The biostratigraphy and paleobiogeography of Maastrichtian inoceramids

MacLeod, Kenneth G.; Huber, Brian T.; Ward, Peter D.

doi:10.1130/0-8137-2307-8.361

Cited by 31 publications

(19 citation statements)

References 44 publications

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“…This diversity minimum is followed by a general increase starting 532 around 500 m above the section base, up until a level~50 m below the K-Pg boundary. Most studies of environmental changes during the MME focus on extinction and/or reduction 554 in diversity of groups such as inoceramid bivalves (Macleod, 1994;Macleod et al, 1996) and rudist 555 bivalve-dominated tropical reefs (Johnson and Kauffman, 1996), but our data suggest that in 556…”

Section: Maastrichtian Faunal Diversity and Environmental Change On Smentioning

confidence: 75%

Evolution and extinction of Maastrichtian (Late Cretaceous) cephalopods from the López de Bertodano Formation, Seymour Island, Antarctica

Witts

Bowman

Wignall

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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8One of the most expanded records to contain the final fortunes of ammonoid cephalopods is within 9 the López de Bertodano Formation of Seymour Island, James Ross Basin, Antarctica. Located at~65º 10 South now, and during the Cretaceous, this sequence is the highest southern latitude onshore outcrop 11 containing the Cretaceous-Paleogene (K-Pg) transition. We present comprehensive new 12 biostratigraphic range data for 14 ammonite and one nautiloid species based on the collection of >700 13 macrofossils from high-resolution sampling of parallel sedimentary sections, dated Maastrichtian to 14 earliest Danian in age, across southern Seymour Island. We find evidence for only a single, abrupt 15 pulse of cephalopod extinction at the end of the Cretaceous when the final seven ammonite species 16 disappeared, consistent with most evidence globally. In the lead up to the K-Pg extinction in the 17 James Ross Basin, starting during the Campanian, ammonite diversity decreased overall, but the 18 number of endemic taxa belonging to the family Kossmaticeratidae actually increased. This pattern 19 continued into the Maastrichtian and may be facies controlled, linked to changes in sea level and 20 seawater temperature. During the early Maastrichtian, ammonite diversity dropped significantly with 21 only two species recorded from the basal López de Bertodano Formation on Seymour Island. The 22 subsequent diversification of endemic taxa and reappearance of long-ranging, widespread species into 23 the basin resulted in an increase in ammonite diversity and abundance during the mid- Maastrichtian. 24 This was coincident with an apparent period of warming temperatures and sea level rise interpreted 25 from palynology and sedimentology, perhaps reflecting a high latitude expression of the Maastrichtian Event. Late Maastrichtian diversity levels remained stable despite reported climatic and 27 environmental variation. Ammonite diversity patterns during the Maastrichtian parallel those of 28 microfossil species such as nannofossil and planktonic foraminifera, suggesting that dynamic climatic 29 and environmental changes affected many planktonic and nektonic organisms during the latest 30Cretaceous. However, we suggest that these perturbations had a minimal effect on overall diversity 31 prior to the catastrophic extinction event at the K-Pg boundary. 32 33 3 Key words: Cretaceous; palaeoenvironments; ammonite; extinction; Antarctica; diversity. 34 35 1.Introduction 36The final demise of the ammonoid cephalopods at the end of the Cretaceous is a key 37 component of the ongoing debate about the nature of the Cretaceous -Paleogene (K-Pg) boundary 38 mass extinction event of 66 Ma (Gallagher, 1991;Ward et al., 1991;Marshall and Ward, 1996). 39Whether this event was caused by the devastating impact of an extra-terrestrial object (Alvarez et al., 40 1980; Schulte et al., 2010; Renne et al., 2013), or was drawn out through the final few million years of 41 the Cretaceous, with other factors such as climate and sea level cha...

