The ammonoid genus Spiroceras (Spiroceratidae, Ammonoidea) from the Upper Bajocian of the Northern Caucasus
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DOI: 10.1134/s0031030117020101
Abstract: Ammonites of the genus Spiroceras are described from the Upper Bajocian of the Kyafar River Basin (Karachay-Cherkessia), including macroconchs with preserved apertures and (for the first time in the entire history of the study of… read more here.
Keywords: ammonoid genus; genus spiroceras; upper bajocian; spiroceratidae ammonoidea ... See more keywords
On the Dimorph Pair Strenoceras acre/Orthogarantiana humilis (Ammonoidea: Stephanoceratidae) from the Upper Bajocian of the Northern Caucasus
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DOI: 10.1134/s0031030120040103
Abstract: Some ammonites of the subfamily Garantianinae are revised based on the study of new collections from the lower part of the upper Subformation of the Djangura Formation (Upper Bajocian Strenoceras niortense Chronozone, Middle Jurassic) near… read more here.
Keywords: dimorph pair; strenoceras acre; humilis; upper bajocian ... See more keywords