Ordovician metre-scale cycles: implications for climate and eustatic fluctuations in the central Appalachians during a global greenhouse, non-glacial to glacial transition

Pope, Mike; Read, J. Fred

doi:10.1016/s0031-0182(97)00130-2

Cited by 78 publications

(47 citation statements)

References 23 publications

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“…The parasequences are capped by prominent hardgrounds, which are heavily bored on, and may be phosphate or iron encrusted. With the exception of the glauconite beds, this facies is very similar to the High Bridge and St. Paul Group of Kentucky and Virginia (Pope and Read, 1998). This Early to Late Ordovician facies change across eastern Laurentia has been interpreted as reflecting major climatic change during the Ordovician (Pope and Read, 1998;Pope and Steffen, 2003).…”

Section: Sequence Stratigraphymentioning

confidence: 82%

“…The succession of the Kirtonryggen and Valhallfonna formations is in several aspects very similar to time-equivalent carbonate successions of the eastern paleomargin of Laurentia, and can be directly compared with the Early to early Middle Ordovician carbonates of the central Appalachian Basin (compare Pope and Read, 1998;Brezinski et al, 2012) and of western Newfoundland (compare Pratt andJames, 1986, Knight andJames, 1987;Knight et al, 2007). The Kirtonryggen Formation is mainly composed of fossiliferous bioturbated mud-wackestone, ribbon carbonate, intraclastic (predominately flat-pebble) conglomerate, grainstone and oolite, and microbial laminite.…”

Section: Sequence Stratigraphymentioning

confidence: 90%

“…The deeper depositional settings of this part of the Knox Group consists of subtidal ribbon carbonates and more massive microbial bioherms (Pope and Read, 1998). On western Newfoundland the Lower Ordovician part of the St. George Group consists of peritidal carbonates that range from supratidal cryptalgal laminates, intertidal ribbon carbonates, and stromatolites to deeper subtidal thrombolite mounds and fossiliferous wackestone (Pratt and James, 1986).…”

Section: Sequence Stratigraphymentioning

confidence: 99%

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The Ordovician Succession Adjacent to Hinlopenstretet, Ny Friesland, Spitsbergen

Kröger

Finnegan

Franeck

et al. 2017

American Museum Novitates

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The Ordovician sections along the western shore of the Hinlopen Strait, Ny Friesland, Spitsbergen were discovered in the late 1960s and since then prompted numerous paleontological publications; several of these publications are now considered classical in the literature of paleontology of Ordovician trilobites and of Ordovician paleogeography and stratigraphy. Our 2016 expedition aimed at a major recollection and reappraisal of these classical sites. Here we provide a first high-resolution lithological description of the Kirtonryggen and Valhallfonna formations (Tremadocian-Darriwilian), which together comprise a thickness of 843 m, a revised bio-, and lithostratigraphy, and an interpretation of the depositional sequences. We find that the sedimentary succession is very similar to successions of eastern Laurentia; its Tremadocian and early Floian part is composed of predominantly peritidal dolostones and limestones characterized by ribbon carbonates, intraclastic conglomerates, microbial laminites, and stromatolites, and its late Floian to Darriwilian part is composed of fossil-rich, bioturbated, cherty mud-wackestone, skeletal grainstone and shale, with local siltstone and glauconitic horizons. The succession can be subdivided into five third-order depositional sequences, which are interpreted as representing the Sauk IIIB Supersequence known from elsewhere on the Laurentian platform.

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Section: Sequence Stratigraphymentioning

confidence: 82%

Section: Sequence Stratigraphymentioning

confidence: 90%

Section: Sequence Stratigraphymentioning

confidence: 99%

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The Ordovician Succession Adjacent to Hinlopenstretet, Ny Friesland, Spitsbergen

