Arkell.1956.Jurassic..

576 THE ANDES OF SOUTH AMERICA
The inner cordillera, with its chain of youthful volcanoes, was upheaved
in two further spasms, in the early and late Tertiary. These movements
involved further folding of the Mesozoic rocks and some metamorphism,
with uplifts of up to 14,000 ft. in the central Andes, and were accompanied
by further massive outbursts of volcanic activity.
FIG. 93.—Palaeogeographic sketch-map of South America in the Lower and Middle
Jurassic, with the principal marine extensions in the Tithonian or Neocomian or
both. Based on Weeks, 1947.
According to Gerth, the leading authority on the Andes (1939, p. 59),
the four successive stages of uplift (Upper Jurassic, Upper Cretaceous,
early Tertiary, late Tertiary) were accomplished in waves which moved
from west to east, each wave of uplift farther east than its predecessor
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