Paleoenvironmental changes in the Cretaceous (Albian to Turonian) Colorado Group of western Canada: microfossil, sedimentological and geochemical evidence

Schröder-Adams, Claudia J.; Leckie, Dale A.; Bloch, John; Craig, Jim; McIntyre, David J.; Adams, P. J.

doi:10.1006/cres.1996.0022

Cited by 67 publications

(74 citation statements)

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“…Maximum transgression, which occurred from the latest Cenomanian to early Turonian, created fully marine conditions and allowed the establishment of a Tethyan fauna in the Canadian portion of the WIS (Schröder-Adams et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

Track analysis of the marine palaeofauna from the Turonian (Late Cretaceous)

Gallo¹,

Cavalcanti

Silva

2007

Journal of Biogeography

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Aim To analyse the worldwide distribution patterns of Turonian marine biotas using a panbiogeographical approach. Location Turonian localities of southern and north‐eastern Brazil, Mexico, Canada, central Europe, England and Morocco. Method Panbiogeographical track analysis. Results Nine generalized tracks and six nodes were found. The generalized tracks comprise two vicariant track patterns (one northern and one mid‐southern) across the Atlantic. Main conclusions The generalized tracks show clearly two separate marine biotas, which were associated with the proto‐South Atlantic and the proto‐North Atlantic oceans. These generalized tracks, as well as the two vicariant track clusters between the north and south Atlantic, are identified by vicariant relationships shared by most of the taxa analysed, and illustrate the final break up of the Gondwana and Laurasia supercontinents and the consequences of vicariant events for the biogeography of the Atlantic Ocean.

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Section: Discussionmentioning

confidence: 99%

Track analysis of the marine palaeofauna from the Turonian (Late Cretaceous)

Gallo¹,

Cavalcanti

Silva

2007

Journal of Biogeography

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“…Tyagi et al (2007) showed that, in well logs, the X bentonite could be traced northward into silty offshore strata of Dunvegan allomember C, but the bentonite became unrecognizable in the sandy nearshore facies, presumably as a result of erosion and reworking in shallow water. The X bentonite was, therefore, deposited close to the end of the regressive phase of Dunvegan deposition in the late middle Cenomanian and just prior to major marine transgression that culminated in the early Turonian in the most extensive flooding of the Cretaceous Western Interior Basin (Caldwell et al 1978;Schröder-Adams et al 1996). This eustatic highstand is recorded in Alberta by distinctive, grey-weathering mudstone-dominated strata of the Vimy Member of the Blackstone Formation (Fig.…”

Section: Bentonitementioning

confidence: 99%

“…2). In outcrop, the lithostratigraphic boundary between the Sunkay and Vimy members is marked by an abrupt change from rusty-weathering, thinly interbedded mudstone, siltstone, and very fine-grained sandstone to grey-weathering laminated siltstone and mudstone; this facies change records significant deepening of the interior seaway (Stott 1963;Schröder-Adams et al 1996;Tyagi et al 2007). Unfortunately, neither the latest Cenomanian ammonite Neocardioceras juddii nor the earliest Turonian ammonite Watinoceras devonense have been recorded in Alberta.…”

Section: Fig 2 Regional Well-log Correlation From Outcrop On Burnt mentioning

confidence: 99%

High-precision U–Pb zircon ID–TIMS dating of two regionally extensive bentonites: Cenomanian Stage, Western Canada Foreland BasinThis article is one of a series of papers published in this Special Issue on the theme ofGeochronologyin honour of Tom Krogh.

et al. 2011

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The stratigraphy of Cretaceous rocks in the Western Canada Foreland Basin is well constrained by dense borehole data that allow three-dimensional mapping of transgressive-regressive events, paleogeography, and subsidence patterns. However, it is difficult to estimate rates of change or to place events in a precise temporal framework because very few of the many bentonite beds have been dated using modern techniques. In this study, two bentonites, of at least regional extent, were dated using isotope dilution -thermal ionization mass spectrometry (ID-TIMS) U-Pb methods on chemically abraded zircon crystals. The older bentonite correlates with the ''X'' bentonite of the late middle Cenomanian and yields an age of 95.87 ± 0.10 Ma. The Bighorn River Bentonite, which lies just below the Cenomanian-Turonian boundary, yields an age of 94.29 ± 0.13 Ma and is interpreted to equate with the ''B'' bentonite and bed 80 at Pueblo, Colorado. Both bentonites dated here are older than the previously reported 40 Ar/ 39 Ar ages from correlative United States samples, supporting the observation that 40 Ar/ 39 Ar ages may systematically underestimate ages of Cretaceous bentonites by *1%, as suggested by other recent studies. The X bentonite immediately precedes a major late middle Cenomanian eustatic transgression that inundated the Dunvegan delta complex. The new ages for the X and Bighorn River bentonites indicate an average minimum subsidence rate of *0.27 mm/year in the most proximal part of the Cenomanian foredeep in northeast British Columbia during this time. The new age of the Bighorn River Bentonite, coupled with the orbitally tuned time scale of Sageman et al. (2006), suggests a Cenomanian-Turonian boundary age of 94.12 ± 0.13 Ma.Résumé : La stratigraphie des roches du Crétacé dans le bassin d'avant-pays de l'Ouest du Canada est bien délimitée par de nombreuses données de trous de forage qui permettent une cartographie en trois dimensions des événements de transgression-régression, de la paléogéographie et des patrons de subsidence. Toutefois, il est difficile d'estimer les taux de changement ou de placer des événements dans un cadre temporel précis puisque très peu des nombreux lits de bentonite ont été datés par des techniques modernes. Dans la présente étude, deux bentonites, d'étendue au moins régionale, ont été datées par les méthodes ID-TIMS [dilution isotopique et spectrométrie de masse à thermoionisation] U-Pb sur des cristaux de zircon abrasés chimiquement. La bentonite la plus ancienne a été corrélée avec la bentonite « X » du Cénomanien moyen tardif et a donné un âge de 95,87 ± 0,10 Ma. La bentonite Bighorn River, qui se trouve tout juste sous la limite Cé-nomanien-Turonien, a donné un âge de 94,29 ± 0,13 Ma et elle est interprétée comme équivalente à la bentonite « B » et le lit 80 à Pueblo, au Colorado. Les deux bentonites datées ici sont plus anciennes que les âges 40 Ar/ 39 Ar rapportés anté-rieurement d'échantillons corrélatifs provenant des É tats-Unis, supportant l'observation que les âges 40 Ar/ 39 Ar pu...

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“…This interval belongs to the Middle Turonian Hedbergella loetterlei zone characteristic of the Greenhorn Formation in the United States and the Second White Specks Formation in southern Alberta and Saskatchewan (Cobban et al, 1959;Bloch et al, 1993;Schröder-Adams et al, 1996). as the main components.…”

Section: Age and Correlation Of The Carlile Formationmentioning

confidence: 99%