...A. K. Miller ABSTRACT In this paper an attempt is made to summarize briefly the available data in regard to the Permian ammonoid zones represented in Soviet Russia, and to compare them with the familiar western Texas zones. It is pointed out that the Wolfcamp horizon (zone of Properrinites...

...Figure 7. Ammonoids from Permian and H. triviale–O. commune zones of East Greenland (all in natural size). (a, b) Hypophiceras minor (Spath), adult specimen, O. commune Zone, Aggersborg, northern Jameson Land (GGU 423887); (c) Hypophiceras triviale (Spath), imprint in shale, H. triviale...

...E. T. Tozer ABSTRACT The base of the Otoceras woodwardi Zone (stratotype in Himalayas) is accepted to define the base of the Triassic. Adoption of this convention is necessary because the Buntsandstein of Germany, the base of which provides the definition of the Permian-Triassic boundary...

... younger Permian ammonoid zone, that of Cyclolobus , is present in parts of the eastern hemisphere. The oldest definite Triassic fossils in Texas occur in the Dockum group, and are probably Upper Triassic in age, 10 but older Triassic fossils are present in the rocks of the Cordilleran province...

... have been established in this paper, and six of them are calibrated by ammonoids: Svalis-1 is dated by ammonoids of the late Griesbachian commune Zone. The assemblage is recovered from the Havert Formation overlying the Permian limestone. Svalis-2 is dated by ammonoids to the late Smithian tardus Zone...

... are tentatively recognized. The boundary between the Carboniferous and the Permian is drawn at the appearance of Yakutoproductus verchoyanicus , which does not correspond to the base of the Schwagerina zone. A westward shift of the boundaries of the boreal province occurred in the Permian. At the beginning...

... of ammonoid evolution through estimation of the duration of the Reitzi Zone and its subzones; (5) to assess the trajectory of biodiversity changes following the latest-Permian mass extinction. The Balaton Highland is a chain of rolling hills north of Lake Balaton and south of the Veszprém Plateau...

...-Continent cyclothems placed the black shales in shallow water, with maximum transgression at the fusulinid-bearing zone in the overlying limestone. The most recent model proposed that the black phosphatic shales, which commonly occur between two subtidal carbonates, are widespread and laterally continuous...

..., with scattered spicules and dis- seminated organic matter and pyrite . Lower Permian ammonoids (p . 65) occu r in nodules within this sequence, in association with brachiopods of Zone Et , which are also found at the top of section 116H-1A (Fig . 4, p . 160) . In sectio n 116H-1D (Fig. 4) the sub-Mesozoic...

...LAISHI ZHAO; YONGLIN CHEN; ZHONG-QIANG CHEN; LING CAO Abstract A complete marine uppermost Permian to Lower Triassic succession is well exposed at the Daxiakou section of the Three Gorges area, western Hubei Province, South China. A total of 12 conodont zones are recognized from the uppermost...

...Liao Zhuo-Ting Abstract Uppermost Permian (Changhsingian) brachiopods are abundant and diverse in South China; thus far, 60 genera and 130 species have been described from the Changhsing Formation. Two distinctive brachiopod faunas can readily be identified from a single Changhsingian zone...

... with the fusulinids might suggest the need for revision of existing concepts regarding the range of the Parafusulina rothi assemblage. 8 A. K. Miller, “Comparison of Permian Ammonoid Zones of Soviet Russia with Those of North America,” Bull. Amer. Assoc. Petrol. Geol ., Vol. 22 (1938), pp. 1017–18...

... Triassic ammonoid zones, starting with a late Otoceratan assemblage. Upper Permian and Lower Triassic strata contrast strikingly in diversity and abundance of fossils. Groups common in Permian strata but absent in Lower Triassic beds include sponges, bryozoans, productoids, seven bivalve superfamilies...

... authors. Compare especially Dunbar’s Fusuline zones and A. K. Miller’s Ammonoid zones (both for major subdivisions of the Carboniferous and Permian periods). All this is a far cry from the original Oppel zone which was clearly “a subdivision of a stage.” Discouraged by the existing confusion...

... of ammonoids (Glyptophiceras and Otoceras) and containing fragments of productids, bryozoans, and other fossils of “Permian” affinities. Southeast of Kap Stosch (e.g., between Rivers 6 and 14) the lowest Triassic strata encompassing the Glyptophiceras Zone are about 200 m thick. They are predominantly arkosic...

... integrated with the ammonoid and meager conodont data, is similar to that determined from successions in the Sverdrup Basin (Canada). The Permian-Triassic boundary post-dates a pronounced palynofloral turnover and predates a short duration reverse magnetozone (LT1n.1r). In the correlated Shangsi section...

... by the Lopingian (Late Permian) species associated with a few species persisting from the underlying Maokouan (Late Guadalupian). This fauna is of earliest Wuchiapingian in age as precisely constrained by the associated conodont Clarkina postbitteri postbitteri and the Guadalupian-type ammonoid fauna...