Larger benthic foraminifera from the upper part of the lower Miocene to the middle Miocene, upper Burdigalian-Serravallian (Tf1-Tf2), from previously unstudied sections in East Kalimantan are described and figured. Lepidocyclina praedelicata is described as a new species. This comprises a new ancestral link in the evolution of the Lepidocyclina from L. praedelicata in the early Miocene (Burdigalian; uppermost Te to lower Tf1) into L. delicata in the middle Miocene (Serravallian; Tf2). Analysis of the larger benthic foraminifera has allowed accurate dating of the carbonate sections studied using the East Indian Letter Classification.
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