Abstract
The investigation is based on a subsurface sequences of bioclastic limestone in Kirkuk area, Northeastern Iraq. These sequences were deposited in a shallow open marine environment during Late Oligocene. Tests of larger foraminifera Lepidocyclina(Nephrolepidina) are abundant in the lower and upper parts of the Baba Formation. Biometric investigations of the Megalospheric forms of Nephrolepidina assemblages from, Bai-Hassan well- 25 section led to recognize three morphometrically defined species by the combination of three parameters, 1- the degree of embracement of the protoconch by the deuteroconch (Factor A), 2- the numbers of accessory auxiliary chambers on the deuteroconch (Factor B), and 3- (Factor C ) which expressed by the protoconch angle( ) formed by the two hypothetical line from the center of protoconch throught the outer attachment points of the deuteroconch walls with protoconch.
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