Page 95 - Sedimentology and Stratigraphy

82 Field Sedimentology, Facies and Environments

Example log with facies
LIMESTONES
rud &
pack
grain
Scale (m) Lithology MUD mud wacke SAND GRAVEL bound Structures etc Facies name Facies code Facies facies association
clay silt vf m vc gran pebb cobb boul 123456789
c
f
laminated siltstone Zl
sandstone with roots Sr
laminated siltstone Zl
coal K
9 laminated siltstone Zl
sandstone with roots Sr Vegetated
coastal plain
coal K
laminated siltstone Zl
8
sandstone with roots Sr
coal K
laminated siltstone Zl
7 sandstone with roots Sr
laminated fine Sl
sandstone
bioturbated M
mudstone
6
wave rippled
medium sandstone
M Shallow marine
bioturbated clastic
mudstone
(shoreface)
laminated fine Sl
5
sandstone
Sw
wave rippled
medium sandstone
bioturbated M
mudstone
4 wave rippled Sw
medium sandstone
M
bioturbated
mudstone
Bioclastic grainstone
3
Lgb
2 Bioclastic packstone Shallow
Lpb carbonate
facies
sequence
(shallowing-up)
bioclastic
wackestone Lwb
1

Fig. 5.12 A graphic sedimentary log with facies information added. The names for facies are usually descriptive.
Facies codes are most useful where they are an abbreviation of the facies description. The use of columns for each facies
allows for trends and patterns in facies and associations to be readily recognised.