Abstract
The current study focused on the diagnosis of species related to gastropoda and
pelecypoda classes, mostly in the planktonic larval stage, to be used as evidence of
marine transgression in mid-Holocene. Of these, twenty of them have been recognized
for the first time in Iraq. Three bio-facies were distinguished using these species as well
as statistical grain size parameters. They are; the first bio-facies (B1) reflects the
marine transgression that occurred in the middle of the Holocene, while the second
bio-facies (B2) shows the marine regression. The third bio-facies (B3) indicates the sea
level fluctuation at the end of the Holocene.
pelecypoda classes, mostly in the planktonic larval stage, to be used as evidence of
marine transgression in mid-Holocene. Of these, twenty of them have been recognized
for the first time in Iraq. Three bio-facies were distinguished using these species as well
as statistical grain size parameters. They are; the first bio-facies (B1) reflects the
marine transgression that occurred in the middle of the Holocene, while the second
bio-facies (B2) shows the marine regression. The third bio-facies (B3) indicates the sea
level fluctuation at the end of the Holocene.