Mixed-layer illite-smectite (I-S) from a new set of Pennsylvanian-aged Illinois Basin underclays,... more Mixed-layer illite-smectite (I-S) from a new set of Pennsylvanian-aged Illinois Basin underclays, identified as paleosols, are investigated to assess the impact of (1) regional diagenesis across the basin and (2) the extent to which ancient environments promoted illitization during episodes of soil formation. Interpretations from Reichweite Ordering and Δ° 2θ metrics applied to X-ray diffraction patterns suggest that most I-S in Illinois Basin paleosols are likely the product of burial diagenetic processes and not ancient soil formation processes. Acid leaching from abundant coal units and hydrothermal brines are likely diagenetic mechanisms that may have impacted I-S in Pennsylvanian paleosols. These findings also suggest that shallowly buried basins (<3 km) such as the Illinois Basin may still promote clay mineral alteration through illitization pathways if maximum burial occurred in the deep past and remained within the diagenetic window for extended periods of time. More impo...
Calcic Vertisols in the upper Daptocephalus Assemblage Zone, Balfour Formation, Karoo Basin, South Africa: Implications for Late Permian Climate
Journal of Sedimentary Research
The fully continental succession of the Beaufort Group, Karoo Basin, South Africa, has been used ... more The fully continental succession of the Beaufort Group, Karoo Basin, South Africa, has been used in the development of environmental models proposed for the interval that spans the contact between the Daptocephalus to Lystrosaurus Assemblage Zones, associated by some workers with the end-Permian extinction event. An aridification trend is widely accepted, yet geochemical data indicate that the majority of in situ paleosols encountered in this interval developed in waterlogged environments. To date, the presence of calcic paleosols in the latest Permian can be inferred only from the presence of calcite-cemented pedogenic nodules concentrated in fluvial channel-lag deposits. Here, we report on the first empirical evidence of in situ calcic Vertisols found in the upper Daptocephalus Assemblage Zone near Old Wapadsberg Pass, one of eight classic localities in which the vertebrate turnover is reported in the Karoo Basin. Seven discrete intervals of calcic Vertisols, exposed over a very l...
Taphonomy and paleoenvironments of Middle Triassic bone accumulations in the Lifua Member of the Manda Beds, Songea Group (Ruhuhu Basin), Tanzania
Journal of Vertebrate Paleontology
Updated geology and vertebrate paleontology of the Triassic Ntawere Formation of northeastern Zambia, with special emphasis on the archosauromorphs
Journal of Vertebrate Paleontology
Sclerosperma fossils from the late Oligocene of Chilga, north-western Ethiopia
Grana
An Abandoned-Channel Fill with Exquisitely Preserved Plants in Redbeds of the Clear Fork Formation, Texas, Usa: An Early Permian Water-Dependent Habitat on the Arid Plains of Pangea
Journal of Sedimentary Research, 2016
Resolving the age of Madumabisa fossil vertebrates: Palynological evidence from the mid-Zambezi Basin of Zambia
A 400 million year carbon isotope record of pedogenic carbonate: Implications for paleoatmospheric carbon dioxide
Amer J Sci, 1999
CO2 as a primary driver of Phanerozoic climate
Gsa Today, 2004
Incremental vacuum dehydration-decarbonation experiments on a natural gibbsite (alpha-Al(OH3)): CO2 abundance and delta13C values
Geochim Cosmochim Acta, 2005
Clear Fork Group (Leonardian, Lower Permian) of North-Central Texas
Incremental vacuum dehydration-decarbonation experiments on a natural gibbsite (-Al(OH3)): CO2 abundance and 13 C values
Geochim Cosmochim Acta, 2005
Reconstructing atmospheric pCO2 in the deep-time: Constraints and limitations
Geochmica Et Cosmochimica Acta, Jun 1, 2009
Permo-Pennsylvanian palaeotemperatures from Fe-Oxide and phyllosilicate delta18O values
Earth Planet Sci Lett, 2007
Oxygen and hydrogen isotope compositions of pedogenic phyllosilicates and iron oxyhydroxides: Development of modern surface domain arrays and implications for paleotemperature reconstructions
Seasonality and Modern Human Foraging Behaviors in the MSA of Northwest Ethiopia
The Permian Moradi Formation, Niger. Palaeosol morphology, petrography and mineralogy
Paleoclimate Reconstruction From the d13C Organic and d13C Carbonate Proxies in Triassic Paleosols and Sediments, Ischigualasto Basin Argentina
Another unique river: A consideration of some of the characteristics of the trunk tributaries of the Nile River in northwestern Ethiopia in relationship to their aquatic food resources
Journal of Human Evolution, 2014
Juxtaposed Permian and Pleistocene isotopic archives: Surficial environments recorded in calcite and goethite from the Wichita Mountains, Oklahoma
Special Paper 395: Isotopic and elemental tracers of Cenozoic climate change, 2005
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Papers by Neil Tabor