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Vocabulary

Geo-Seas adjusted Folk sediment lithology classes

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URI http://vocab.nerc.ac.uk/collection/GS3/current/
DescriptionTerms used to categorise sedimentary rocks and sediments in terms of the proportion of gravel, sand and mud. Initial terms proposed by Folk (1954) but subsequently revised by BGS and Flemming (2000).
CreatorGeo-Seas
Modified2010-10-15
Version Info1
Identifier GS3
Register Manager British Oceanographic Data Centre
Register Owner Geo-Seas
Members
Identifier PrefLabel Definition Date
G gravel Sand:mud ratio = all ratios and gravel percentage >80 2010-10-14
gM gravelly mud Sand:mud ratio = <1:1 and gravel percentage 5-30 2010-10-14
gmS gravelly muddy sand Sand:mud ratio = 1:1 to 9:1 and gravel percentage 5-30 2010-10-14
gS gravelly sand Sand:mud ratio = >9:1 and gravel percentage 5-30 2010-10-14
M mud Sand:mud ratio = <1:19 and gravel percentage <1 2010-10-14
mG muddy gravel Sand:mud ratio = <1:1 and gravel percentage 30-80 2010-10-14
mS muddy sand Sand:mud ratio = 1:1 to 3:1 and gravel percentage <1 2010-10-14
msG muddy sandy gravel Sand:mud ratio = 1:1 to 9:1 and gravel percentage 30-80 2010-10-14
S sand Sand:mud ratio = >19:1 and gravel percentage <1 2010-10-14
sG sandy gravel Sand:mud ratio = >9:1 and gravel percentage 30-80 2010-10-14
sM sandy mud Sand:mud ratio = 1:3 to 1:1 and gravel percentage <1 2010-10-14
(g)M slightly gravelly mud Sand:mud ratio = <1:9 and gravel percentage 1-5 2010-10-14
(g)mS slightly gravelly muddy sand Sand:mud ratio = 1:1 to 9:1 and gravel percentage 1-5 2010-10-14
(g)S slightly gravelly sand Sand:mud ratio = >9:1 and gravel percentage 1-5 2010-10-14
(g)sM slightly gravelly sandy mud Sand:mud ratio = 1:9 to 1:1 and gravel percentage 1-5 2010-10-14
(m)S slightly muddy sand Sand:mud ratio = 3:1 to 19:1 and gravel percentage <1 2010-10-14
(s)M slightly sandy mud Sand:mud ratio = 1:19 to 1:3 and gravel percentage <1 2010-10-14