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Lower Permian

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Lower Permian [′lō·ər ′pər·mē·ən]
(geology)
The earliest epoch of the Permian period of geologic time, extending from about 275- to 260,000,000 years ago.


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After incorporating palynological data in the 1980s, the chronostratigraphical sequence for the Palaeozoic was established as follows: The Lower Permian Haushi, being of Hercynian uncomformity.
Specific topics include Silurian-bearing terranes of Alaska, the significance of detrital zircons in Upper Devonian ocean-basin strata of the Sonora allochthon and Lower Permian synorogenic strata of Mina Mexico foredeep in central Sonora, and Late Triassic mixed carbonate-volcaniclastic facies of the Olds Ferry terrane in eastern Oregon and western Idaho.
But all the Silurian, most of the Devonian and a major part of the Carboniferous and Lower Permian sequences are missing.
 
 
 
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