| 释义 |
Sakmarian, a. Geol.|sækˈmærɪən|
[ad. Russ. Sakmarskiĭ (first used as a stratigraphical term by A. Karpinsky 1874, in Zap. Imperatorskago Min. Obshchestva IX. 269), f. Sakmara, name of a river in the Southern Urals: see -ian.]
Name of a stage in the Lower Permian in the Soviet Union; of or pertaining to this stage and the rocks that characterize it, and the geological age during which they were deposited. Freq. absol.
1936V. E. Ruzhentsev in Problemȳ Sovetskoï Geologii VI. 506 The upper Carboniferous is overlain in complete conformity by the Permian system which begins with Schwagerina beds. The writer defines by the name Sakmarian the whole of the deposits with Schwagerina princeps Ehr. and with the Ammonoid fauna described for the first time from the Sakmara river... The Sakmarian consists of sandy-argillaceous beds among which there are many conglomerates. 1960Bull. Geol. Soc. Amer. LXXI. 1766/2 It is now the official usage of the Geological Survey of the U.S.S.R. to draw the base of the Permian below the Sakmarian and equivalent beds in the Ufa Plateau. 1963D. W. & E. E. Humphries tr. Termier's Erosion & Sedimentation i. 20 Lakes and marshes are known in the northern hemisphere which were contemporaneous with the Stephanian and Sakmarian glaciers of the Southern hemisphere. 1974Nature 8 Feb. 396/1 McLachlan and Anderson have recorded orthocerid nautiloids, the brachiopod Attenuatella, [etc.]..from the base of the succession near Kimberley. They favoured a Sakmarian age for this marine incursion. |