Peculiar monospecific euryhalin ostracod fauna with great numbers of moderately to well-preserved carapaces were extracted from lower Anisian bituminous laminates of lower part of Iszkahegy Limestone exposed on northern slope of Szentkereszthegy in Balaton Highland, Hungary. The ostracod assemblage suggests subtidal restricted lagoonal environment with brackish, dysoxic bottom water conditions due to the weak vertical circulation in the water column. The freshwater input in to the basin can be explained probably by a moist period in the climate during the Anisian
