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<p><b>New page</b></p><div>== Main Algal Member (MAN), Carboniferous, Northern England Province==<br />
Main Algal Member is part of the [[Lyne Formation]].<br />
=== Name ===<br />
Previously known as the Main Algal Limestone Beds (Day, 1970)<ref name="day70"> Day, J B W. 1970. Geology of the country around Bewcastle.''Memoir of the Geological Survey of Great Britain'', Sheet 12 (England and Wales).</ref>. See also Leeder (1974)<ref>Leeder, M R. 1974. Lower Border Group (Tournaisian) fluviodeltaic sedimentation and palaeogeography of the Northumberland Basin.''Proceedings of the Yorkshire Geological Society'', Vol. 40, 129–180.</ref>.<br />
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=== Lithology ===<br />
Rhythmic alternations of limestone and mudstone with 14 well developed nodular algal beds and subsidiary sandstone and siltstone.<br />
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=== Stratotype ===<br />
The type section is in Birky Cleuch from (NY 5885 7540 to 5932 7538) a tributary of the Kirk Beck at Bewcastle. Here, a complete sequence from M.A.1 to M.A.14, about 87 m thick is exposed (Day, 1970)<ref name="day70" />.<br />
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=== Lower and upper boundaries ===<br />
At Bewcastle, the lowermost algal bed (M.A.1 of Day, 1970)<ref name="day70" /> of the Main Algal Member lies conformably on the [[Bewcastle Member]] (Figure 11, Column 2), which comprises cyclical sequences of sandstone, siltstone, and mudstone, with thin limestones and ‘cementstones’.<br />
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At the top of the Main Algal Member, the top of the uppermost algal bed (M.A.14 of Day, 1970)<ref name="day70" /> is conformable with the overlying Lower ''Antiquatonia'' Bed of the [[Cambeck Member]], which comprises rhythmic cycles of mainly sandstones, thin limestones and mudstones.<br />
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=== Thickness ===<br />
Some 87 m at Bewcastle.<br />
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=== Distribution and regional correlation ===<br />
The Northumberland–Solway Basin, but described only in the Bewcastle region (Day, 1970)<ref name="day70" />.<br />
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=== Age ===<br />
Arundian.<br />
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== References ==<br />
<references/><br />
[[Category:Carboniferous lithostratigraphical nomenclature]]</div>Geosource>Volunteer 01