Macrofossil magnetobiostratigraphy for the upper Santonian–lower Campanian interval in the Western Interior of North America: comparisons with European stage boundaries and planktonic foraminiferal zonal boundaries

Leahy, Guy D.; Lerbekmo, J. F.

doi:10.1139/e95-020

Cited by 29 publications

(6 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Correlation of events in the middle to middle upper Santonian of Europe, such as the Horseshoe Bay and Hawks Brow, may be problematic because the endemic nature of some biozone taxa (Lamolda and Hancock 1996) introduces greater uncertainty into biostratigraphic correlation of between Europe and the Western Interior. For example, the base of the upper Santonian was defined on first occurrence of the cosmopolitan Uintacrinus socialis Grinnell (Gale et al 1995) in European successions, but the Western Interior appearance of this crinoid has been described as time-transgressive (Leahy and Lerbekmo 1995).…”

Section: Global Correlationmentioning

confidence: 99%

Cenomanian To Campanian Carbon Isotope Chemostratigraphy from the Western Interior Basin, U.S.A

Joo¹,

Sageman²

2014

Journal of Sedimentary Research

120

111

View full text Add to dashboard Cite

Late Cretaceous carbon isotope curves generated for localities in Europe, Asia, and the deep-sea records have provided the foundation for development of a contiguous, intercontinental chemostratigraphic framework. Despite the development of carbon isotope records from selected stratigraphic intervals in the Western Interior Basin, however, a comprehensive d 13 C record comparable to those developed in Europe and Asia, and from ODP sites, had not yet been completed. This study reports a new, high-resolution Cenomanian to Campanian carbon isotope record for the central Western Interior Basin of North America that makes a key contribution to the intercontinental correlation. The curve is correlated to the well-developed molluscan biostratigraphic framework for the Western Interior Basin, as well as a revised geochronology based on integration of new radioisotopic dating and astrochronology developed in the same core records from where the d 13 C data were derived. The new d 13 C record reflects not only major perturbations in the global carbon cycle, such as the midCenomanian Event and the Cenomanian-Turonian Ocean Anoxic Event 2, but also smaller excursions that have been recognized in records from Europe and Asia. This shows that the Western Interior shallow epeiric sea was not isolated for any appreciable part of Cenomanian to early Campanian time-it consistently recorded changes in the global marine carbon cycle observed elsewhere. A critical attribute of the chemostratigraphic dataset produced in this study is its linkage with a revised Late Cretaceous time scale. Assignment of revised ages to Western Interior carbon isotope events that are globally expressed will allow export of the improved time scale to localities within and outside the Western Interior where similar carbon isotope records have been generated. This chronostratigraphic tool will allow a number of stratigraphic and geochemical hypotheses to be more rigorously tested.

show abstract

Section: Global Correlationmentioning

confidence: 99%

Cenomanian To Campanian Carbon Isotope Chemostratigraphy from the Western Interior Basin, U.S.A

Joo¹,

Sageman²

2014

Journal of Sedimentary Research

120

111

View full text Add to dashboard Cite

show abstract

“…This member consists of alternating sandstones and siltstones with intermittent coal, interpreted as fluvial channel and floodplain deposits, respectively. The member is up to 70 m thick (Leahy and Lerbekmo 1995), although no single outcrop exposes the full vertical extent of the unit. Vertebrate fossils are known from the lower 35 m of the Deadhorse Coulee Member and those Neurankylus lithographicus sp.…”

Section: Geologic Settingmentioning

confidence: 99%

“…nov. specimens with known stratigraphic provenance occur only from 8.0 to 26.5 m above the base of the member. Although the maximum age of the unit is poorly constrained, the 34n-33r magnetochron boundary has been noted at 38 m above the base of the Deadhorse Coulee Member (Leahy and Lerbekmo 1995) and this boundary has …”

Section: Geologic Settingmentioning

confidence: 99%

A New Species of Neurankylus from the Milk River Formation (Cretaceous: Santonian) of Alberta, Canada, and a Revision of the Type Species N. eximius

