• Title/Summary/Keyword: Cyclestherioides

Search Result 1, Processing Time 0.016 seconds

Fossil Conchostraca from the Amisan Formation of the Nampo Group, Korea (남포층군의 아미산층에서 산출된 패갑류 화석)

  • Kim, Jong-Heon;Lee, Gui-Hyeong
    • Journal of the Korean earth science society
    • /
    • v.36 no.2
    • /
    • pp.181-189
    • /
    • 2015
  • A large number of fossil conchostraca used in this study were collected from the Amisan Formation distributed in the western part of Chungnam, Korea. These fossils were densely discovered in several horizons of the Amisan Formation, and might have flourished in the fresh water environment of subtropical climate. The fossil conchostraca from the Amisan Formation were classified into four species belonging to three genera as follows: Euestheria kawasakii, E. shimamurai, Sphaerestheria koreanica, and Cyclestherioides rampoensis. Out of four species, the last species was previously described from the Amisan Formation, and the other three species were newly found. Based on the fossil conchostraca, it is inferred that the geological age of the Amisan Formation falls under the Late Triassic Period.