Lead-Zinc Crevices of Iowa, Illinois, and Wisconsin

Dockal, James A.

doi:10.1007/978-3-030-54633-5_7

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…At the surface, the dolomite often weathers into a distinctive honeycomb appearance. Honeycomb weathering is thought to result from preferred dissolution and weathering of Thalassinoides burrows (Dockal, 2021;Stewart and others, 2022b). Though the entire section is not exposed in the map area, the full thickness of the Galena Formation elsewhere ranges from approximately 70-76 m (230-250 ft).…”

Section: Galena Formationmentioning

confidence: 99%

Geologic map of the Stitzer and western part of the Montfort 7.5-minute quadrangles, Grant County, Wisconsin

Stewart,

Mauel,

Batten

2023

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Well-sorted Holocene and Pleistocene sand, silt, and mud. Deposited as overbank deposits in modern valleys. Cobble beds are uncommon, but can be found in river valleys where adjacent hillslopes are draped by colluvial deposits. ColluviumQc Angular, poorly sorted boulders, cobbles, sand, and silt. Deposited at the base and lower reaches of valley slopes from gravity-driven mass wasting, soil creep, and non-channelized overland flow. The unit tends to fine towards the valley bottoms, and can interfinger with alluvium. Thicknesses are generally in excess of 3 m (10 ft), but rapid changes are likely due to an uneven, underlying bedrock surface.Ql -Undivided loess. Windblown deposits of very ne sand, silt, and clay. May include parts of the Roxana and Peoria Members of the Kieler Formation, a loess formation. Loess is present on upland surfaces, and is generally thicker on broad plateaus than narrow ridges. Qlc -Undivided loess over carbonate rocks. The Rountree Formation, formed from the surface weathering of carbonate rocks, is probably discontinuously present beneath the loess. Qlb -Undivided loess over siliciclastic bedrock. Qlcb -Undivided loess over mixed carbonate and siliciclastic bedrock.

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Section: Galena Formationmentioning

confidence: 99%

Geologic map of the Stitzer and western part of the Montfort 7.5-minute quadrangles, Grant County, Wisconsin

Stewart,

Mauel,

Batten

2023

Open-File Report

View full text Add to dashboard Cite

show abstract

“…Unweathered samples of rocks from the Galena Formation that include Thalassinoides burrows show different textures within the burrows as compared to the surrounding matrix. Dockal (2021) reported that Thalassinoides burrows in the Galena Formation contain a coarser grain size, higher porosity, and greater permeability than the surrounding matrix. These textural and hydrogeologic differences probably lead to the differential weathering and honeycomb appearance of the Galena Formation at the surface.…”

Section: Figure 2 Box and Whisker Plot Of Combined Vug And Fracture D...mentioning

confidence: 99%