Abstract
The core interval at the K.H5\6 and K.H5\8 wells in the west of Rutba province reveals a significant succession across the Late Cretaceous-Early Paleocene transition. The sampled interval encompasses a series of carbonates belong to Digma Formation of Latest Cretaceous age, which underlies the Akashat Formation of Danian age. Fifty-five species belong to thirty-five genera were recognized. Based on the distribution of these species, eight biozones were distinguished, three biozones are recorded from the K.H 5\6 studied section and two biozones are documented from the K.H 5\8 studied section which refers to Late Maastrichtian age of Digma Formation. Five biozones are recorded from Akashat Formation in the K.H 5\6 studied section and only one biozone is documented from the K.H 5\8 studied section which refers to Danian age. The depositional environment of the studied successions proposed it accumulated in the outer ramp environments.
Highlights
One of the most important stratigraphic boundaries in the world is the K/Pg boundary
Through the detailed biostratigraphic study of Digma Formation and depending on the presence of planktonic foraminifera, three biozones are recorded from the K.H 5\6 studied section and two biozones are documented from the K.H 5\8 studied section
Three biozones are documented from the K.H 5\6 studied section and the latest two biozones are documented from the K.H 5\8 studied section, these biozones refer to the Late Maastrichtian age of Digma Formation
Summary
One of the most important stratigraphic boundaries in the world is the K/Pg boundary (synonymous with the K/T boundary) It expresses one of the main biological extinction catastrophes in the life history which is described by the largest Phanerozoic mass extinctions (Smit and Hertogen, 1980; Alvarez et al, 1980; MacLeod and Keller, 1996). This extinction crisis corresponds with a large asteroid impact at Chicxulub, Mexico, the Deccan flood basalt volcanism in India (Schulte et al, 2010). The Late Cretaceous-Early Paleocene succession in the Western desert of Iraq is exemplified by Digma and Akashat formations.
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