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Figure 20.2 Paleozoic Paleogeography ( continued )
60
°
60
°
30
°
30
°
Siberia
0 °
0
°
Laurentia
Baltica
30
°
30
°
Gondwana
60
°
60 °
Shallow sea
Deep ocean
Lowlands
Mountains
Glaciation
b Late Ordovician Period
60
°
60 °
Siberia
30 °
30 °
Kazakhstania
Laurentia
China
0 °
0 °
30 °
30
°
Gondwana
60
°
60
°
Shallow sea
Deep ocean
Lowlands
Mountains
c Middle Silurian Period
 
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