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Section: Maastrichtian Faunal Diversity and Environmental Change On Smentioning

confidence: 75%

Evolution and extinction of Maastrichtian (Late Cretaceous) cephalopods from the López de Bertodano Formation, Seymour Island, Antarctica

Witts

Bowman

Wignall

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Biozonation is based on planktic foraminifera [ Bralower et al ., ] and calcareous nannofossils [ Lees and Bown , ]. Sections 198‐1210B‐28‐4 and 28‐6 (260.73–264.12 m bsf) document a short interval with abundant shell debris of inoceramids [ Bralower et al ., ], which is considered to represent ocean‐wide changes in circulation [ MacLeod et al ., ].…”

Section: Geological Settingmentioning

confidence: 99%

“…The CMBE has been recorded at different open oceanic sites in the tropical Pacific, Indian, South Atlantic, and Southern Oceans [ Barrera et al ., ; Barrera and Savin , ; Frank and Arthur , ; Friedrich et al ., ; Voigt et al ., ; Jung et al ., ; Thibault et al ., ; Voigt et al ., ], as well as in epicontinental seas surrounding the North Atlantic Ocean [e.g., Odin and Lamaurelle , ; Jarvis et al ., ; Jarvis et al ., ; Voigt et al ., ; Voigt et al ., ]. Slightly younger than the CMBE, the Mid‐Maastrichtian event (MME) marked the termination of the early Maastrichtian cooling trend and was associated with acme occurrences of inoceramids in intermediate water depths prior to the extinction of this group of organisms during the mid‐Maastrichtian [ MacLeod et al ., ]. The causal mechanisms of these changes in climate and the global carbon cycle are still a matter of debate, and controversial hypotheses exist.…”

Section: Introductionmentioning

confidence: 99%

Campanian‐Maastrichtian ocean circulation in the tropical Pacific

et al. 2013

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[1] The Pacific Ocean is the largest water body on Earth, and circulation in the Pacific contributed significantly to climate evolution in the latest Cretaceous, the culmination of a period of long-term cooling. Here, we present new high-resolution late Campanian to Maastrichtian benthic and planktic foraminiferal stable isotope data and a neodymium (Nd) isotope record obtained from sedimentary ferromanganese oxide coatings of Ocean Drilling Program Hole 1210B from the tropical Pacific Ocean (Shatsky Rise). These new records resolve 13 million years in the latest Cretaceous, providing insights into changes in surface and bottom water temperatures and source regions of deep to intermediate waters covering the carbon isotope excursions of the Campanian-Maastrichtian Boundary Event (CMBE) and the Mid-Maastrichtian event (MME). Our new benthic foraminiferal δ 18O and Nd isotope records together with published Nd isotope data show markedly parallel trends across the studied interval over a broad range of bathyal to abyssal water depths interpreted to reflect changes in the intensity of deep-ocean circulation in the tropical Pacific. In particular, we observe a three-million-year-long period of cooler conditions in the early Maastrichtian (72.5 to 69.5 Ma) when a concomitant change toward less radiogenic seawater Nd isotope signatures probably marks a period of enhanced admixture and northward flow of deep waters with Southern Ocean provenance. We suggest this change to have been triggered by intensified formation and convection of deep waters in the high southern latitudes, a process that weakened during the MME (69.5 to 68.5 Ma). The early Maastrichtian cold interval is closely related to the negative and positive carbon isotope trends of the CMBE and MME. The millions-of-years long duration of these carbon cycle perturbations suggests a tectonic forcing of climatic cooling, possibly related to changes in ocean basin geometry and bathymetry.

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“…The CMBE is characterized by distinct changes in stable oxygen and carbon isotope records, indicating deep-water cooling and changing rates of global organic carbon burial (e. g., Barrera et al 1997, Frank and Arthur 1999, Barrera and Savin 1999, Friedrich et al 2004, 2009, Frank et al 2005, Friedrich and Hemleben 2007. Shortly after the CMBE, the Mid-Maastrichtian Event (MME; recognized in the North Atlantic by MacLeod et al 1996) marks a time of deep-sea warming (e. g. in the Tropical Pacific; Jung et al 2013) and an inoceramid extinction event in numerous open-ocean sites (e. g., MacLeod 1994, Mac -Leod et al 1996. The last 400 kyr of the Cretaceous are characterized by a strong oscillation in carbon isotope records (Voigt et al 2012), accompanied by a pulse of global warming, as recognized in bulk carbonate oxygen isotope records and foraminiferal and nannofossil assemblages (Barrera 1994, Li and Keller 1998, Thibault et al 2007, 2016b, as well as in terrestrial records (Wilf et al 2003).…”

Section: Introductionmentioning

confidence: 99%