The lower part of the Qulqula (Radiolarian) Formation is studied in the Thrust Zone,
Northeast Iraq (Kurdistan Region). The lower part consists of alternation of four detrital
limestone successions (each about 25 m thick) with thick intervals of bedded chert and
shale. The limestones are mainly of distinctly bedded and shallow marine in origin. The four
successions have nearly the same lithology of peloid, ooid, lithoclastic and bioclastic
grainstone and packstone, with rare mudstone and wackstone. The matrix consists mostly of …

The lower part of the Qulqula (Radiolarian) Formation is studied in the Thrust Zone,
Northeast Iraq (Kurdistan Region) near the border with Iran. The lower part consists of
alternation of more than four detrital limestone successions) each about 25 m thick (with
thick intervals of bedded chert and shale. The limestones are mainly of distinctly bedded and
shallow marine in origin. The four successions have nearly the same lithology of peloid,
ooid, lithoclastic and bioclastic grainstone and packstone, with rare mudstone and …