Kröger

Finnegan

Franeck

et al. 2017

American Museum Novitates

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“…Renewed stagnation of the Łysogóry basin at the end of Sandbian and in the early Katian (middle/late Caradoc) resulted in the return of oxygen-deficient conditions in the lower zone of the water column (Trela 2009). In view of data connecting the glacier growth of Gondwana from the late Sandbian (Pope & Read 1998), it can be assumed that these changes, also described from the Polish part of the East European Craton (Modliński 1982), resulted from different oceanographic conditions. The shallowest part of the JCF and beginning of the Wólka Formation are characterized by the lack of framboids which suggest oxic conditions in the water column (Fig.5).…”

Section: Discussionmentioning

confidence: 99%

Ordovician Jeleniów Claystone Formation of the Holy Cross Mountains, Poland – Reconstruction of redox conditions using pyrite framboid study

Smolarek¹,

Marynowski²,

Trela³

2014

Contemporary Trends in Geoscience

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The aim of this research is to reconstruct palaeoredox conditions during sedimentation of the Jeleniów Claystone Formation deposits, using framboid pyrite diameter measurements. Analysis of pyrite framboids diameter distribution is an effective method in the palaeoenvironmental interpretation which allow for a more detailed insight into the redox conditions, and thus the distinction between euxinic, dysoxic and anoxic conditions. Most of the samples is characterized by framboid indicators typical for anoxic/euxinic conditions in the water column, with average (mean) values ranging from 5.29 to 6.02 µm and quite low standard deviation (SD) values ranging from 1.49 to 3.0. The remaining samples have shown slightly higher values of framboid diameter typical for upper dysoxic conditions, with average values (6.37 to 7.20 µm) and low standard deviation (SD) values (1.88 to 2.88). From the depth of 75.5 m till the shallowest part of the Jeleniów Claystone Formation, two samples have been examined and no framboids has been detected. Because secondary weathering should be excluded, the lack of framboids possibly indicates oxic conditions in the water column. Oxic conditions continue within the Wólka Formation based on the lack of framboids in the ZB 51.6 sample.

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“…These changes can be interpreted to reflect eustatic variability in greenhouse versus icehouse conditions (Read, 1995;Elrick, 1996;Pope and Read, 1998) or, alternatively, changes in sediment supply and export (Burgess, 2001). Deconvolving these trends can be challenging, but detailed analysis of the facies variability can be helpful.…”

Section: Eustatic Trendsmentioning

confidence: 99%

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Osburn¹,

Grotzinger²,

Bergmann³

2014

Bulletin

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The Khufai Formation is the oldest carbonate platform of the Cryogenian to lowermost Cambrian Huqf Supergroup. A stratigraphic characterization of this unit includes detailed facies descriptions, a sequence-stratigraphic interpretation, and evaluation of lateral heterogeneity and overall ramp evolution. The Khufai Formation comprises one and one-half depositional sequences with a maximum flooding interval near the base of the formation and a sequence boundary within the upper peritidal facies. Most of the deposition occurred during highstand progradation of a carbonate ramp. Facies tracts include outer-ramp and midramp mudstones and wackestones, ramp-crest grainstone shoal deposits, and extensive inner-ramp, microbially dominated peritidal deposits. Outcrops in the Oman Mountains are deepwater deposits, including turbiditic grainstone and wackestone interbedded with siliciclastic-rich siltstone and crinkly laminite. Facies patterns and parasequence composition are variable both laterally across the outcrop area and vertically through time because of a combination of ramp morphology, siliciclastic supply, and possible syndepositional faulting. The lithostratigraphic boundary between the Khufai Formation and the overlying Shuram Formation is gradational and represents significant flooding of the carbonate platform. The stratigraphic characterization presented here along with the identification of key facies and diagenetic features will help further future exploration and production of hydrocarbons from the Khufai Formation.

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Ordovician metre-scale cycles: implications for climate and eustatic fluctuations in the central Appalachians during a global greenhouse, non-glacial to glacial transition

Cited by 78 publications

References 23 publications

The Ordovician Succession Adjacent to Hinlopenstretet, Ny Friesland, Spitsbergen

The Ordovician Succession Adjacent to Hinlopenstretet, Ny Friesland, Spitsbergen

Ordovician Jeleniów Claystone Formation of the Holy Cross Mountains, Poland – Reconstruction of redox conditions using pyrite framboid study

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

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