http://earthwise-staging.bgs.ac.uk/index.php?action=history&feed=atom&title=Millyeat_MemberMillyeat Member - Revision history2026-04-17T15:56:36ZRevision history for this page on the wikiMediaWiki 1.42.3http://earthwise-staging.bgs.ac.uk/index.php?title=Millyeat_Member&diff=52947&oldid=prevDbk: 1 revision imported2021-07-26T14:54:03Z<p>1 revision imported</p>
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<p><b>New page</b></p><div>== Millyeat Member [http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=MYTB (MYTB)], Carboniferous, Northern England Province ==<br />
Millyeat Member is a member of the [[Whitehaven Sandstone Formation]] and part of the [[Warwickshire Group]]<br />
=== Name ===<br />
See Akhurst et al. (1997<ref name="akhurstetal97">Akhurst, M C, Chadwick, R A, Holliday, D W, McCormac, M, McMillan, A A, Millward, D, and Young, B.1997.Geology of the west Cumbria district.''Memoir of the British Geological Survey'', Sheets 28, 37 and 47 (England and Wales).</ref>); also Brockbank (1891<ref>Brockbank, W.1891.On the occurrence of the Permian, ''Spirorbis'' limestones, and Upper Coal Measures at Frizington Hall in the Whitehaven district.''Memoir of the Proceedings of the Manchester Literary and Philosophical Society'', Vol. 4, 418–426. </ref>); Eastwood et al. (1931<ref>Eastwood, T, Dixon, E E L, Hollingsworth, S, and Smith, B.1931.The geology of the Whitehaven and Workington District.''Memoir of the Geological Survey'', Sheet 28 (England and Wales).</ref>); Jones (1993<ref>Jones, N S.1993.Stratigraphical and sedimentological characteristics of the ‘Whitehaven Sandstone Series’, Westphalian C, West Cumbria coalfield.''British Geological Survey Technical Report'', WH/93/102R.</ref>). In the former name ‘Millyeat Beds Member’ the term ‘Beds’ has now been abandoned.<br />
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=== Lithology ===<br />
A thick heterogeneous, dominantly red succession of purple–red mudstone, with subsidiary sandstone and siltstone, and minor ‘marl’, thin coals and thin beds of limestone with ''Spirobis'' sp.<br />
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=== Genetic interpretation ===<br />
The member was deposited in interdistributary bay or lacustrine environments with minor river channels (Akhurst et al., 1997<ref name="akhurstetal97" />). The reddening was either primary or early diagenetic.<br />
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=== Stratotype ===<br />
The type section is the Frizington Hall Borehole (BGS Registration Number NY01NW/174) (NY 0189 1710) from 12.8 to 155 m depth. A reference section is the Millyeat Borehole (BGS Registration Number NY01NW/175) (NY 023 178) from about 7.5 to 158 m depth.<br />
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=== Lower and upper boundaries ===<br />
The base of the unit is the top of the highest major channel sandstone unit in the Bransty Cliff Sandstone Member (Figure 14, Column 1).<br />
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The upper boundary of the member is the sub-Permian unconformity, which is overlain by the coarse, poorly bedded, poorly to moderately sorted, generally massive, matrix or clast-supported, typically pebble-grade, breccias of the Permian Brockram (Appleby Group).<br />
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=== Thickness ===<br />
Up to 180 m maximum.<br />
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=== Distribution and regional correlation ===<br />
West Cumbria Coalfield.<br />
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=== Age ===<br />
Bolsovian (Westphalian C) to Asturian (Westphalian D).<br />
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== References ==<br />
<references/><br />
[[Category:Carboniferous lithostratigraphical nomenclature]]</div>Geosource>Volunteer 01