Lithostratigraphy, microlithofacies, and conodont biostratigraphy and biofacies of the Wahoo Limestone (Carboniferous), eastern Sadlerochit Mountains, Northeast Brooks Range, Alaska

Krumhardt, Andrea P.; Harris, Anita G.; Watts, K. F.

doi:10.3133/pp1568

Cited by 19 publications

(17 citation statements)

References 35 publications

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“…However, other authors have included specimens with two rostral nodes in D. noduliferus (Mizuno ) or in a transitional morphotype (Krumhardt et al . ).…”

Section: Remarksmentioning

confidence: 97%

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Early evolution of Declinognathodus close to the Mid‐Carboniferous Boundary interval in the Barcaliente type section (Spain)

Sanz-López

Blanco-Ferrera

2013

Palaeontology

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Upper Serpukhovian to lower Bashkirian conodonts studied from the lower and middle part of the Barcaliente Formation type section (NW Spain) are not abundant, but the sedimentary record seems unusually well represented. The first occurrence of Declinognathodus bernesgae occurs more than 140 m below the first occurrence of D. inaequalis, the taxon of the D. noduliferus species group appearing in the bed of the Global Standard Stratotype-section and Point (GSSP) for the Mid-Carboniferous Boundary (Arrow Canyon, Nevada). P1 elements transitional between D. bernesgae and D. inaequalis are described and considered relevant to the global correlation of the Mid-Carboniferous Boundary.In addition, D. praenoduliferus, D. cf. noduliferus, D. lateralis, Idiognathoides asiaticus, I. corrugatus and Neognathodus sp. are described and illustrated from the Barcaliente Formation. A phylogeny is proposed for the early species of these genera on the basis of the morphological changes of the P1 element, where the rostral parapet and area, the surface roughness and the length and depth of the adcarinal troughs are diagnostic characters at the specific level, while caudal ornamentation is a secondary taxonomic character.

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“…However, other authors have included specimens with two rostral nodes in D. noduliferus (Mizuno ) or in a transitional morphotype (Krumhardt et al . ).…”

Section: Remarksmentioning

confidence: 97%

“…n. japonicus from younger Alaskan samples shows poorly defined dorsal transverse ridges, a marked medial groove, and discrete, rounded nodes on the caudal parapet and carina (Krumhardt et al . , pl. 3, figs 1–3).…”

Section: Remarksmentioning

confidence: 99%

Early evolution of Declinognathodus close to the Mid‐Carboniferous Boundary interval in the Barcaliente type section (Spain)

Sanz-López

Blanco-Ferrera

2013

Palaeontology

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“…Alba, contienen ejemplares de Lochriea commutata, G. bilineatus y Pseudognathodus homopunctatus indicativos de la Zona debilineatus, Liviense (Viseense medio). La presencia de elementos de G. praebilineatus, G. semiglaber y G. pseudosemiglaber en la muestra CPE-16 indica un intervalo bajo dentro de la Krumhardt et al (1996).…”

Section: Bioestratigrafíaunclassified

Conodontos carboníferos de la sección del río Cares (Unidad de Picos de Europa, Zona Cantábrica, NO de España)

Blanco-Ferrera

García-López

Sanz-López

2005

Geobios

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Se han extraído por primera vez conodontos en la sección del río Cares, encontrándose 15 especies y 1 subespecie de conodontos carboníferos pertenecientes a 7 géneros, algunos de ellos referidos por primera vez en la Unidad de Picos de Europa. Los conodontos corresponden a varias zonas entre el Turnesiense superior y el Serpujoviense superior-Bashkiriense inferior. Además, la especie Idiognathodus incurvus DUNN se cita por primera vez en la Cordillera Cantábrica y en Europa meridional, en capas del Bashkiriense superior o del Moscoviense inferior. Résumé Des conodontes du Carbonifère ont été isolés pour la première fois dans la coupe du río Cares. 15 espèces et 1 sous-espèce appartenant à 7 genres ont été déterminés, certains d'entre eux n'avaient encore jamais été mentionnés dans l'Unité de Picos de Europa. Ces conodontes correspondent à différentes zones situées entre le Tournaisien supérieur et le Serpoukhovien inférieur. C'est également la première fois que l'espèce Idiognathodus incurvus DUNN est citée dans la Cordillère Cantabrique et en Europe méridionale dans le niveaux du Bashkirien supérieur ou dans le Moscovien inférieur.

