quaternary interglacials Flashcards
1
Q
what dominated the glacial-interglacial cycle?
A
obliquity
2
Q
what has the last million years been dominated by?
A
eccentricity
3
Q
what is eccentricity?
A
shape
4
Q
when did the glacial-interglacial cycle become more pronounced?
A
last 600,000 years
5
Q
what was the last interglacial called?
A
MIS 5e
6
Q
what is the name for MIS-5e?
A
Ipswichian interglacial
7
Q
evidence in the MIS 5e?
A
- river terraces
- raised beaches
- coastal and inland caves across S Britain
8
Q
hominid evidence in the MIS 5e
A
- hominid fossils
- archaeological industries
- evidence of butchery
9
Q
what do river terraces do?
A
- respond to glacial-interglacial cycle
- incision and aggradation
- contain pollen
eg Trafalgar Square (Thames)
10
Q
what evidence do raised beaches provide?
A
- higher sl
- eg Portland Bill
11
Q
example of a borehole
A
- Bobbits hole
- 3.5m of organic rich muds, banded above and below by river gravels deposited during MIS 4 and MIS 6 glaciations
- muds contained ipswichian fauna and flora
12
Q
ipswhichian fauna
A
- hippo
- bison
- lion
- spotted hyena
13
Q
MIS 5e in the Arctic
A
- Bering Strait ice free
- N Alaska was rich in pollen, cones and leaves
- trees were growing c. 80km N of current extent in N America
- NE Siberia, larch is growing 600km further N
14
Q
temp in the MIS 5e
A
av 1.5°C warmer than today
15
Q
generally, what was different in the MIS 5e?
A
- warmer, wetter, high sl, smaller ice sheets, lower atm CO2 because of greater axial quality
