Milankovitch cyclicity in the latest Cretaceous of the Gulf Coastal Plain, USA

A new age model and chemostratigraphic framework for the Maastrichtian type area (southeastern Netherlands, northeastern Belgium)

“…This event is well constrained from open ocean records, e. g., at Walvis Ridge IODP Site 1262 (Barnet et al 2018), where it correspond with a latest Maastrichtian warming event, consistent with the position of the P. grallator acme in the type-Maastrichtian record. Although the age of KpgE-1 (~66.52 Ma) used in this study following the age models of Batenburg et al (2018) agrees well between Walvis Ridge (Barnet et al 2018) and Zumaia (Batenburg et al 2014), we note that it is slightly older compared to similar studies carried out in Gubbio (Sinnesael et al 2016;2019) and the Gulf Coastal Plain (Naujokaitytė et al 2021) that suggest an age closer to 66.4 Ma. The interval of the Maastricht Fm.…”

Geographic and temporal morphological stasis in the latest Cretaceous ammonoidDiscoscaphites irisfrom the U.S. Gulf and Atlantic Coastal Plains

“…Size and shape changes documented by other authors in planktonic foraminifera during the latest Maastrichtian, temporally equivalent to the D. iris Zone (Larina et al 2016; Naujokaitytė et al 2021; Witts et al 2021), have been related to environmental stresses associated with the emplacement of the Deccan Traps LIP, before the Chicxulub impact event and K/Pg mass extinction (Keller and Abramovich 2009; Henehan et al 2016; Gilabert et al 2021). Morphological changes have been detected in ammonoids before other mass extinction events linked to episodes of environmental change driven by LIP volcanism: for example, Kiessling et al (2018) documented a reduction in size and morphological complexity in ammonoid assemblages from deep-water limestones correlated to the last 700 kyr of the Permian in Iran, coincident with the onset of Siberian Trap LIP volcanism and disruption to the global carbon cycle, but preceding the main phase of the end-Permian mass extinction.…”

“…While these sites generally capture the range of environments that D. iris occurs in across its geographic range (Fig. 1), the species also occurs in the more carbonate-rich facies of the Prairie Bluff Chalk in Mississippi and Alabama (Larina et al 2016; Naujokaitytė et al 2021; Witts et al 2021). Unfortunately, there are currently too few complete specimens from these localities to usefully compare with siliciclastic successions.…”

“…Although its precise duration is unknown, these combined data constrain the D. iris Zone to the last 1 Myr and more likely the last ~400 kyr of the Maastrichtian. As a minimum estimate for its duration, recent cyclostratigraphic analyses in the GCP suggest the D. iris Zone could represent as little as 185 kyr (Naujokaitytė et al 2021).…”

Taxonomy and paleobiogeography of rudist bivalves from Upper Cretaceous strata, Gulf Coastal Plain and Puerto Rico, USA

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Figure 2.Summary chart compiled from previous biostratigraphic and sequence stratigraphic work from the Late Cretaceous of the Gulf Coastal Plain. ( 1 ) Chronostratigraphy based on Cohen et al (2018); ( 2, 3 ) lithostratigraphy for the West Gulf of Mexico Coastal Plain (West GCP) from the Arkansas Geological Survey (McFarland, 2004); lithostratigraphy for the East Gulf Coastal Plain (East GCP) from Mancini et al (1995), Mancini and Puckett (2005), and Naujokaitytė et al (2021); ( 4 ) foraminifera biozonations from Caron (1985), Puckett (1994, 2005), and Mancini et al (1996); ( 5 ) ostracode biozonations from Hazel and Browers (1982), Dowsett (1989), and Puckett (1994, 2005); ( 6 ) calcareous nannoplankton biozonations from Sissing (1977) and Perch-Nielsen (1985); ( 7 ) ammonite biozonations from Cobban and Kennedy (1995), Kennedy et al (1997), Cobban et al (2006), and Larina et al (2016); ( 8 ) bivalve biozonations Stephenson and Monroe (1938) and Copeland (1968); ( 9 ) transgressive-regressive cycles based on Mancini et al (1996), Puckett and Mancini (2000), and Liu (2007). Fm = formation; Grp = group; Mbr = member; Lst = limestone; T-R = transgressive-regressive; sinusoidal lines = hiatus; hash marks = well-defined hiatus.

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