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F792 2.3.4a Clastic Sed. Identification: Worksheet
(a) (i)
What are the sizes and terms used to define clastic sedimentary rocks? Give one
example of a sedimentary rock that shows each grain size.
2 to 0.0625mm
sizes
Comp.
/23
clay
Conglomerate
rock
examples
(4)
(ii)
Compare the energy conditions under which fine and course grains are
deposited
.................................................................................................................................................
............................................................................................................................................ (1)
(b) (i)
Define the term sorting.
.................................................................................................................................................
............................................................................................................................................ (1)
(ii) Draw two sketches in the spaces below to show a well sorted sediment and a
poorly sorted sediment.
(2)
Well sorted
(c) (i)
Poorly sorted
How does grain shape vary with the degree of transportation?
.................................................................................................................................................
............................................................................................................................................ (1)
(ii) Draw a diagram below to show the shape of the grains in a wind blown desert
sand and in a glacial breccia.
Wind blow desert sand
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Glacial Breccia
(2)
(d) (i)
What does the term laminated mean?
.................................................................................................................................................
............................................................................................................................................ (1)
(ii)
What rock type often shows laminations?
............................................................................................................................................ (1)
(iii) What grain size is the rock mentioned above and what minerals does it contain?
.................................................................................................................................................
............................................................................................................................................ (2)
(e) (i)
term?
Desert sandstones are usually mineralogically mature. What is meant by this
.................................................................................................................................................
............................................................................................................................................ (1)
(ii)
Describe the mineral content and appearance of a desert sandstone?
.................................................................................................................................................
.................................................................................................................................................
............................................................................................................................................ (3)
(f) Sandstones can show many different features. Complete the table below to show the
distinguishing features of the following sandstones.
Limestone
Features
Greywacke
Orthoquartzite
Desert
Sandstone
Arkose
(4)
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