348
3
Results
3.1
Regionalization
W. L. Watney· J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
Areas of similar thicknesses identified from the regionalized classification are
rhombic and arcuate shaped, lOs ofkm in size and referred to as sediment accumulation regions (SARs) (Fig.lb). Each region is an area where thicknesses are
more consistent among the six stratigraphic intervals included in the analysis.
Each region is separated by narrow bands of changes in thickness that are not
classified into any region.
3.2
Color Gamma-Ray Cross-Section
A regional color cross-section was used to examine internal stratigraphic changes within and across SARs. The color cross-sections depict changes in natural
gamma radiation. Ten color levels are used to partition the stratigraphic interval
such that basic lithologic changes can been seen. Lithology assignments are assisted with the use of additional well log data (neutron-density porosity) for
each well. Most yellow and pink intervals are limestone and blue and purple are
clastics. Condensed sections with high gamma ray are colored dark blue gray to
white. Correlation lines connect correlatable condensed sections in GSUs with a
few exceptions - the Toronto, Haskell, and Stanton Limestones.
Major limestones associated with GSUs are labeled in this section. The genetic sets GSs shown include the Nuyaka Creek overlain by the Muncie Creek, delimited by prominent radioactive condensed sections. GSUs comprising the GSs
are delimited for the most part by additional thin radioactive condensed sections. The GSUs used in the regionalized classification are named in the Nuyaka
Creek GS as Hushpuckney, Stark, Wea, and Quivira. These names refer to the
condensed sections that form the lower boundary of each GSu. The Munice
Creek GS is delimited by the Muncie Creek and Heebner condensed sections.
The northwest-to-southeast cross section (Fig. 6) is discussed in the context
of successive SAR boundaries which cross the section at positions starting from
the shelfward northwestern side.
The SAR boundary labeled A, farthest northwest, is associated with an abrupt
southeastward thickening of the shale (blue) in the Douglas Group and a limestone in the lower Munice Creek GS, the Farley Limestone GSu. The lola and
Dewey Limestones are thicker locally west of boundary A. SAR boundary B is associated with initial southward thinning and eventual downlapping of the Oread
Limestone immediately southeast of boundary B. The shale-dominated Douglas
Group between the Oread and Stanton Limestones thickens abruptly southeast
of boundary B. Gamma radiation intensity is elevated in the Douglas Group immediately before it thickens to the southeast at boundary B, suggesting a cor-
3
Results
3.1
Regionalization
W. L. Watney· J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
Areas of similar thicknesses identified from the regionalized classification are
rhombic and arcuate shaped, lOs ofkm in size and referred to as sediment accumulation regions (SARs) (Fig.lb). Each region is an area where thicknesses are
more consistent among the six stratigraphic intervals included in the analysis.
Each region is separated by narrow bands of changes in thickness that are not
classified into any region.
3.2
Color Gamma-Ray Cross-Section
A regional color cross-section was used to examine internal stratigraphic changes within and across SARs. The color cross-sections depict changes in natural
gamma radiation. Ten color levels are used to partition the stratigraphic interval
such that basic lithologic changes can been seen. Lithology assignments are assisted with the use of additional well log data (neutron-density porosity) for
each well. Most yellow and pink intervals are limestone and blue and purple are
clastics. Condensed sections with high gamma ray are colored dark blue gray to
white. Correlation lines connect correlatable condensed sections in GSUs with a
few exceptions - the Toronto, Haskell, and Stanton Limestones.
Major limestones associated with GSUs are labeled in this section. The genetic sets GSs shown include the Nuyaka Creek overlain by the Muncie Creek, delimited by prominent radioactive condensed sections. GSUs comprising the GSs
are delimited for the most part by additional thin radioactive condensed sections. The GSUs used in the regionalized classification are named in the Nuyaka
Creek GS as Hushpuckney, Stark, Wea, and Quivira. These names refer to the
condensed sections that form the lower boundary of each GSu. The Munice
Creek GS is delimited by the Muncie Creek and Heebner condensed sections.
The northwest-to-southeast cross section (Fig. 6) is discussed in the context
of successive SAR boundaries which cross the section at positions starting from
the shelfward northwestern side.
The SAR boundary labeled A, farthest northwest, is associated with an abrupt
southeastward thickening of the shale (blue) in the Douglas Group and a limestone in the lower Munice Creek GS, the Farley Limestone GSu. The lola and
Dewey Limestones are thicker locally west of boundary A. SAR boundary B is associated with initial southward thinning and eventual downlapping of the Oread
Limestone immediately southeast of boundary B. The shale-dominated Douglas
Group between the Oread and Stanton Limestones thickens abruptly southeast
of boundary B. Gamma radiation intensity is elevated in the Douglas Group immediately before it thickens to the southeast at boundary B, suggesting a cor-