Paleoenvironmental Reconstruction Flashcards Preview

GEO1211: History Of Our Planet > Paleoenvironmental Reconstruction > Flashcards

Flashcards in Paleoenvironmental Reconstruction Deck (14)
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1
Q

Benefit and drawback of using ocean sediment to predict past environments

A

Extend back billions of years but there is varied resolutions

2
Q

Chironomids are used as proxies for

A

Temperature

3
Q

Pollen is used as a proxy for

A

Vegetation

4
Q

Dust is a proxy for

A

Aridity

5
Q

What is the most dominant form of oxygen on the planet

A

16O

6
Q

What is dendroclimatology

A

Looking at info from tree rings

7
Q

What is the law of superposition

A

Older sediments on bottom, youngest on top

8
Q

The Cambridge half life of radio carbon (14C) is how long

A

5730 +- 40 years

9
Q

The total number of MIS identified in the quaternary now exceeds what

A

100

10
Q

Oxygen isotopes can be used as a proxy for what

A

Precipitation

11
Q

The earths axil tilt has been calculated as

A

23.44 degrees

12
Q

Eccentricity refers to which planetary cycle

A

Changes in the shape of the earths orbit

13
Q

One complete cycle of obliquity takes how long

A

41,000 years

14
Q

How much higher were temperatures in the last interglacial relative to present

A

2 degrees Celsius