Reliability of calcareous nannofossil events in the Tithonian–early Berriasian time interval: Implications for a revised high resolution zonation

Paleozoic–Mesozoic Eustatic Changes and Mass Extinctions: New Insights from Event Interpretation

“…The Jurassic/Cretaceous transition was marked by a mass extinction that, surprisingly, has been studied significantly less than many other Mesozoic biotic perturbations [ 60 , 61 ]. This scant attention can be explained partly by the still problematic stratigraphy of this transition interval (some improvements have been made very recently [ 105 , 106 , 107 ]); a sensible and well-argued suggestion (although requiring broad discussion before final approval) of the replacement of the period boundary has been made recently [ 108 ], but even this solution will not allow us to correlate better the biodiversity losses and turnovers at the planetary scale. According to the reconstruction by Haq [ 32 , 33 ], this mass extinction corresponds to several eustatic fluctuations, the magnitude of which was comparable to that of many other eustatic events of the latest Jurassic–earliest Cretaceous ( Figure S1 ).…”

Reply to Alves et al. (2022) discussion on “Stratigraphic record of continental breakup, offshoreNWAustralia” by Reeve et al. (2022)

“…For example, because biostratigraphic marker and magnetic chron ages are constantly being refined (e.g. Casellato & Erba, 2021; Robb et al, 2005), improving the resolution of these data provides a way to test our interpretations. Overall, we emphasise that our work supports a growing consensus “ that the integration of seismic reflection and well‐calibrated biostratigraphic data is critical to reading rocks that record the processes driving continental breakup ” (Reeve et al, 2022).…”

Further observations on the bio- and magnetostratigraphy of the J/K boundary interval in southern Ukraine

“…But less trust can be placed in older re sults with lower res olu tion and on data from sec tions with poor or ab er rant calpionellid re cords (e.g., Torre de ' Busi, Figs. 7 and 8;Casellato and Erba, 2021). The re li abil ity of re cords rel a tive to the calpionellid and magnetostratigraphic frame work may be as sessed us ing Fig ures 7 and 8.…”

“…4. Rep re sen ta tion of se lected nannofossil gen era in sec tions 1 and 3 in per cent ageCal car e ous nannofossils zonation fol lowsCasellato and Erba (2021)…”

“…Du pli cate spec i mens were sub jected to AF de mag ne ti za tion up to 100 mT us ing a LDA-3A demagnetizer. De mag ne ti za tion re sults were pro cessed by multicomponent anal y sis of the de mag ne ti za tion path (Kirschvink, 1980), us ing Remasoft 3.0 soft ware (Chadima and Hrouda, 2006). Mag netic sus cep ti bil ity and ani so tropy of mag netic sus cep ti bility (AMS) were mea sured on all sam ples with a MFK-1B kappabridge.…”