Stephan Oborny

Stephan Oborny
University of Kansas | KU · Kansas Geological Survey

Doctor of Philosophy

About

27
Publications
1,429
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43
Citations
Citations since 2017
26 Research Items
43 Citations
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Introduction
I am currently working at the Kansas Geological Survey. One of my duties for the KGS is to support the STATEMAP geological mapping program and involves surface-to-bedrock mapping in Cowley County, Kansas, and basin modeling of the basins and arches region of eastern Kansas, northeastern Oklahoma, and westernmost Missouri. Other duties include sequence stratigraphic and petrophysical analyses of strategic fine and coarse aggregate resources in Iowa and Kansas.

Publications

Publications (27)
Article
Full-text available
This paper provides a summary review of proposed nomenclatural revisions to the Zarah Subgroup of the Kansas City Group (Pennsylvanian) in Kansas and outlines changes adopted by the Kansas Geological Survey. The Iola Limestone, which comprises in ascending order the Paola Limestone, Muncie Creek Shale, and Raytown Limestone Members, is now consider...
Article
Full-text available
The Upper Silurian Salina Group of eastern North America is well known for its thick evaporite successions and hydrocarbon resources. These strata have been assigned to numerous chronostratigraphic schemes within Ohio and Michigan and are currently identified by varying subsurface and outcrop nomenclatural schemes. These chronostratigraphic challen...
Article
Diagenetic low-magnesium calcite (LMC) microcrystals constitute the framework that hosts most micropores in limestone reservoirs and therefore create the storage capacity for hydrocarbons, water, and anthropogenic CO2. Limestones dominated by LMC microcrystals are also commonly used for paleoclimate reconstructions and chemostratigraphic correlatio...
Article
High-resolution paired analyses of δ¹³Ccarb and δ¹³Corg from a new drill core from Gotland, Sweden, demonstrate asynchronous positive change in the carbon isotope records during the onset of one of the major Silurian biogeochemical events known as the Mulde Event or “Big Crisis”. The detailed carbon isotope record presented here provides Δ¹³C (the...
Article
Full-text available
Paired records of δ¹³Ccarb and δ¹³Corg across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ¹³Corg during the initiation of the Ireviken Ex...
Article
Silurian strata within the tristate area of Indiana, Ohio, and Kentucky have been thoroughly studied for well over a century. Due to rapid facies changes throughout the region numerous lithostratigraphic terminologies were established, many of which were difficult to correlate even over short distances. Recently these stratigraphic complexities hav...
Article
The eastern and southeastern margins of the Appalachian Basin contain extensive exposures of Telychian through Pridoli (upper Silurian) strata. Litho- and biostratigraphic analyses of these strata over the last century provided a general means for their chronostratigraphic correlation to global series and stage boundaries. However, a rarity of zona...
Conference Paper
Full-text available
A mass extinction event and perturbation to the global carbon cycle, known as the Mulde Event, took place during the late Wenlock Epoch of the Silurian Period. The Mulde positive carbon isotope excursion is recorded in the rock record by two positive excursions. Previous low-resolution studies indicated that the onset and end of the Mulde Excursion...
Article
The build-and-fill model for mixed carbonate-clastic systems was originally developed to explain thin, widespread, icehouse depositional sequences that maintain more-or-less equal thickness over wide areas despite complex internal architecture that includes both topography-building and topography-filling depositional phases. Lithologic heterogeneit...
Conference Paper
Full-text available
Cyclothem deposition in Miami and surrounding counties of the upper Linn and Zarah subgroups was dominated by carbonate mound development produced mainly during the falling stage of each cyclothem. These mounds were composed of photosynthetic phylloid algae which acted to produce and trap carbonate mud resulting in mound aggradation during the init...

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