Abstract
The present study included identification and systematic description of some ammonites from the upper part of Chia Gara Formation, on the southern limb of Maten anticline at Amadia area, northern Iraq. Six species belong to five genera and three families were described. The two species; Berriasella privasensis and Parodontoceras calistoides were previously identified, and four species were left under open nomenclature, due to bad preservation and lack of material, these are; Parodontoceras sp., Spiticeras (Kilianiceras) sp., Substeueroceras sp. and Haploceras sp. The studied ammonites occur as an assemblage fauna in the Durangites Zone, which indicates Late Tithonian age for the upper part of Chia Gara Formation in the Amadia area..
Highlights
The studied section is located at the southern limb of Maten anticline, about (2 km) northeastern Amadia area
The aim of the present study is to identify and describe ammonite fauna from Chia Gara Formation (Fig. 2), in order to obtain the age of the studied section
Occurrence: The current species was described from late Tithonian by Moore (1957), and it is identified in this study in the upper part of Chia Gara Formation
Summary
The studied section is located at the southern limb of Maten anticline, about (2 km) northeastern Amadia area. Tithonian-Berriasian) was first defined by Wetzel (1950 in Bellen et al, 1959) at the Chia Gara anticline, south of Amadia town in the high folded zone of north Iraq. The studied section is composed about 90m thick of alternation beds of pale to dark brown shale and white-yellowish limestone (the lithological description of the studied section is shown in (Fig. 2). The lower boundary is sharp between the tough dolostone of Barsarin Formation (Late Kimmeridgian) and thin bedded limestone of Chia Gara Formation, without any indication of unconformable evidences. The aim of the present study is to identify and describe ammonite fauna from Chia Gara Formation (Fig. 2), in order to obtain the age of the studied section
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