Cenomanian-Turonian flooding cycles: U.S. Gulf Coast and Western Interior

Scott, Robert W.; Oboh‐Ikuenobe, Francisca E.; Benson, D G; Holbrook, John; Alnahwi, Ahmed

doi:10.1016/j.cretres.2018.03.027

Cited by 27 publications

(19 citation statements)

References 40 publications

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“…The Mesa Rica Sandstone (hereafter referred to as ‘Mesa Rica’) was deposited during the Cenomanian ( ca 98 to 99 Ma, Scott et al , ) and is the oldest formation within the Dakota Group in Colorado and New Mexico (Holbrook and Wright Dunbar, ; Scott et al , ). The Dakota Group is among the eastward prograding sedimentary systems of the US Western Interior that were sourced from the Sevier fold‐and‐thrust belt (MacKenzie and Poole, ; Pecha et al , ).…”

Section: Geological Setting and Stratigraphic Frameworkmentioning

confidence: 99%

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Internal mouth‐bar variability and preservation of subordinate coastal processes in low‐accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

Yperen

Poyatos‐Moré

Holbrook

et al. 2020

The Depositional Record

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Mouth bars are the fundamental architectural elements of proximal deltaic successions. Understanding their internal architecture and complex interaction with coastal processes (fluvial, tide and wave‐dominated) is paramount to the interpretation of ancient deltaic successions. This is particularly challenging in low‐accommodation systems, because they are commonly characterized by thin, condensed and top‐truncated sections. This study analyses the exhumed Cenomanian Mesa Rica Sandstone (Dakota Group, Western Interior Seaway, USA), a fluvio‐deltaic system covering a ca 450 km depositional dip‐parallel profile. The study targets the proximal deltaic expression of the system, using 22 sedimentary logs (total of 390 m) spatially correlated within a ca 25 km2 study area at the rim of the Tucumcari Basin. Analysis of facies distributions, depositional architecture and spatial extent of stratigraphic surfaces reveals a 6–10 m thick, sharp‐based and sand‐prone deltaic package, comprising several laterally extensive (>1.4 km width) mouth bars. Composite erosional surfaces infilled with multi‐storey fluvial and marine‐influenced channel deposits (12–20 m thick, 100–250 m wide) scour locally into the deltaic package. Based on differences in sedimentary structures, bed thicknesses, occurrence of interflood beds and bioturbation indexes, four different sub‐environments within single mouth bars were distinguished. These range from mouth‐bar axis, off‐axis, fringe to distal‐fringe deposits, which reflect waning depositional energy with increasing distance from the distributary channel mouth. The interpreted mouth‐bar components also show internal variability in dominant process regime, with overall river dominance but local preservation of tide influence in the fringe and distal fringe components. Mouth‐bar deposits amalgamate to form an extensive sand‐rich sheet body throughout the study area, in which interflood mudstone to very‐fine grained sandstone beds are nearly absent. These features reflect successive coalescence of mouth bars in a low accommodation/supply (A/S) setting. These conditions promoted recurrent channel avulsion/bifurcation and thus the potential reworking of previously deposited mouth‐bar fringe and distal‐fringe sediments, where time and background processes are better recorded. Results of this study evidence internal process‐regime variability within mouth‐bar components. They also caution against the possible loss of preservation of subordinate coastal processes (e.g. tidal indicators), and consequent underestimation of the true mixed influence in low‐accommodation deltaic settings.

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Section: Geological Setting and Stratigraphic Frameworkmentioning

confidence: 99%

“…References used for compilation; Waage, ; Holbrook et al , ; Oboh‐Ikuenobe et al , ; Van Yperen et al , 2019a, b). Albian‐Cenomanian boundary from Scott et al , (). (C) Photograph showing the stratigraphy in the study area (modified after Van Yperen et al , ).…”

Section: Geological Setting and Stratigraphic Frameworkmentioning

confidence: 99%

Internal mouth‐bar variability and preservation of subordinate coastal processes in low‐accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

Yperen

Poyatos‐Moré

Holbrook

et al. 2020

The Depositional Record

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“…The Dakota Group also received minor sediment volumes Line, et al (2019). Albian-Cenomanian boundary from Scott et al (2018). SB, Sequence boundary, TS, Transgressive Surface.…”

