Sedimentary Rocks Flashcards
Name the most common type of organic rock formed especially in humid regions.
Coal
Why rounding and sorting of grains depend on energy in which the rock is deposited in?
Energy is required to erode and transport clasts.
Identify the rock with the following properties.
- Homogeneous and soft.
- Grains are very fine that they cannot be seen through the hand lens.
Mudstone
Identify the rock with the following properties.
- Formed by precipitation of minerals different from cement.
Nodules
Identify the rock with the following properties.
- Rock containing clasts within ta a sandstone matrix.
- Cementation occurs during formation.
Conglomerate
Identify the rock with the following properties.
- Accumulation of carbonate shells of molluscs, corals and plankton.
- May contain abundant fossil fragments.
- They are usually white.
Limestone
Name the fragment of rocks seen within a rock.
Lithic-type fragments
Name the phenomenon that describes the pattern generated by the change of nature of sediment being deposited.
Lamination
Identify the rock with the following properties.
- Formed by the precipitation of saline solutions.
- Rock includes halite and gypsum minerals.
Evaporites
Name the process which loose sediment lithifies and becomes rock during burial.
Cementation
Identify the rock with the following properties.
- Grains are visible with the naked eye.
- Grains of minerals include quartz, feldspar, mica and iron oxides.
Sandstones
Identify the rock with the following properties.
- Formed by local cementation within sediments.
Concretions
Identify the rock with the following properties.
- Grains that are just visible with hand lens.
- Minerals are present, including fine grains of quartz and feldspar.
- Slightly harder than mudstone.
- Sometimes interbedded with mudstone.
Siltstone
