GEOL-1403
Sedimentary rock classification
Review the literature in the
introduction to sedimentary rocks
. After reviewing the literature,
select a sample number to identify the texture of the rock as either clastic, chemical, or biologic,
the grain size for clastic rocks only, and the composition and give the rock name. Complete and
submit the attached table for grading before the deadline.
Sedimentary rock classification
Sample
numbe
r
Texture
Grain size
Composition
Rock name
1
Biologic
No grain size
Calcite
Limestone
2
Biologic
No grain size
Calcite, almost entirely shell and
skeletal fragments
Coaquina
3
Chemica
l
No grain size
Gypsum
Rock Gypsum
4
Biologic
No grain size
Calcite with some shell and skeletal
fragments
Fossiliferous
Limestone
5
Clastic
<1/16 mm
Quartz, clay minerals
Siltstone
(Mudstone, Shale)
6
Clastic
>1/16 mm
feldspar, quartz
Arkose
7
Chemica
l
No grain size
Gypsum
Rock Gypsum
8
Clastic
>2 mm
rounded quartz, feldspar and rock
fragments
Conglomerate
9
Chemica
l
No grain size
silica (quartz)
Chert
10
Clastic
1/16 – 2mm
quartz, feldspar
Sandstone
11
Clastic
1/16 – 2mm
quartz, feldspar
Sandstone
12
Biologic
No grain size
densely compacted organic material
and plant fragments
Bituminous Coal
