Formation

Biozone

Age

Basal limestones of the Asmari Formation

56. Lepidocyclina-Opercolina-Ditropaassemblage zone

Oligocene?

Lower Part of Asmari Formation

57. Nummulites intermedius-Nummulites vascus assemblage zone

Oligocene

Lower Part of Asmari Formation

58. Archaias operculiniformis totalrange zone Oligocene

Middle Part of Asmari Formation ―Lowest Levels of the Gachsaran Formation

59. Austrotrillina howchini-Peneroplis evolutus assemblage zone

60. Austrotrillina howchini-Peneroplis evolutus (Gachsaran Fm.)

Lower Miocene (Aquitanian)

Upper Part of Asmari Formation―Lower Parts of the Gachsaran and Razak Formations

61, 62. Borelis melo curdica zone

Lower Miocene (Burdigalian)