Vocabulary

Geo-Seas adjusted Folk sediment lithology classes

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URI

http://vocab.nerc.ac.uk/collection/GS3/current/

Description

Terms 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).

Geo-Seas

2010-10-15

GS3

British Oceanographic Data Centre

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