Page 45 - Carbonate Platforms Facies, Sequences, and Evolution

40
highs
y
Edale
1989).
formed
(Fraser
interior
10km
These
lC
carbonate
in
•o
Fault
rr::::::J Dinantian
0 Dinantian
12] Dinantian
� lnversio�
c:::::n Exposed.
These
.. ,
margin of the
the
'
geometry of the
settings
y Nor;;;� I Fault
., .--
Low
High
margin
bioclastic
(Fig. 1). The
sand
.
which
.
et al., 1990).
.
....
Structure
.
Edale
.
footwall
(Lee,
.......
shoals
of
shoals
occur between Castleton and
(Gutteridge,
controlled
1988;
the
are
the
1983,
developed
time along the northern margin of the
Bradwell
R. L.
equivalent
Gawthorpe
1987,
location
Dale
around
to
Derbyshire carbonate platform
et
were located on a series of fault-controlled structural
areas of shallow-water carbonate deposition which
Monsal Dale and the lower part of the Eyam Lime­
down-to-the-north
Derbyshire carbonate platform
the north. The southern platform margin is located
on the hangingwall of the Hoton Fault which forms
and
Basin in its hangingwall to
fol­
Scattered exposures of this bioclastic shoal complex
The bioclastic (mainly crinoidal) shoals described
carbonate platform, which is inferred to be a footwall
the
the major controlling fault of the Widmerpool Basin
views of the internal geometry of this shoal complex.
stones which were deposited in a variety of platform
the
al.,
lowing a change in the nature of the platform margin
(Fig.
2). Three large sections in Pin Dale, Hope Cement
1989).
Works Quarry and Bradwell Dale provide excellent
here formed during late Asbian to early Brigantian
Derbyshire
Gawthorpe and P.
�
y
change
!ill] Shoal
PLATFORM
(Gawthorpe
D Dinantian
CARBONATE
Namurian
Gutteridge
coincided
Complex
Platform Margin
younger Namurian cover.
1km
footwall to the Edale fault.
this paper are located at the
in the text and the approximate limits of the shoal
complex. Note·that the eastward extent of the shoal
complex and the platform margin are masked by the
Midlands showing the location of
the exposed Derbyshire carbonate
platform (DCP). The shelf-margin
carbonate sand bodies discussed in
Fig. 1. Dinantian palaeogeography
and structural setting of the Central
northern margin of the DCP, in the
Fig. 2. Location map showing the main sections described
the late Asbian (Broadhurst & Simpson, 1973). The
with a phase of active extension
from a high to a low angle rimmed margin during
et al., 1989). This extensional episode
which is recognized over much of northern England