thickness, containing several thin, sandy, often limonitic,
poorly sorted coquina layers. We interpret the silt as sublittoral deposit of the
Late Miocene Lake Pannon. The sandy intercalations are probably storm deposits or
sediment gravity flows from a nearby littoral environment. The mollusk fauna of the
silt is largely autochthonous, and dominated by Congeria rhomboidea and Lymnocardium
hungaricum. The partly reworked faunas of the sandy intercalations have a different
composition. The entire fauna is very similar to the classic faunas of Okrugljak and
Szekszard, and to the fauna of Jazovnik (faciostratotype of the Portaferrian Substage).
All of these deposits belong to the Congeria rhomboidea Zone. Other fossils from the
outcrop include ostracods, fishes, algae, spores, and pollen. The dinoflagellates
indicate that the Bataszek deposits are in a slightly higher stratigraphic position
than the top of the Spiniferites validus Zone.