BRN 9-4 - Flipbook - Page 67
different origin and age from that of the San Andres
Mountains to the north (and the Franklin Mountains to the
south).
The blue colors on the geologic map shown on the next
page show that the San Andres Mountains are much older
than the Organ Mountains. They date from the Paleozoic
and are sedimentary. ÒPhÓ, the Hueco Formation, and ÒIPpsÓ,
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