2016
DOI: 10.1017/s1755691017000068
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Late Ordovician trilobites from the Mayatas Formation, Atansor area, north-central Kazakhstan

Abstract: Two trilobite faunas of Late Ordovician (Katian) age are described from the Mayatas Formation in the Stepnyak region of north-central Kazakhstan. The older, oligotaxic fauna derives from flanks of a carbonate build-up, and is dominated by numerous Sphaerexochus specimens. Amphilichas is also relatively common, with Pliomerina and indeterminate asaphids present as rare components. The overlying unit of siliceous argillites contains a different assemblage, representing the raphiophorid biofacies and comprising s… Show more

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Cited by 4 publications
(16 citation statements)
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“…The specimens from the Ak‐Kerme Peninsula show the closest similarity to, and are probably congeneric with, cranidia described by McCobb & Popov (2017) as Malongullia ? sp.…”
Section: Methodsmentioning
confidence: 61%
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“…The specimens from the Ak‐Kerme Peninsula show the closest similarity to, and are probably congeneric with, cranidia described by McCobb & Popov (2017) as Malongullia ? sp.…”
Section: Methodsmentioning
confidence: 61%
“…1). Additional material conditionally assigned to the same species by McCobb & Popov (2017) from the Mayatas Formation (presumably lower Katian) of the Stepnyak Region of north‐central Kazakhstan, is also inadequately preserved but described in detail and better illustrated. In general, given the morphology and proportions of the cranidium and glabella, and the subtriangular fixigenae with strongly bent palpebral lobes at the anterolateral corners, the specimens from the Kopkurgan Formation are very similar and most probably conspecific.…”
Section: Systematic Palaeontologymentioning
confidence: 99%
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