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==Askham Limestone Member [http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=ASKL (ASKL)], Carboniferous, Northern England Province ==

=== Name ===
Named after the village of Askham, east Cumbria. See Rowley (1969)<ref name="Rowley69">Rowley, C R.1969.The stratigraphy of the Carboniferous Middle Limestone Group of West Edenside, Westmorland.''Proceedings of the Yorkshire Geological Society'', Vol. 37, 329–350.</ref>, and Burgess and Holliday (1979<ref name="BandH">Burgess, I C, and Holliday, D W.1979.Geology of the country around Brough-under-Stainmore.''Memoir of the Geological Survey of Great Britain'', Sheet 31, parts 25 and 30 (England and Wales).</ref>); Dunham (1990)<ref name="Dunham90">Dunham, K C.1990.Geology of The Northern Pennine Orefield: Volume 1, Tyne to Stainmore (2nd edition).''Economic Memoir of the British Geological Survey'', Sheets 19 and 25, parts 13, 24, 26, 31 and 32 (England and Wales)</ref>; Arthurton and Wadge (1981)<ref name="AandW">Arthurton, R S, and Wadge, A J.1981.Geology of the country around Penrith.''Memoir of the Geological Survey of Great Britain'', Sheet 24 (England and Wales)</ref>; McCormac (2001)<ref name="Mccormac">McCormac, M.2001.The Upper Palaeozoic rocks of the Shap and Penrith district, Edenside, Cumbria.''British Geological Survey Research Report'', RR/01/10.</ref>.

=== Lithology ===
Limestone, dark grey, well-bedded, wackestone and packstone, porcellanous in parts. Prominent layers with algal oncoliths and coral colonies. The member is split into 2 leaves by a thin layer of red-brown mudstone.

=== Stratotype ===
The type section is an abandoned roadside (east side of minor road) quarry (NY 583 171) beside Wintertarn Farm, by Shap, Cumbria (Rowley, 1969<ref name="Rowley69"></ref>) where the limestone, a mid grey biomicrite, is divided into two parts by an algal horizon, most likely the equivalent of the ''Girvanella'' Bed of Garwood (1913)<ref>Garwood, E J.1913.The Lower Carboniferous succession in the north-west of England.''Quarterly Journal of the Geological Society'', Vol. 68, 449–596.</ref>. A reference section is the Flusco Lodge disused quarry (NY 474 282), 3.8 km west of the M6 Penrith interchange, where a full section of the limestone is preserved, along with the top part of the underlying Wintertarn Sandstone Member, Tyne Limestone Formation (McCormac, 2001<ref name="Mccormac"></ref>).

=== Lower and upper boundaries ===
The base of the member is sharp, occurring at the base of a limestone bed overlying the mainly sandstone of the Wintertarn Sandstone Member, Tyne Limestone Formation (Figure 14, Column 3).

The upper boundary of the member is taken at the base of the overlying shelly marine mudstone within the Alston Formation Yoredale facies depositional cycle.

=== Thickness ===
Between 12 and 14.7 m.

=== Distribution and regional correlation ===
North Cumbria and Edenside, west of Pennine–Dent Fault zone.

=== Age ===
Asbian to Brigantian.

== References ==
<references/>
[[Category:Carboniferous lithostratigraphical nomenclature]]

Askham Limestone Member - Revision history

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Geosource>Volunteer 01 at 10:33, 4 August 2015