Abstract
Two new species of calcareous nannofossils from Jaddala Formation, type section, Northwestern Iraq
Highlights
Kingdom ProtistaGenus Chiasmolithus Hay and Wade, 1966 Type species: Tremalithus oamaruensis Defladre and Ferth, 1954; Ann
Jaddala Formation was first described by Henson, 1940 near Jaddala village at southern limb of Sinjar anticline NW Iraq, it is about 342 m. in thickness and consisting of marly Limestone, chalky Limestone and Marlstone [5]
Where in the cross in the central area of this study of mostly straight in addition to being smaller size. this species were identified by Mahmood, 2011 and age determined in middle Eocene, and in this study determined Middle Eocene (Lutetian)
Summary
Genus Chiasmolithus Hay and Wade, 1966 Type species: Tremalithus oamaruensis Defladre and Ferth, 1954; Ann. Type locality and Stratum: Northwestern Iraq, the type section near Jaddala village at the southern limb of Sinjar Anticline, Jaddala Formation from Marly Limestone from sample No (21, 22, 23), where located at 134-148 from the lower boundary. Discussion: this species is different from the rest of species genus Chiasmolithus Hay and Wade, 1966 being very small in size, this species similar to some extent species Chiasmolithus titus Gartner, 1970 but the latter species differs being the central area giving of cross (x) one being straight and oblique to turn of the long axis to the coccolith, while the second transverse (S) shaped which extends and parallel to the short axis of the coccolith. Type locality and Stratum: Northwestern Iraq, sinjar area the type section near Jaddala village at the southern limb of Sinjar Anticline, which composed of from Marly Limestone from sample no. Triplets rotate through evolution to become parallel giving triradiate nannolith with bifurcate ray tips
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