Abstract
Abstract. Odontochitina tabulata, a new tabulated ceratioid species, has been recorded and described from core samples in Well C3-65 in the SE Sirte Basin. This species is characterizd by parasutural and pandasutural features reflecting clear gonyaulacacean paratabulation. It has a short stratigraphic range and is considered as a valuable stratigraphic marker for the Late Santonian–Early Campanian. The diagnosis of the genus Odontochitina Deflandre, 1935 is emended to include forms having a well defined gonyaulacacean paratabulation and narrow pandasutural and parasutural ridges.
Highlights
The presented taxon is one of many new genera and species recovered by the author during a study of the Upper Cretaceous sediments subcropping in the SE Sirte Basin, Libya
The new taxon is recovered from the Upper Cretaceous succession of Well C3-65 in the Sarir area, SE Sirte Basin (Fig. 1)
This well belongs to the Arabian Gulf Oil Company (AGOCO) Libya and was drilled by British Petroleum (BP) in 1961, and six cores were cut in the Upper Cretaceous sediments
Summary
The presented taxon is one of many new genera and species recovered by the author during a study of the Upper Cretaceous sediments subcropping in the SE Sirte Basin, Libya. The newly recorded taxa include many peridinioid and gonyaulacoid species The latter includes a distinctive tabulated ceratioid species of the genus Odontochitina Deflandre, 1935, emend. This species is recorded from three successive samples from core # 4 (depths 8517 feet, 852&8523 feet, 8524-8527 feet) which have been assigned to a Late Santonian-Early Campanian age by the author. Stover & Helby (1987), as both have a ceratioid cyst The latter differs from Odontochitina in having a circumcavate to a cornucavate cyst with variable, large periphragmal processes, whereas the former has a cornucavate to bicavate cyst with very rarely homogeneous, small, closed, spinose processes. Resembles Odontochitina but differs in having a circumcavate cyst with shorter horns and greater ornamentation
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