Larson

Longrich

Evans

et al. 2012

Vertebrate Paleobiology and Paleoanthropology

View full text Add to dashboard Cite

A new species of Neurankylus (N. lithographicus sp. nov.) is described on the basis of skull and shell material from the Santonian-aged Milk River Formation, Alberta, Canada. The genus Neurankylus is also rediagnosed on the basis of the Milk River material and on new material pertaining to the type species N. eximius. N. eximius previously was considered to be a long-lived and cosmopolitan taxon. New Neurankylus material provides insights into the range of morphological variation present in the genus and indicates that many specimens previously referred to N. eximius may belong to different species. The congeners recognized in this chapter have a more restricted geographical and temporal range than has been suggested previously. A new phylogenetic analysis of all known baenid taxa, including all described species of Neurankylus and several basal paracryptodiran taxa of uncertain affinities, yields two important results: a monophyletic Neurankylus is recovered as a basal radiation within Baenidae and parallel evolution is identified among many features previously regarded as synapomorphies for Baenidae. In light of this study and other recent work on turtle systematics, it is now apparent the biogeography and biostratigraphy of Cretaceous turtles may have been more complex than previously appreciated.

show abstract

“…Moreover, even in the case of one and the same paleobiochoria situation the boundaries of the same biostratigraphic units are more or less asynchronous. The legitimacy of the latter is demonstrated here not only for the case of the Aptian ammonite zones, but also in a number of other publications [Channell and Erba, 1992;Leahy and Lerbekmo, 1995]. In terms of these results, zones cannot be used as the main units of the General Stratigraphic Scale (GSS), because differences in the absolute time between the bases of identical zones in different regions are comparable with the stratigraphic volumes of the zones themselves.…”

Section: Diachronism Of the Boundaries And The Generation Of The Genementioning

confidence: 63%

New paleomagnetic data for the Hauterivian-Aptian deposits of the Middle Volga region: A possibility of global correlation and dating of time-shifting of stratigraphic boundaries

Guzhikov¹,

Birbina²,

Baraboshkin³

2004

Russ. J. Earth Sci.

View full text Add to dashboard Cite

The aim of this project was to study the paleomagnetic stratigraphy of the Hauterivian-Aptian deposits in the Middle Volga region, namely in the areas of the Saratov, Samara, and Uliyanovsk right-hand Volga areas. Original data were obtained for the first time for the magnetic polarity of the Hauterivian and Barremian rocks of the Russian Platform. The results obtained for the Aptian rocks agree very well with the results of the previous paleomagnetic studies which had been carried out in the Uliyanovsk region earlier [Baraboshkin et al., 1999] and in the vicinities of Saratov City [Grishanov, 1984]. Based on the complex correlation of the bio-and magnetostratigraphic data for the rocks from the Middle Volga region, the North Caucasus, the North Mediterranean area, and South England, it is shown that the stage and substage boundaries of the Hauterivian, Barremian, and Aptian stages differ in terms of the absolute age from the similar boundaries in the Boreal Belt by a value of some 10 5-10 6 years, which is comparable with the duration of the Early Cretaceous ammonite zones. The diachronism of the Lower Aptian ammonite zones (Deshayesites volgensis-D. forbesi) and of the Middle Aptian Parahoplites melchioris zone in different regions. The results of this study called for a complex substantiation and tracing of the units of the General Stratigraphic Scale (GSS). The basic GSS unit must be a stage, rather than a zone, because where boundaries were traced over a large territory, the asynchronism of the boundaries between the zones is comparable with the duration of the zones, whereas in the case of a stage it is 1-2 orders of magnitude lower. Geomagnetic inversions or isotopic data can be used to test the isochronism of stratigraphic boundaries.

show abstract

Macrofossil magnetobiostratigraphy for the upper Santonian–lower Campanian interval in the Western Interior of North America: comparisons with European stage boundaries and planktonic foraminiferal zonal boundaries

Cited by 29 publications

References 39 publications

Cenomanian To Campanian Carbon Isotope Chemostratigraphy from the Western Interior Basin, U.S.A

Cenomanian To Campanian Carbon Isotope Chemostratigraphy from the Western Interior Basin, U.S.A

A New Species of Neurankylus from the Milk River Formation (Cretaceous: Santonian) of Alberta, Canada, and a Revision of the Type Species N. eximius

New paleomagnetic data for the Hauterivian-Aptian deposits of the Middle Volga region: A possibility of global correlation and dating of time-shifting of stratigraphic boundaries

Contact Info

Product

Resources

About