Lecture 2.6 - Marina Sedimentary Rocks Flashcards
1
Q
Define sorting (size)
A
Grains of rock are equal in size
2
Q
Quartz sandstone is found in what environment
A
Beach environment
3
Q
What environment is shale found in
A
Lagoons
4
Q
What environment is limestone found in
A
Reef
5
Q
What are the reef requirements
A
- shallow water (<200ft deep)
- warm water (>72 degrees)
- lack of clastic input (need clean water)
6
Q
What environment is chert found in
A
In deep marine environment
- Abyssal plain
7
Q
Where are asymmetrical ripples found (arkose)
A
Fluvial (rivers)
8
Q
Where are symmetrical ripples found (quartz sandstone)
A
Beach
9
Q
Where is graded bedding found (graywacke)
A
Rise
10
Q
Where is laminar bedding found (rock gypsum)
A
Evaporite basin
11
Q
Where is cross bedding found (quartz sandstone)
A
Dunes
12
Q
Where are mud-cracks (desiccation) found (mudstone)
A
Floodplain, lake beds, and tidal flats
