Geoscience Reference
In-Depth Information
Table 3.14
Rock type descriptor (adapted from AS 1726-1993, Mayne, 2001 and Geoguide 3, 1988).
Description
Sedimentary
Superficial
deposits
Grain
size mm
Chemically
formed
Organic
remains
Clastic (sediment)
Pyroclastic
Conglomerate
(rounded fragments)
Agglomerate
(round grains)
Boulders
200.00
Cobbles
60.00
Halite
gypsum
Coarse gravel
20.00
Breccia
(angular fragments)
Volcanic breccia
(angular grains)
Medium gravel
6.00
Fine gravel
2.00
Coarse sand
0.60
Coarse grained
tuff
Sandstone
Quartzite
Arkose
Greywacke
Medium sand
0.20
Chalk,
lignite,
coal
Fine sand
0.06
Silt
0.002
Mudstone
Siltstone
Fine grained tuff
Very fine
grained tuff
Clay
Shale
Claystone
Table 3.15
Rock type descriptor (adapted from AS 1726 - 1993, Mayne, 2001 and Geoguide 3, 1988).
Igneous (quartz content)
Pale
-----------------------------
>
Dark
Description
Metamorphic
Basic
(little to
none)
Superficial
deposits
Grain size
mm
Acid
(much)
Intermediate
(some)
Non-
foliated
Foliated
Boulders
200.00
Cobbles
60.00
Granite
Aplite
Granodiorite
Diorite
Babbro
Periodotite
Gneiss
Migmatite
Marble
Quartzite
Granulite
Hornfels
Coarse gravel
20.00
Medium gravel
6.00
Fine gravel
2.00
Coarse sand
0.60
Microgranite
Microdiorite
Dolerite
Schist
Serpentine
Medium sand
0.20
Fine sand
0.06
Silt
0.002
Rhyolite
Dacite
Andesite
Quartz
Trachyte
Basalt
Phyllite
Slate
Clay
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