A lithostratigraphical framework for the Carboniferous successions of

Distribution and regional correlation
limited to a series of inliers in the southern part of the
Askrigg Block, North yorkshire including Kilnsey [sd 97
68], langcliffe [sd 82 65], and Austwick [sd 77 68].
Age and biostratigraphical characterisation
Arundian to Holkerian. Biostratigraphically important
fossils recorded within the formation include foraminifers
(diagnostic of both stages), Delepinea carinata (which is
characteristic of the Arundian), and Lithostrotion sensu
stricto (cerioid), which is not recorded below the base of the
Holkerian (mitchell, 1989).
Formal subdivisions
see also Appendix 1. members of the Kilnsey Formation in
ascending stratigraphical order include:
6.6.16.1 sCaleBer ForCe liMesTone MeMBer (sFlM)
Name
The name is derived from scaleber Force [sd 8407 6256].
it was previously known as the Kilnsey limestone-withmudstone
member and originally defined by Hudson
(1930). Arthurton et al. (1988) is the principal reference.
Lithology
Bioturbated, well-bedded, fine- to coarse-grained dark
limestones (packstones and subordinate wackestones),
generally argillaceous with common detrital quartz, and
with common mudstone partings and interbeds up to 1.8 m
thick.
Stratotype
The type locality is scaleber Force [sd 8407 6256]
where a 22 m section is exposed. A reference section is
the Cominco s7 Borehole (BGs Registration Number
sd86se/6) [sd 8541 6378] near settle, North yorkshire,
which includes the full thickness of the member from 58.5
to 120.1 m depth.
Lower and upper boundaries
The base of the scaleber Force limestone member is drawn
where the dark limestones rest sharply and conformably on
paler grainstone of the Chapel House limestone Formation
(Figure 15, Column 6).
The top of the member is taken where the dark grey
limestones of the scaleber Force limestone member are
overlain by mid–dark grey limestone of the scaleber Quarry
limestone member.
Thickness
North of the middle Craven Fault the member is 22–58 m
thick. south of the fault it is 61.6 m thick at the type locality
(see Stratotype above).
Distribution and regional correlation
The member occurs in a series of inliers in the southern part
of the Askrigg Block, North yorkshire, including Kilnsey
[sd 97 68], langcliffe [sd 82 65], and Austwick [sd 77 68].
Age
Arundian.
6.6.16.2 sCaleBer Quarry liMesTone MeMBer (sQlM))
Name
The name is derived from scaleber Quarry [sd 9225 5328].
it was previously known as the Kilnsey limestone and originally
defined by Hudson (1930). Arthurton et al. (1988) is
the principal reference.
British Geological Survey
Research Report RR/10/07
104
Lithology
well-bedded, thin and thick beds of mid and mid–dark grey,
fine- to coarse-grained limestone, with minor mudstone
beds. Bioclastic packstones characterise the lower part of
the member, passing up to packstones and grainstones.
Bands and nodules of black chert occur locally in the lower
part of the member.
Stratotype
The type locality is scaleber Quarry [sd 8407 6263] where
a 12 m section 18 m above the base of the member is
exposed. Reference sections are provided by the Cominco
s2 Borehole (BGs Registration Number sd86sw/6) [sd
8491 6345] at low Barn, stockdale Beck, from 224.2?
to 363.9? m depth, and Kilnsey Crag [sd 9735 6846]
where 29 m are exposed at outcrop in a cliff section.
Both reference sections include the top and base, and full
thickness, of the member.
Lower and upper boundaries
The base is taken where the mid grey limestone of the
scaleber Quarry limestone member overlies the dark grey
limestone and mudstones of the scaleber Force limestone
member (Figure 15, Column 6). This boundary is typically
gradational and for convenience the base is taken at the top
of the highest prominent mudstone.
The top of the member is drawn at the conformable,
gradational and slightly diachronous upward passage from
mid–dark grey limestone of the scaleber Quarry limestone
member to the pale grey limestone of the Cove limestone
member (malham Formation).
Thickness
up to 134 m thick in the Cominco Borehole s2, decreasing
to 29 m at Kilnsey Crag (see above).
Distribution and regional correlation
The member occurs in a series of inliers in the southern part
of the Askrigg Block, North yorkshire, including Kilnsey
[sd 97 68], langcliffe [sd 82 65] and Austwick [sd 77
68].
Age and biostratigraphical characterisation
Holkerian. The member contains an abundant macrofauna
characterised by cerioid and fasciculate lithostrotionid
corals.
6.6.17 Malham Formation (MALM)
Name
see Arthurton et al. (1988) and mundy and Arthurton
(1980). malham Cove [sd 8975 6411] occurs in yorkshire
near the village of malham, east of settle.
Lithology
The formation includes massive- to weakly bedded,
pale grey to very pale grey, medium- to coarse-grained
calcarenite packstones and grainstones, and well bedded,
thick- to very thick-bedded, mid–pale to very pale grey,
calcarenite packstones, wackestones and subordinate
grainstones.
Genetic interpretation
limestone deposition on a rimmed marine shelf. The Cove
limestone member in shallow water well within fairweather
wave-base, and the Goredale limestone member in
cyclical shallow water with emergent episodes (see Cossey
and Adams, fig. 5.21 in Cossey et al., 2004).