Geology Reference
In-Depth Information
PU
MS
MO
ORDOVICIAN-SILURIAN
UNCONFORMITY
N
C5
FR
CA
S
C4
MYO
AD
BU
CL
CU
W
C3
R
U
SH
Pw
C2
C5
C3/4
BR
V
V
C
GARRARD
C
C2
C1
BB
G
FW
FN
M6
CSQ
F
C
w
M6
Fig. 5.
Regional north-south cross-
section of M5-C5 strata on the
Cincinnati Arch. Initials are locations
of measured sections, see Pope & Read
(1997b) and Holland & Patzkowsky
(1996, 1997, 1998) for individual sec-
tions. Note how sedimentation and
stratigraphy in M5 and M6 are simi-
lar but there is a signifi cant change
in sedimentation and stratigraphy
during C1-C5.
M5
Hc
M5
Cn
Na
Fy
MR
L
BP
DH
MD
H4O
HA
NI
M4/M5 UNCONFORMITY
BO
MYC
40 m
PERITIDAL
FENESTRAL
LIME MS.
PERITIDAL
SILTY
DOLOMITE
PERITIDAL
SKELETAL
SHOALS
PERITIDAL
MARINE
SILTSTONE
SUBTIDAL
100 km
TACONIC C2 - C5
SILTY DOLOMITE
TACONIC M5 - M6
OHIO
50 km
OHIO
INDIANA
N
CORE LOCATION
INDIANA
N
MEASURED SECTION
CORE LOCATION
WEST
VIRGINIA
WEST
VIRGINIA
50 km
X
OUTCROP
BELT
MEASURED SECTION
KENTUCKY
GARRARD
SILTSTONE
VA
NA
VIRGINIA
KENTUCKY
PERITIDAL
FENESTRAL
LIME MS.
PERITIDAL
SILTY
DOLOSTONE
TENNESSEE
TENNESSEE
PERITIDAL
SKELETAL SHOAL
PERITIDAL
MARINE SILTSTONE
OUTCROP
BELT
SHALLOW SUBTIDAL
SUBTIDAL CARBONATE
AND SHALE
ALABAMA
STORM - DEEP SUBTIDAL
ALABAMA
Fig. 7.
Map of shallow-water features of the C2-C5
sequences, including silty peritidal dolomite and the tid-
ally infl uenced Garrard Siltstone, both of which were
deposited along the Cincinnati Arch.
Fig. 6.
Map showing distribution of facies during the
M5 and M6 sequences along the Cincinnati Arch. Note
restriction of peritidal and shoal facies to a stable belt
during this interval.
Bigby-Cannon limestone (Holland & Patzkowsky,
1997). Peritidal caps in the Bigby-Cannon and
Catheys are thicker and more numerous along
the western side of the Nashville Dome (Wilson,
1949), suggesting that the western fl ank of this
dome was a persistently shallow region during
the M5 and M6 sequences. As waters continued to
deepen during the M6 and C1 sequences, peritidal
facies became exceedingly rare, only occurring as
isolated islands within grainstone shoals on the
Jessamine Dome (e.g. Devils Hollow Member of
the Lexington Limestone, Cressman, 1973; Pope &
Read, 1997a; Ettensohn
et al
., 2004) and restricted
to the southern margin of the Nashville Dome in
the Catheys and Inman formations (Wilson, 1949;
Holland & Patzkowsky, 1998). Peritidal facies
in the Inman Formation are green dolomitic
mudstones with desiccation cracks.
Peritidal facies (Tate, Terrill, Rowland, Saluda
and Preachersville Members) occur in the
Cincinnatian (C2-C5) over the Jessamine Dome
(Fig. 7) and nearly everywhere consist of silty
