Lower Permian

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.
References in periodicals archive ?
The Lower Permian Haushi, being of Hercynian uncomformity.
Monographic studies of fusulinids from the lower Permian of West Pakistan.
Since the 1980s, the Wolfcamp shale in the Midland Basin has been part of the Wolfberry play that encompasses Mississippian, Pennsylvanian, and Lower Permian reservoirs.
Corisaccites alutas is a miospore of unique morphology which has mostly been recorded from the lower Permian deposits.
The Cook Ranch Field produces from a very permeable lens of Cook Sand of lower Permian or upper Pennsylvanian age, occurring at an average depth of 1,300 ft.
By analogy with the Korat syncline, a complex system of graben may be present and may be filled with Upper Carboniferous to Lower Permian and Upper Permian to Middle Triassic terrigenous-carbonate and volcanoclastic units, with a total thickness exceeding 1000m.
The wings of these two taxa were considered to have synapomorphies of the Holometabola, although eventually these taxa were removed from the Holometabola for different reasons--Metropator because its affinities where shifted to a nonholometabolous group, and Fatjanoptera because of a change in date from Upper Carboniferous to Lower Permian based on subsequent stratigraphic correlations.
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.
2001): Equatorial aridity in Western Pangea: Lower Permian loessite and dolomitic paleosols in Northeastern New Mexico, U.
Gilmoreichnus has been widely reported from the Lower Permian of southwestern North America: the Hermit Shale, Grand Canyon and the middle Earp Formation, Big Hatchet Mountains, New Mexico (Baird, in Zeller 1965) and from extensive collections from the Robledo Mountains of New Mexico (Haubold et al.
But all the Silurian, most of the Devonian and a major part of the Carboniferous and Lower Permian sequences are missing.