First recovery of late Early Triassic (Spathian) pelagic assemblages (radiolarians and conodonts) from block in the Upper Karakaya Complex near Ankara City, central Turkey: Biostratigraphical remarks and correlation

Kamata, Yoshihito
Krystyn, Leopold
Okuyucu, Cengiz
Sayıt, Kaan
Nalbantli, Mustafa
The Upper Karakaya Complex, belonging to the Karakaya Complex, includes different blocks and tectonic slices within a Triassic sheared matrix. This wide-spread unit mainly exposed in northern Turkey also crops out to the southern part of Ankara city near Gokcehuyuk village. Instead of a continuous sequence of Carboniferous to Permian age described in a previous study, five different blocks of various origins and ages are identified in this study. One of the pelagic blocks composing of cherty limestone includes radiolarian and conodont assemblages typical of Spathian age, representing the Triassospathodus homeri Conodont Zone. It corresponds also to the Hozmadia ozawai Radiolarian Zone although the zonal guide could not be obtained from the radiolarian assemblage. This is so far the first recovery of pelagic assemblages (radiolarians and conodonts) from the Karakaya Complex. This result clearly indicates that pelagic sedimentation took place in the Karakaya Complex during late Early Triassic time. Compared to previous studies, it can be stated that radiolarian cherts have been deposited in the Karakaya Complex in two different time span from Middle to Late Devonian and Late Permian (Changhsingian) to early Late Triassic (Carnian) time, respectively.


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The Mersin Mélange (MM) as a part of the Mersin Ophiolitic Complex is a sedimentary complex including blocks and tectonic slices of oceanic litosphere and continental crust of various sizes. MM is mainly located to the north and northwest of city of Mersin in southern Turkey. Based on studies on four stratigraphic sections (the Cakalkayrak, the Aliclipinar-Southwest, the Sorgun-South and the Kocatepe-South) from either blocks or tectonic slices in MM reveals the presence of succ...
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The Mersin Melange (MM) as a part of the Mersin Ophiolitic Complex in southern Turkey is a sedimentary complex including blocks and tectonic slices within a Late Cretaceous matrix. Two blocks (Keven and Cingeypinari) within the MM originated from the northern branch of Neotethys (Izmir-Ankara-Erzincan Ocean) and have been studied in detail using foraminiferal assemblages to correlate them with coeval successions in the Taurides and to approach the Early Permian evolution of the northern branch of the Neotet...
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Citation Formats
U. K. TEKİN, Y. Kamata, L. Krystyn, C. Okuyucu, K. Sayıt, and M. Nalbantli, “First recovery of late Early Triassic (Spathian) pelagic assemblages (radiolarians and conodonts) from block in the Upper Karakaya Complex near Ankara City, central Turkey: Biostratigraphical remarks and correlation,” JOURNAL OF AFRICAN EARTH SCIENCES, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: