He inherited, or Sancho el Mayor1000-1035acquired, superiority over the central Pyrenean regions of Aragon and Sobrarbe.
Archean rocks are exposed in the north of the Peninsula, particu larly along the great Pyrenean axis, in Galicia, Estremadura, tb Sierra Morena, the Sierra Nevada and Serrania de Ronda.
The oldest Palaeozoi strata are referred, from their included fossils, to the Cambrian Ordovician and Silurian systems. They range through a vas region of Andalusia, Estremadura, Castile, Salamanca, Leon arii Asr,urias, and along the flanks of the Pyrenean and Cantabria~ chain.
The higher members comprise massive hippurite limestones, and in the Pyrenean district representatives of the upper subdivisions of the system, including the Danian.
This threefold division is only valid so far as the elevation of the Pyrenean chain is concerned, and does not accurately represent its geological structure or general configuration.