Eustatic cyclicity in the paleocene and eocene: data from the Brazos River Valley, Texas

Davidoff, Andrew J.; Yanccy, Thomas E

doi:10.1016/0040-1951(93)90360-v

Cited by 20 publications

(15 citation statements)

References 24 publications

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“…2), suggesting that it was formed in a rapid depositional event (19). This material was probably initially deposited as the settling tail-end of the impact-induced tsunami/ seiche (21,22) and subsequently resuspended during postimpact storms (23,29).…”

Section: Resultsmentioning

confidence: 99%

“…1). In the Late Cretaceous and early Paleogene, the Brazos area was characterized by nearly continuous and predominantly siliciclastic sedimentation on the shallow shelf of the northern Gulf of Mexico, close to the entrance of the Western Interior Seaway (19,20), at estimated depths of 75-200 m (21,22). The sedimentary successions in this region comprise the Maastrichtian Corsicana (Kemp Clay) Formation and the Paleocene basal and upper Littig members of the Kincaid Formation.…”

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confidence: 99%

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Rapid short-term cooling following the Chicxulub impact at the Cretaceous–Paleogene boundary

Vellekoop

Sluijs

Smit³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

167

157

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Significance Here, for the first time (to our knowledge), we are able to demonstrate unambiguously that the impact at the Cretaceous–Paleogene boundary (K–Pg, ∼66 Mya) was followed by a so-called “impact winter.” This impact winter was the result of the injection of large amounts of dust and aerosols into the stratosphere and significantly reduced incoming solar radiation for decades. Therefore, this phase will have been a key contributory element in the extinctions of many biological clades, including the dinosaurs. The K–Pg boundary impact presents a unique event in Earth history because it caused global change at an unparalleled rate. This detailed portrayal of the environmental consequences of the K–Pg impact and aftermath aids in our understanding of truly rapid climate change.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Rapid short-term cooling following the Chicxulub impact at the Cretaceous–Paleogene boundary

Vellekoop

Sluijs

Smit³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

167

157

View full text Add to dashboard Cite

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“…An increase in rainfall, a change in basin dynamics affecting drainage, or a change in sea level also affecting drainage are all possible causes for this signifi cant change in pedogenesis. Lehman (1991), Davidoff and Yancey (1993), and Atchley et al (2004) all report that during the Late Cretaceous and early Paleocene, the coastline was at least 150 km away; it continued to fall during the rest of the Paleogene, with some short-lived transgressive events, but Late Cretaceous sea-levels were never reached (Dockery, 1986). If the coastline was at least 150 km away, it seems unlikely that it would have any infl uence on drainage through the Tornillo Basin that would affect pedogenesis.…”

Section: Stratigraphic Changes In Paleosolsmentioning

confidence: 92%

Paleogene paleosols and changes in pedogenesis during the initial Eocene thermal maximum: Big Bend National Park, Texas, USA

White

Schiebout

2008

Geological Society of America Bulletin

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This paper tests the hypothesis that continental chemical weathering increased during the initial Eocene thermal maximum (IETM) by comparing paleosols that formed before and during the event in western Texas. The chemical index of alteration (CIA) was used to investigate the weathering of silicate minerals. Paleosols generated before the IETM have CIA values ranging from 62 to 72, and CIA values during the IETM range from 67 to 82. The CIA values for pre-initial Eocene thermal maximum paleosols indicate moderate weathering conditions, and CIA values during the event indicate moderate to extreme weathering conditions. The clay mineralogy of the paleosols is dominated by smectite, and it is only within paleosols that formed during the IETM that there is a change. There is a notable increase in the amount of kaolinite in one paleosol horizon that is associated with the carbon excursion. In addition, there is an increase in the translocation of clays and iron, and an increase in the leaching of calcite and plagioclase in initial Eocene thermal maximum paleosols. The differences between soils that formed before and during the initial Eocene thermal maximum indicate that chemical weathering did increase during this ancient global warming event. The mechanism responsible for increased weathering is interpreted to be an increase in hydrolysis reactions caused by an increase in humidity and an increase of carbonic acid in the soil due to elevated CO 2 levels during the initial Eocene thermal maximum. Documentation of an increase in chemical weathering during the initial Eocene thermal maximum is signifi cant because it may have served as a negative feedback to reduce atmospheric CO 2 .

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“…The Midway Group comprises predominantly marine deposits. The upper units become progressively more terrigenous in character in the western Gulf of Mexico region, where they are overlapped by the deltaic sands of the Wilcox Group of late Paleocene (Thanetian) and early Eocene (Ypresian) age (Davidoff and Yancey, 1993). In the eastern Gulf of Mexico region, the Wilcox Group is more commonly represented by marginal-marine deposits.…”

Section: Introductionmentioning

confidence: 99%

“…In Texas, the argillaceous lower Kincaid Formation, ranging from Zone NP1 to NP2 (Danian), is the source of a single echinoid specimen, but its calcareous facies, the Tehuacana Limestone, which is correlated with Zone NP3 (Davidoff and Yancey, 1993), contains rare entire tests and uncommon disarticulated echinoid plates and spines. The glauconitic sand of the Wills Point Formation (Danian) is the source of a few very fragile echinoids in central Texas.…”

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confidence: 99%

Paleocene echinoid faunas of the eastern United States

Zachos

2017

J. Paleontol.

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Twenty-one species of echinoid are reported from Paleocene rocks of the eastern United States along the outcrop belt from Texas to New Jersey. Six of these are strictly early Paleocene age (Danian), nine strictly late Paleocene age (Thanetian), five range throughout the Paleocene, and one previously reported Paleocene species (Diplodetus moscovensis) is most likely a Cretaceous species. Two new species are described, Salenia palmyra n. sp., from the Danian Clayton Formation in Alabama and Georgia, and Ova rancoca n. sp., from the Thanetian Vincentown Formation in New Jersey. One new species from the Clayton Formation in Mississippi, Arbaciella? sp., is left in open nomenclature.

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Eustatic cyclicity in the paleocene and eocene: data from the Brazos River Valley, Texas

Cited by 20 publications

References 24 publications

Rapid short-term cooling following the Chicxulub impact at the Cretaceous–Paleogene boundary

Rapid short-term cooling following the Chicxulub impact at the Cretaceous–Paleogene boundary

Paleogene paleosols and changes in pedogenesis during the initial Eocene thermal maximum: Big Bend National Park, Texas, USA

Paleocene echinoid faunas of the eastern United States

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