Geologic map of the Murray Quadrangle, Newton County, Arkansas

Hudson, Mark R.; Turner, Kenzie J.

doi:10.3133/sim3360

Cited by 3 publications

(9 citation statements)

References 8 publications

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“…The low strength and fissile nature of the shale facilitates landsliding that transports large boulders wasted from the outcropping sandstone down the hillslope and over large distances (hundreds of meters) into the channel. Landslide deposits that originate at the Bloyd Formation are common throughout the basin, and many of the larger deposits have been mapped [ Hudson and Turner , , , ]. The larger Bloyd clasts are abundant as lag deposits within the tributary channels that drain from the caprock (Figure a), and in some cases clasts are sufficiently large to dwarf the channel.…”

Section: Discussionmentioning

confidence: 99%

“…LSDTopotoolbox generates channels that are divided into evenly spaced nodes, each node containing values for elevation, position, drainage area, and channel steepness. Each node was associated with a lithology by spatially joining nodes with geologic polygons available from United States Geological Survey geological maps [ Hudson and Turner , , , ].…”

Section: Methodsmentioning

confidence: 99%

“…The Bloyd Formation caprock becomes sparse to absent in the lower reaches of the basin, and the Boone Formation dominates the plateau surfaces, so tributaries in the lower Buffalo River Basin do not incise through the Bloyd sandstone. Where the Bloyd sandstone caprock forms thick bluffs, large boulders of the unit are found on the hillslopes and in the channels below the cliffs [ Hudson and Turner , , ]. Because a large number of channels of various drainage areas incise through the same stratigraphic units, the basin provides an ideal location to study the changes in channel steepness as channels transition through lithologies with variable mechanical strengths.…”

Section: Study Areamentioning

confidence: 99%

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The influence of sandstone caprock material on bedrock channel steepness within a tectonically passive setting: Buffalo National River Basin, Arkansas, USA

Thaler

Covington

2016

JGR Earth Surface

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Bedrock channel profile analysis typically assumes that channels evolve toward a condition of topographic steady state where channel morphology is adjusted to rock erodibility, uplift rates, and stream power. Here we use the integral method of channel profile analysis to quantify channel steepness within a large set of tributary channels that incise through layered rocks in the Buffalo National River Basin in northern Arkansas. Statistical analysis of these channels demonstrates that normalized channel steepness is not a function of local bedrock lithology but is influenced by coarse sediment supply. Specifically, normalized steepness is greatest in reaches of the basin where an interval of Pennsylvanian sandstone forms a caprock on the ridges. Block detachment of the sandstone causes large boulders to be stranded in the upper tributaries where stream power is too low to mobilize or effectively erode the boulders. Within these channels, normalized steepness is correlated with sandstone boulder size and percent boulder coverage rather than local lithology, despite strong contrasts in the mechanical strength of the lithologies incised. This analysis suggests that removal of caprock material is rate limiting within the landscape and may be responsible for the long‐term persistence of topography within this tectonically passive setting.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

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The influence of sandstone caprock material on bedrock channel steepness within a tectonically passive setting: Buffalo National River Basin, Arkansas, USA

Thaler

Covington

2016

JGR Earth Surface

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“…The Ozark Plateaus region includes Salem and Springfield Plateaus and Boston Mountains physiographic provinces. (Turner and Hudon, 2018) SIM 3360 (Hudson and Turner, 2016) MF 2412 (Hudson and Murray, 2003) MF 2356 (Hudson and others, 2001) OFR 98-116 (Hudson, 1998) SIM 2847 (Hudson and Murray, 2004) SIM 2921 (Hudson and others, 2006) SIM 3314 (Hudson and Turner, 2014a) SIM 3074 (Hudson and Turner, 2009) SIM 3134 (Turner and Hudson, 2010) Figure 5. Structural data for the Osage SW quadrangle.…”

Section: A a B Bmentioning

confidence: 99%

“…Regression of the sea in Late Mississippian resulted in a major unconformity eroded into Upper Mississippian strata (Sutherland, 1988;Manger and Sutherland, 1992). This period of erosion is supported by the pinchout of the Pitkin Limestone, thinning of the Fayetteville Shale, and the presence of Archimedes-bearing Pitkin Limestone clasts in basal conglomerate lenses of the Cane Hill Member of the Lower Pennsylvanian Hale Formation ( hc), which were deposited above the unconformity (for example, Purdue and Miser, 1916;Hudson and Turner, 2016).…”

Section: Stratigraphymentioning

confidence: 99%

Geologic map of the Osage SW 7.5ʹ quadrangle, Newton, Madison, and Carroll Counties, Arkansas

Turner¹,

Hudson²

2018

Scientific Investigations Map

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Late Paleozoic Flexural Extension and Overprinting Shortening in the Southern Ozark Dome, Arkansas, USA: Evolving Fault Kinematics in the Foreland of the Ouachita Orogen

Hudson

Turner

2022

Tectonics

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Faults and folds on the southern flank of the Ozark dome in northern Arkansas, USA, record flexural extension in a foreland area followed by shortening in response to the late Paleozoic Ouachita orogeny. Map‐scale structures and an analysis of fault‐slip data collected systematically during geologic mapping demonstrate that most deformation in the area accommodated north‐south extension as the southern margin of Laurentia was flexed beneath the thrust load of the Ouachita belt, probably during Middle Pennsylvanian. Extension was concentrated in northeast‐ and west‐northwest‐trending structural zones having sets of discontinuous, often en echelon normal and strike‐slip faults and associated monoclinal folds. Reactivation of basement weaknesses that underlie these zones is indicated by their close match to oblique‐rift models in which both the proportions of normal and strike‐slip faulting and the internal extension directions vary with orientation of the zones. Subsequent propagation of north‐south Ouachita shortening into the foreland formed small‐offset strike‐slip and sparse reverse faults that overprinted older extensional structures. Strike‐slip faults were concentrated in reactivated northeast‐trending structural zones. In two areas, reverse faults and local anticlines were developed in the footwalls of older normal faults, both near intersections of northeast‐ and west‐northwest‐trending structural zones. These are interpreted as areas of incipient inversion due to compressional stress concentrations at fault‐block corners. Spatial overlap of areas of north‐south shortening and fluid flux marked by silicification or lead‐zinc mineralization indicates that regional fluid flow of brines was coeval with and may have enhanced inversion during Late Pennsylvanian to early Permian.

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Geologic map of the Murray Quadrangle, Newton County, Arkansas

Cited by 3 publications

References 8 publications

The influence of sandstone caprock material on bedrock channel steepness within a tectonically passive setting: Buffalo National River Basin, Arkansas, USA

The influence of sandstone caprock material on bedrock channel steepness within a tectonically passive setting: Buffalo National River Basin, Arkansas, USA

Geologic map of the Osage SW 7.5ʹ quadrangle, Newton, Madison, and Carroll Counties, Arkansas

Late Paleozoic Flexural Extension and Overprinting Shortening in the Southern Ozark Dome, Arkansas, USA: Evolving Fault Kinematics in the Foreland of the Ouachita Orogen

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