... ). The A. kolymensis Local Zone is conformably overlain by stratigraphic equivalents of the upper part of the lower Carnian of north-eastern Russia, which is confirmed by the occurrence of ammonoids A. cf. okhotensis in the upper part of the bed 3 (interval 3.0–6.8 m). In northeastern Russia, first occurrences...

.... Perrinitids are usually thought to be provincial ammonoids. They are known to occur in abundance at only a few localities around the world and are entirely absent from some classic, highly diverse Permian ammonoid localities, such as the Urals in Russia and Kazakhstan. Nevertheless, they have figured...

... is 3–10 m in the Olenek Bay sections (at Ulakhan-Krest and Ystannakh-Khocho settlements) and in the Olenek Channel of the Lena Delta (Taas-Krest Creek) ( Fig. 5 ). Here, the formation lithologies yield the ammonoids Arctophyllites cf. taimyrensis (Popow); nautiloids Cenoceras boreale (Dagys et...

.... Krestovnikovi foraminifera zone ( Koren’, 2006 ) in many geological provinces of Russia: Timan-Pechora, Northern and Polar Urals, Eastern Urals, and Novaya Zemlya. The zone Arch. krestovnikovi corresponds to the lower half of the Upper Visean (if the stages are divided into two substages of upper/lower). Since...

... ammonoids and is separated from underlying Permian strata by an unconformity. The three Permian Formations are: 1) Kutan Formation— basal conglomerate and sandstone with some interbeds of limestone in the upper part; 2) Nikitin Formation—platy algal limestone with abundant foraminifers; and 3) Urushten...

... disappearance of rufloriacean flora, that may persisted in the nearshore zones of the brackish-water basins of the Verkhoyansk region up to the end of the Permian ( Budnikov et al., 2002 ). biostratigraphy bivalves carbon isotopes upper Permian Permian-Triassic boundary South Verkhoyansk region...

..., and Aqqan. Parapronorites cf. rectus Leonova, 1989 (NIGP 104551) The major section yielding Metaperrinites Ruzhencev, 1950 in the Kalpin area is at Kunkraqi, Akqi County, where the Lower Permian ammonoids were described respectively from three separate beds within a 350 m interval...

.... In the upper part, Pennines (England) chronostratigraphy, foraminiferal zones (1–14; Cózar & Somerville, 2021 a ) and their correlations with the ammonoid zones in shallow-water platforms of England (B2 to E2c) are included. In the lower part, the Urals chronostratigraphy is compared...

... marine sedi- mentation immediately before the deposition of the Lower Griesbachia n sediments . A record may have been made in the ocean basins but wa s presumably long ago swept into a subduction zone where its identity ha s been lost forever. PERMIAN FORMATIONS OF NORTHEAST U .S.S .R. V . I . USTRITSKY...

... one new species, Mullericeras gujiaoense n. sp. The new data show that a relatively high level of ammonoid taxonomic richness occurred rather rapidly after the Permian/Triassic mass extinction in the late Griesbachian, echoing similar observations in other basins, such as in the Northern Indian Margin...

... were proposed for the Upper Triassic Stage of the Lena-Khatanga and New Siberian Islands structure-facies zones ( Yadrenkin, 1991 , 1994 ). Fig. 3. Comparison of Olenekian, Anisian, Ladinian, and Carnian zonal scales of northeastern Russia, constructed based on ammonoids, nautiloids...

... 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...

... Virgilian = lower Gzhelian). This interval corresponds to parts or all of the Wellerites through Shumardites ammonoid Zones of Boardman et al. (1994a) and the Idiognathodus delicatus through Streptognathodus virgilicus conodont Zones of Barrick et al. (2004) and represents a considerable...

... chart showing biostratigraphic units recognized in the Upper Paleozoic of Patagonia The Sueroceras irregulare Zone is characterized by the index species Sueroceras irregulare Riccardi and Sabattini, 1975 and includes S .? chubutense ( Closs, 1967 ), S .? cf. S. chubutense ( Closs, 1967...

...) , or to the Lundbladispora obsoleta – Chordecystia chalasta zone of Mangerud (1994) . Thus, the studied interval section covers an important hiatus between the Late Permian and the Griesbachian (cf. Fig. 2 ). Except for the disappearance of one group ( Vittatina ) and the appearance of the Aratrisporites group...

.... The zone of Pseudoschwagerina and Properrinites should be recognized as comprising the lowest part of the Permian system. —This zone was not incorporated in the original definition of the Permian of Russia, but its inclusion accords with a growing modern usage founded on studies in Europe, Asia, North...

... River Group) of North-Central Texas. Although regarded originally as Guadalupian, these deposits have been assigned recently to the Early Permian on the basis of marine fossils and questionable lithostratigraphic correlations between marine and continental strata. A review of ammonoid genera recovered...

... possible relationship to major climate-change events at the Permo-Triassic boundary are discussed in following sections. The claim that the Vyazniki beds include some of the youngest Permian horizons in Russia, and that the Vyazniki and Zhukov sections straddle the Permo-Triassic boundary...

...., 2015 ). Ammonoids are less abundant in the next overlying beds that yield Xenoceltites subevolutus and Pseudosageceras augustum . PIMUZ A/I 4397 was found in situ in these latest Smithian P . augustum beds (layer PLR 35, Unitary Association Zone 6 of Jattiot et al., in press) in Section 2 (N40...

... in remote correlations. Findings of brachiopods and ammonoids outline beds with fauna and zones through which a correlation is performed within the Verkhoyansk-Okhotsk district ( Figs. 2 and 3 ). Fig. 2. Regional stratigraphic subdivisions of the Carboniferous of the Verkhoyansk-Okhotsk region...