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“…The stratigraphy of the Lisburne Group has been well studied both in the subsurface on the north slope of Alaska and in the front ranges of the northeastern Brooks Range , Krumhardt, et al, 1996. An unconformity truncates the uppermost Lisburne Group, which is overlain by the Sadlerochit Group, a clastic unit of variable composition ranging from quartz sandstone to shales and siltstones (figure 9).…”

Section: Lisburne Group Stratigraphymentioning

confidence: 99%

The Influence of Fold and Fracture Development on Reservoir Behavior of the Lisburne Group of Northern Alaska

Wallace¹,

Hanks²,

Jensen³

et al. 2002

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The Carboniferous Lisburne Group is a major carbonate reservoir unit in northern Alaska. The Lisburne is detachment folded where it is exposed throughout the northeastern Brooks Range, but is relatively undeformed in areas of current production in the subsurface of the North Slope. The objectives of this study are to develop a better understanding of four major aspects of the Lisburne:1. The geometry and kinematics of detachment folds and their truncation by thrust faults. 2. The influence of folding on fracture patterns. 3. The influence of deformation on fluid flow. 4. Lithostratigraphy and its influence on folding, faulting, fracturing, and reservoir characteristics.The Lisburne in the main axis of the Brooks Range is characteristically deformed into imbricate thrust sheets with asymmetrical hangingwall anticlines and footwall synclines. In contrast, the Lisburne in the northeastern Brooks Range is characterized by symmetrical detachment folds. The focus of our 2000 field studies was at the boundary between these structural styles in the vicinity of Porcupine Lake, in the Arctic National Wildlife Refuge. The northern edge of thrust-truncated folds in Lisburne is marked by a local range front that likely represents an eastward continuation of the central Brooks Range front. This is bounded to the north by a gently dipping panel of Lisburne with local asymmetrical folds. The leading edge of the flat panel is thrust over Permian to Cretaceous rocks in a synclinal depression. These younger rocks overlie symmetrically detachment-folded Lisburne, as is extensively exposed to the north.Six partial sections were measured in the Lisburne of the flat panel and local range front. The Lisburne here is about 700 m thick and is interpreted to consist primarily of the Wachsmuth and Alapah Limestones, with only a thin veneer of Wahoo Limestone. The Wachsmuth (200 m) is gradational between the underlying Missippian Kayak Shale and the overlying Mississippian Alapah, and increases in resistance upward. The Alapah consists of a lower resistant member (100 m) of alternating limestone and chert, a middle recessive member (100 m), and an upper resistant member (260 m) that is similar to Wahoo in the northeastern Brooks Range. The Wahoo is recessive and is thin (30 m) due either to non-deposition or erosion beneath the sub-Permian unconformity. The Lisburne of the area records two major episodes of transgression and shallowing-upward on a carbonate ramp. Thicknesses and facies vary along depositional strike.Asymmetrical folds, mostly truncated by thrust faults, were studied in and south of the local range front. Fold geometry was documented by surveys of four thrust-truncated folds and two folds not visibly cut by thrusts. A portion of the local range front was mapped to document changes in fold geometry along strike in three dimensions. The folds typically display a long, non-folded gently to moderately dipping backlimbs and steep to overturned forelimbs, commonly including parasitic anticline-syncline pairs. Thrusts commo...

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Lithostratigraphy, microlithofacies, and conodont biostratigraphy and biofacies of the Wahoo Limestone (Carboniferous), eastern Sadlerochit Mountains, Northeast Brooks Range, Alaska

Cited by 19 publications

References 35 publications

Early evolution of Declinognathodus close to the Mid‐Carboniferous Boundary interval in the Barcaliente type section (Spain)

Early evolution of Declinognathodus close to the Mid‐Carboniferous Boundary interval in the Barcaliente type section (Spain)

Conodontos carboníferos de la sección del río Cares (Unidad de Picos de Europa, Zona Cantábrica, NO de España)

The Influence of Fold and Fracture Development on Reservoir Behavior of the Lisburne Group of Northern Alaska

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