The Cretaceous-Paleogene Boundary in Southern Turkmenia and Its Geochemical Characteristics

Ammonites on the Brink of Extinction: Diversity, Abundance, and Ecology of the Order Ammonoidea at the Cretaceous/Paleogene (K/Pg) Boundary

“…An apparently complete boundary section occurs in the Sumbar River area, western Kopet Dagh, southwest Turkmenistan ). The Alekseev et al 1988;Machalski et al 2012;Tables 19.1, 19.2). These records represent the southeasternmost extent of these two (sub)species, which are otherwise known from northwest and central Europe.…”

Paleontological Characterization of the Maastrichtian and Danian Sequences in Continuous Sections in the Angyshlak Region. Part I: Macrofauna

“…Unfortunately, in the Mangyshlak region, in the limestone and coarse chalk directly overlying the "clay bed," the preservation of echinoid tests is rarely satisfactory. In this respect, the sections through the Sumbar syncline in the western Kopet-Dag region, which have been studied in detail by Alekseyev [1], are more favorable. According to his observations, the light bluish gray Upper Maastrichtian marls with Echinocorys and Hoploscaphites constrictus Sowerby are overlain by marls and limestones of the Sumbar horizon, which belongs to the Danian stage.…”