Section: And Previous Stratigraphic Frameworkmentioning

confidence: 99%

“…At times of Dakota Group deposition, the study area was located at ~35°N latitude, with a prevailing warm and humid climate (Chumakov et al, 1995). An overall NNW-to SSE-oriented depositional profile characterizes the Cenomanian Dakota Group (Scott, Oboh-Ikuenobe, Benson, Holbrook, & Alnahwi, 2018) in southeast Colorado and northeast New Mexico. The group is underlain by the Albian marine Glencairn Formation in Colorado and equivalent Tucumcari Shale in northeast New Mexico, and overlain by the Cenomanian Graneros Shale (e.g.…”

Section: And Previous Stratigraphic Frameworkmentioning

confidence: 99%

Low‐accommodation and backwater effects on sequence stratigraphic surfaces and depositional architecture of fluvio‐deltaic settings (Cretaceous Mesa Rica Sandstone, Dakota Group, USA)

et al. 2020

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“…The Mesa Rica Sandstone (hereafter referred to as 'Mesa Rica') was deposited ~98-99 Ma during the Cenomanian (Scott et al, 2018) and is the oldest formation within the Dakota Group in Colorado and New Mexico (e.g. Holbrook and Wright Dunbar, 1992;Scott et al, 2004).…”

Section: Geological Setting and Stratigraphic Frameworkmentioning

confidence: 99%

Internal mouth bar variability and preservation of interflood beds in low-accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

Yperen¹,

Poyatos‐Moré²,

Holbrook³

et al. 2019

Preprint

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Mouth bars are the fundamental architectural elements of proximal deltaic successions. Understanding their internal architecture and deciphering the relative impact and complex interaction of coastal processes (fluvial-, tide- and wave-dominated) is paramount to the interpretation of ancient deltaic successions. This is particularly challenging in low-accommodation systems, because they are commonly characterized by thin, condensed and top-truncated sections. In this study, we analyze the exhumed Cenomanian Mesa Rica Sandstone (Dakota Group, Western Interior Seaway, USA), which encompasses a fluvio-deltaic system covering a ~450 km profile oriented parallel to depositional-dip direction. The study targets the proximal deltaic expression of the system, with 22 sedimentary logs (total of 390 m) spatially correlated within a ~25 km2 study area at the rim of the Tucumcari Basin. Analysis of facies distributions, depositional architecture and spatial extent of stratigraphic surfaces reveals a 6–10-m-thick, sharp-based and sand-prone deltaic package, comprising several laterally-extensive (>800 m width) mouth bars. Composite erosional surfaces infilled with multi-story fluvial and marine-influenced channel deposits (12–20 m thick, 100–250 m wide) scour locally into the deltaic package. Based on differences in sedimentary structures, bed thicknesses, occurrence of interflood beds and bioturbation indexes, we distinguish four different subenvironments within single mouth bars. These range from mouth bar axis, off-axis, fringe to distal fringe deposits, and each reflect differences in hydraulic conditions as moving away from the main active feeding channel. The interpreted mouth bar components also show intra-mouth-bar variability in dominant process regime, with overall river dominance but local preservation of tide influence in the fringe and distal fringe components. Mouth bar deposits amalgamate to form an extensive sand-rich sheet body throughout the study area, in which interflood mudstone to very-fine grained sandstone beds are nearly absent. These features are interpreted to reflect successive coalescence of mouth bars in a low accommodation / supply (A/S) setting. These conditions promoted channel avulsion/bifurcation and thus the potential reworking of previously deposited mouth bar fringe and distal fringe sediments, where tide influence tends to be better recorded. Results of this study evidence a common mixed nature and internal process-regime variability within mouth bar components. They also caution against the possible loss of preservation of subordinate processes (e.g. tidal indicators), and consequent underestimation of the true mixed influence in low-accommodation deltaic settings.

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Cenomanian-Turonian flooding cycles: U.S. Gulf Coast and Western Interior

Cited by 27 publications

References 40 publications

Internal mouth‐bar variability and preservation of subordinate coastal processes in low‐accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

Internal mouth‐bar variability and preservation of subordinate coastal processes in low‐accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

Low‐accommodation and backwater effects on sequence stratigraphic surfaces and depositional architecture of fluvio‐deltaic settings (Cretaceous Mesa Rica Sandstone, Dakota Group, USA)

Internal mouth bar variability and preservation of interflood beds in low-accommodation proximal deltaic settings (Cretaceous Dakota Group, New Mexico, USA)

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