350
W. L. Watney . J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
relation with change. The Farley Limestone also thickens abruptly southeastward at boundary A. Dennis Limestone is thick and the accompanying density-neutron logs indicate thick, high porosity immediately to the east of boundaryB.
SAR boundary C borders the northwestern side of the location where the
Oread Limestone thins and apparently begins to downlap unto its underlying radioactive condensed section. Farther southeast the Oread Limestone is entirely
pinched out to where the overlying radioactive condensed section (Queen Hill)
rests on a condensed section which normally lies below the Oread Limestone.
The Oread Limestone is thick and porous immediately northwest of the C
boundary. The location of this downlap is also near the position where the
Douglas Limestone in the Douglas Group first appears. The Hertha Limestone
locally thickens and is lower in gamma ray radiation at boundary C.
SAR boundary D is the sight of probably the most dramatic changes in thickness. The limestone unit overlying the Oread Limestone (Deer Creek Limestone)
thins and apparently downlaps at this position. The Douglas Limestone first appears at this position and continues to thicken southeastward. The lower portion
of the Muncie Creek genetic set comprised of carbonate units thickens nearly
40% across this boundary. The Stanton Limestone at the top of the lower portion
of the Muncie Creek genetic set thickens 150% while the lola Limestone situated
at the base of this set thins southward across the D boundary. Below the Muncie
Creek genetic set, the Nuyaka Creek genetic set remains fairly constant in thickness. However, the Cherryvale Formation, residing in this lower set, thickens
20% on the southeast side of boundary D.
SAR boundary E is associated with another abrupt thickening in the Muncie
Creek GS, but this time all the limestones that had thickened dramatically at
boundary D have now downlapped unto the Muncie Creek condensed section
immediately northwest of boundary E. The Upper Muncie Creek genetic set that
is clastic dominated thickens nearly 200% southeastward replacing the section
that is equivalent to the carbonates in the lower Muncie Creek GS, which have
appears to have downlapped. A thick sandstone called the Stalnaker develops at
and southeast of boundary E at a stratigraphic position adjacent to the midportion of the carbonate bank before it downlapped. The Douglas Limestone in the
Upper Muncie Creek GS is also characterized by major southeastward thickening and lowering of the gamma radiation indicative of cleaner (less shaly) carbonate. Other internal changes in the Douglas interval include increased gamma
radiation shelfward (northwest) of boundary E, closely resembling the change
seen near boundary B. Modest thickening occurs in the Nuyaka Creek GS across
boundary E. The Dennis Limestone in the Nuyaka Creek GS thickens and becomes much lower in gamma radiation to the east of boundary E. The Swope
Limestone also thickens and transforms from a carbonate-dominated interval
on the shelf (northwest) to become a mixed clastic and carbonate interval southeast of boundary E. This results in an overall change in the Nuyaka Creek GS
from mixed and evenly distributed carbonate and clastics to the northwest to
W. L. Watney . J. Kruger· J. c. Davis· J. Harff . R. A. Olea, . G. C. Bohling
relation with change. The Farley Limestone also thickens abruptly southeastward at boundary A. Dennis Limestone is thick and the accompanying density-neutron logs indicate thick, high porosity immediately to the east of boundaryB.
SAR boundary C borders the northwestern side of the location where the
Oread Limestone thins and apparently begins to downlap unto its underlying radioactive condensed section. Farther southeast the Oread Limestone is entirely
pinched out to where the overlying radioactive condensed section (Queen Hill)
rests on a condensed section which normally lies below the Oread Limestone.
The Oread Limestone is thick and porous immediately northwest of the C
boundary. The location of this downlap is also near the position where the
Douglas Limestone in the Douglas Group first appears. The Hertha Limestone
locally thickens and is lower in gamma ray radiation at boundary C.
SAR boundary D is the sight of probably the most dramatic changes in thickness. The limestone unit overlying the Oread Limestone (Deer Creek Limestone)
thins and apparently downlaps at this position. The Douglas Limestone first appears at this position and continues to thicken southeastward. The lower portion
of the Muncie Creek genetic set comprised of carbonate units thickens nearly
40% across this boundary. The Stanton Limestone at the top of the lower portion
of the Muncie Creek genetic set thickens 150% while the lola Limestone situated
at the base of this set thins southward across the D boundary. Below the Muncie
Creek genetic set, the Nuyaka Creek genetic set remains fairly constant in thickness. However, the Cherryvale Formation, residing in this lower set, thickens
20% on the southeast side of boundary D.
SAR boundary E is associated with another abrupt thickening in the Muncie
Creek GS, but this time all the limestones that had thickened dramatically at
boundary D have now downlapped unto the Muncie Creek condensed section
immediately northwest of boundary E. The Upper Muncie Creek genetic set that
is clastic dominated thickens nearly 200% southeastward replacing the section
that is equivalent to the carbonates in the lower Muncie Creek GS, which have
appears to have downlapped. A thick sandstone called the Stalnaker develops at
and southeast of boundary E at a stratigraphic position adjacent to the midportion of the carbonate bank before it downlapped. The Douglas Limestone in the
Upper Muncie Creek GS is also characterized by major southeastward thickening and lowering of the gamma radiation indicative of cleaner (less shaly) carbonate. Other internal changes in the Douglas interval include increased gamma
radiation shelfward (northwest) of boundary E, closely resembling the change
seen near boundary B. Modest thickening occurs in the Nuyaka Creek GS across
boundary E. The Dennis Limestone in the Nuyaka Creek GS thickens and becomes much lower in gamma radiation to the east of boundary E. The Swope
Limestone also thickens and transforms from a carbonate-dominated interval
on the shelf (northwest) to become a mixed clastic and carbonate interval southeast of boundary E. This results in an overall change in the Nuyaka Creek GS
from mixed and evenly distributed carbonate and clastics to the northwest to