43:34

Radiometric Dating - Part 2

24:24

Correlation - Part 2

26:33

Interpreting Geologic Maps - Part 2

21:17

Modelling Precambrian Surface Conditions - Part 1

35:28

Precambrian Formation of North America - Part 2

19:33

Patterns in Evolution - Part 1

21:53

Evolutionary Relationships of Vertebrates

37:42

Faunal Succession and Depositional Sequences - Part 1