Late Paleozoic earth history 2 Flashcards
1
Q
when did Coal form
A
during the late carboniferous
2
Q
what is the significance of coal
A
- provides much of the electricity of US
- Important in steel production
3
Q
where can coal be gotten
A
mine underground and on the surface through exposed seams
4
Q
What are Cyclothems
A
repetitive pattern of marine and non-marine environments
5
Q
what do cyclothems represent
A
transgressive and regressive cycles separated by unconformities
6
Q
What are the idealized conditions of Cyclothems
A
- non-marine unit at the base
- coal swamp
- Marine unit on top
7
Q
how is coal created
A
- dead plants when decomposed with the addition of pressure and heat
8
Q
What are the different types of coal
A
- Lignite ( worst type )
- Sub-bituminous
- Bituminous
- Anthracite ( best type )
9
Q
What caused Rocky Mountain Uplift
A
severe intracratonic deformation occurred in North American during the Pennsylvanian period
10
Q
What may have caused the Rocky Mountain Uplift
A
The collision of Gondwana with Laurasia along the Ouachita mobile belt
