Page 61 - Carbonate Platforms Facies, Sequences, and Evolution

A
the
rise
The
storm
quarry
in
peloidal
occurred
meteoric
shelf
migration.
agreement
Derbyshire
complex
unmicritized
internal
establishment
activity
of
with
manager
during
sea-level
of
margin.
sediment
energy conditions.
were
diagenesis
of
the
'fresh'
low
carbonate
of the
geometry
The
pauses
These
both
of
in
reflecting
energy
E-W or
20-25 m.
associated
sediment
platform
of the facies complex as a whole.
these
grainstone
CONCLUSIONS
Blue Circle
bedforms
important
with
Tidal
pauses
is
bioclastic-carbonate
migration
ACKNOWLEDGEMENTS
in
shoal
during
in
conditions,
deposited
and
sand
the
or
currents
subaerial
developed
ex­
sub­
bedding configurations. These shoal sequences con­
during
by vertical accretion which is followed by a phase of
bedform
paper. RLG acknowledges support from the Durham
and AI Fraser of BP and Maurice Tucker of Durham
Hope Cement
Works Quarry for allowing us to work in the quarry
The authors would like to thank Mr Peter Dumenil,
University for commenting on the contents of the
shoal complex, resulting in basinward progradation
controlling
Dinantian storm tracks deduced by Schofield (1982).
basinward position throughout the deposition of the
indicates an initial stage of development dominated
SE-NW prevailing
energy events planing-off the bedform topography,
a maximum of 500-700 rn and are seen to spill over
Abandonment of the bedforms took place by high
basinward progradation. The bedforms prograde by
episodes of bedform migration and highly micritized
the internal geometry of the shoals. The bedforms
are made up mainly of bioclast grainstone with local
packstone and wackestone, the latter reflecting lower
shoals
and
emergent surfaces, probably in response to a relative
during
along strike developed at the northern margin of the
late
a mixture of
some 2 km wide and extending for several kilometres
on
sequences
into several shoal sequences separated by sequence
Asbian and early Brigantian. This complex is divided
tain clinoforms which represent large-scale bedforms.
boundaries recognized by toplap, onlap and downlap
aerial exposure. Early cementation of the bedforms
posure. The bedforms nucleated in a progressively
LEE,
HINE,
HINE,
Isles
The
EDEN,
play
Fellows.
central
of
margins
A.G.
ScHOFIELD,
A.C.
Limestone
Limestone
GuTTERIDGE,
GuTTERIDGE,
(Eds
(in press).
Limestone
A.C.,
22, 25-41.
Platform-margin bioclastic shoals,
and
K.
P.
of
of Manchester.
facing
(1988)
UK
Bull. Geol. Surv.
(1977)
Derbyshire. Q. J.
R.A., ORME,
FRASER, A.J., NASH,
the
northern
WILBER,
(1982)
Soc. 6, pp. 171-187.
and Applied Aspects
(1989)
northern
open
Formation
Arthurton,
Lily
Formation,
SHIRLEY, J. & HORSFIELD,
G. B., Sheet 99, p. 444.
in
R.J.
Upper .Carboniferous
R.S.,
Castleton
&
the
England.
Bank,
of
seaways
Controls
England
active oolite sand shoal. J. Sed.
-
Carboniferous
thesis, University of Manchester.
in
east
In:
on
Derbyshire.
G.B. 21, 73-118.
Sedimentology
G.R., MITCHELL,
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