Geology of the Colorado Plateau: Grand Junction to Denver, Colorado June 30–July 7, 1989

Peterson, Fred; Turner-Peterson, Christine E.

doi:10.1029/ft130

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…The Lower Jurassic (Pliensbachian-Toarcian) Navajo Sandstone, along with its correlatives, the Nugget Sandstone of southwestern Wyoming and Colorado and the Aztec Sandstone of southern Nevada, formed the largest erg (sand sea) in geologic history (Blakey et al 1988;Peterson and Turner-Peterson 1989;Kocurek 2003). That the Navajo Sandstone was a subtropical desert is widely accepted (e.g., McKee 1979;Marzolf 1983;Parrish 1993).…”

Section: Introductionmentioning

confidence: 99%

Petrography and Environmental Interpretation of Tufa Mounds and Carbonate Beds In the Jurassic Navajo Sandstone of Southeastern Utah, U.S.A.

Dorney

Parrish

Chan

et al. 2017

Journal of Sedimentary Research

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Carbonate deposits in the Jurassic Navajo Sandstone of Utah reflect deposition in interdune lakes and springs. Interdune-lake deposits consist of flat-lying carbonate units. Springs formed tufa mounds that are interpreted as subaerial, ambient-temperature, artesian-spring deposits. In the first systematic study of the petrography of the carbonate deposits in the Navajo Sandstone, eleven facies were identified in several flat-lying carbonate deposits and two tufa mounds. Fenestral mudstone and peloidal facies dominate the lacustrine deposits, whereas thrombolitic mudstone characterizes the mounds. The biota consists of ostracodes, charophytes, fish, mollusks, a possible freshwater sponge, trace fossils, and fragments of vascular plants. Features resulting from penecontemporaneous weathering provide evidence of episodic exposure of the lacustrine carbonate beds during deposition and formation of the tufa mounds under subaerial conditions. Although carbonate deposits are not rare in eolian systems, few have been studied in detail; comparisons between these and the Navajo Sandstone carbonate deposits reveal some characteristics that may be unique to the latter.

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Section: Introductionmentioning

confidence: 99%

Petrography and Environmental Interpretation of Tufa Mounds and Carbonate Beds In the Jurassic Navajo Sandstone of Southeastern Utah, U.S.A.

Dorney

Parrish

Chan

et al. 2017

Journal of Sedimentary Research

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“…Thus, for communities that are mostly residential, not only can less of the tax burden be shifted onto nonresidential property (because the nonresidential base is relatively narrow) but the amount of residential market value subject to taxation is driven by what is happening in other parts of the state, typically the urban cores. Gallagher, then, put many rural communities in the difficult position of increasingly cutting public service quantity and quality over time as inflation-adjusted property tax revenue failed to keep pace with population growth (Eason 2018; Staver 2018; Swanson 2020). While this suggests that voters may approach Gallagher as a referendum on increased public spending, particularly in rural areas, Gallagher only controls who remits what share of the marginal public dollar.…”

Section: Background On the Gallagher Amendmentmentioning

confidence: 99%

Partisanship and Property Tax Redistribution: Evidence From Repealing Colorado's Gallagher Amendment

Propheter

2023

Public Finance Review

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In November 2020, Colorado voters were asked to repeal the state's Gallagher Amendment, a constitutional redistributive policy in effect since 1983 that shifted the local property tax burden away from residential property on to nonresidential property. This study explores how partisanship predicts support for repealing Gallagher. Republican and Democrat platforms both entail sociotropic messages to support repeal, but following through on these political ideals carries a salient and nontrivial pocketbook cost to residential property owners. If voters aligned with one party or another are more likely to support repeal, it follows that these voters are more willing to put their money where their mouth is, so to speak. Using election precinct voting data, I find that Democrat-leaning voters were more likely to support repeal than otherwise similar Republican-leaning voters.

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“…The Lower Jurassic Navajo Ss (Hettangian-Toarcian; Parrish et al, 2019) and its partial stratigraphic equivalents extend from Wyoming to Nevada, collectively recording the largest aeolian system in geologic history (; Blakey, 1988;Kocurek, 2003;Peterson & Turner-Peterson, 1989). The Navajo Ss is thickest in the western part of the arid continental basin, which is considered the erg center (southwestern Utah), and the unit thins eastward and is truncated against the Uncompahgre uplift (Ancestral Rocky Mountains; Blakey, 1988Blakey, , 1994Blakey, , 2008Blakey et al, 1988;Peterson, 1994;Peterson & Pipiringos, 1979).…”

Section: Geologic Settingmentioning

confidence: 99%

An erg landscape mystery: An exotic boulder in Jurassic aeolian‐fluvial deposits, Grand Staircase Escalante National Monument, Utah, USA

2023

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An unusually large exotic boulder occurs in strata close to the interfingering transition of the fluvial deposits of the Lower Jurassic Kayenta Formation and aeolian deposits of the Lamb Point Tongue of the Jurassic Navajo Sandstone in Grand Staircase Escalante National Monument, Utah. This boulder is composed of a weakly bedded, pink, thrombolitic burrowed mudstone and siltstone in a carbonate mudstone matrix. Comparison with similar carbonate units of the region—interpreted as lacustrine in origin and associated with interfingering deposits of Kayenta‐Navajo strata—indicates that the strata from which the boulder originated was likely a product of wind‐blown silt deposited in carbonate mud of a shallow lake. The exotic boulder is clearly embedded in and is eroding out of mostly massive to weakly bedded Jurassic, fine‐ to medium‐grained host sandstone. Nearby, the sandstone is disrupted by soft‐sediment deformation. The upper half of the enclosing sandstone shows low‐angle cross‐stratification that abuts against the edge of the boulder, indicating that Jurassic sedimentation lapped up against the sides of the boulder. Surprisingly, the exotic boulder does not co‐occur with any other clasts of similar lithology, nor is any obvious source lithology present within the immediate area. Lake beds of similar lithology in the same region are not physically traceable to the site where the exotic boulder occurs. The exotic boulder is evidence of the dynamic processes of the Jurassic landscape. The collective characteristics of the massive sandstone with typical polygonal weathering patterns and clusters of clastic pipes in the lower host rock suggest that the exotic boulder was emplaced in one of three ways: (A) fluid overpressurization, likely triggered by strong ground motion, produced the massive and deformed sandstone host and transported the boulder upward in the subsurface; (B) the block was an erosional remnant produced by Jurassic landscape degradation; or (C) the block was transported by a hyperconcentrated overland flow.

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Geology of the Colorado Plateau: Grand Junction to Denver, Colorado June 30–July 7, 1989

Cited by 6 publications

References 29 publications

Petrography and Environmental Interpretation of Tufa Mounds and Carbonate Beds In the Jurassic Navajo Sandstone of Southeastern Utah, U.S.A.

Petrography and Environmental Interpretation of Tufa Mounds and Carbonate Beds In the Jurassic Navajo Sandstone of Southeastern Utah, U.S.A.

Partisanship and Property Tax Redistribution: Evidence From Repealing Colorado's Gallagher Amendment

An erg landscape mystery: An exotic boulder in Jurassic aeolian‐fluvial deposits, Grand Staircase Escalante National Monument, Utah, USA

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