Some researchers since 1935 (Jongmans and Gothan) and Li and Yao (1982), Li (19,995), Righby (1998), Fauzie (2005) have produced information paleonto logy and geology that Mengkarang formation is dominated by volcanic activity in the form of deposits lava, lava, the flow of dust, dust fall-out, ground sediment (rivers, plains, flood) with insertions in marine sediment mark by the fusulina krinoid, emonit and brakiopoda in limestone and shale-old fossil Gampingan the 250 to 290 million years of now.
