The Jurassic /Cretaceous boundary beds in Kurdistan – a preliminary note on wider correlations

Abstract

Ammonites, nannofossils and calpionellids have been studied from Chia Gara Formation at Banik village (Zakho area, Dohuk Governorate, Kurdistan). New micropalaeontological work at Banik makes it possible for the first time to identify useful western Tethyan Jurassic /Cretaceous boundary marker species (calpionellids and nannofossils) and to make precise correlations with the boundary interval in Europe and elsewhere. Kurdistan at the end of the Jurassic was positioned on the south side of Tethys, on the opposite side of that ocean from the type sites and regions for the Tithonian and Berriasian stages.

The proposal of a GSSP for the Berriasian Stage (Cretaceous System): Part 2

“…In the last ten years the work of the Berriasian group, focussed solely on the search for a GSSP, has greatly expanded our knowledge and the data we can bring to bear on the age-old J/K boundary problem, as the literature derived from the group, and a wider circle of comrades, bears witness (Guzhikov, Baraboshkin, 2008;Wimbledon, 2008Wimbledon, , 2014Wimbledon, , 2017Boughdiri et al, 2009;Michalík et al, 2009Michalík et al, , 2016Pessagno et al, 2009;Pszczółkowski, 2009Pszczółkowski, , 2013Pszczółkowski, , 2016Reháková et al, 2009Reháková et al, , 2011Rogov, Zakharov, 2009;Ben Abdesselam-Mahdaoui et al, 2010Casellato, 2010;Channell et al, 2010;Dzyuba, 2010Dzyuba, , 2012Dzyuba, , 2013Grabowski, 2010;Grabowski et al, 2010aGrabowski et al, , b, 2014Grabowski et al, , 2016Grabowski et al, , 2019Lukeneder et al, 2010;Pruner et al, 2010;Rogov, 2010;Harding et al, 2011;Kietzmann et al, 2011Kietzmann et al, , 2018aMichalík, Reháková, 2011;Pestchevitskaya et al, 2011;Sallouhi et al, 2011;Wimbledon et al, 2011Wimbledon et al, , 2013Wimbledon et al, , 2016Wimbledon et al, , 2017Wimbledon et al, , 2020aŽák et al, 2011;Arkad'ev et al, 2012Arkad'ev et al, , 2015Benzaggagh et ...…”