acritarch


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acritarch

[′ak·rə‚tark]
(paleontology)
A unicellular microfossil of unknown or uncertain biological origin that occurs abundantly in strata from the Precambrian and Paleozoic.
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This acritarch assemblage was termed 'the Kybartai assemblage' by Jankauskas (2002) and corresponds to assemblage 3 by Hagenfeldt & Bjerkeus (1991).
Ediacaran and Cambrian stratigraphy in Estonia: an updated review/Ediacara ja Kambriumi stratigrafia Eestis: ajakohastatud ulevaade
Acritarch and trace fossils in this unit indicate late Tremadocian age (White et al.
Stratigraphy, provenance, and tectonic setting of the Lumsden Dam and Bluestone Quarry formations (Lower Ordovician), Halifax Group, Nova Scotia, Canada
In these measurements acritarch CAI values were used.
Estonian graptolitic argillites--ancient ores or future fuels?
He and other paleontologists have suspected for some time that a fraction of the known acritarch species represent predecessors of modern dinoflagellates.
Arctic fossils record evolutionary burst
In addition to the index taxon, Asteridium tornatum (Volkova), the Lontova acritarch assemblage of the East European Craton is characterized by the occurrence of Granomarginata squamacea Volkova, G.
Early Cambrian tubular fossils of the genus Onuphionella from Estonia/Perekonna Onuphionella torujad kivistised Eesti Alam-Kambriumist
0 m provided comparatively rich and diverse acritarch assemblages.
Discovery of the messaoudensis-trifidum acritarch assemblage (upper Tremadocian-lower Floian, Lower Ordovician) in the subsurface of Morocco
The outcrops also contain undescribed pre-Agnostus pisiformis acritarch assemblages that confirm the timing of their deposition to the Cambrian Epoch 3 (Palacios et al.
Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures
These strata contain the Lontova acritarch assemblage and a low-diversity small shelly fauna characteristic of the Platysolenites antiquissimus Zone (e.
Trace fossils Didymaulichnus cf. tirasensis and Monomorphichnus isp. from the Estonian Lower Cambrian, with a discussion on the early Cambrian ichnocoenoses of Baltica/Ihniidid Didymaulichnus cf. tirasensis ja Monomorphichnus isp. Eesti alamkambriumis ja Baltika urgmandri varakambriumi voimalik Ihnokooslus
Nevertheless, at least four distinctive acritarch assemblages can be recognized, providing particular taxonomic characteristics of the studied strata.
New data on acritarchs from the Upper Ordovician of the Tungus basin, Siberian Platform
Early Tremadoc acritarch microfossils were reported by Doyle (1979) and confirmed by Palacios et al.
Stratigraphy of the Lower Paleozoic Goldenville and Halifax groups in southwestern Nova Scotia
The age of the Kotlin sandstone is rather loosely constrained (< 570 Ma), whereas the Lontova Formation is represented by the sub-trilobitic acritarch assemblage of Asteridium tornatum-C.
Provenance shift in Cambrian mid-Baltica: detrital zircon chronology of Ediacaran-Cambrian sandstones in Estonia
and the acritarch assemblage found from two levels in the Maekalda section near the centre of Tallinn (15 km west of the Ulgase section) allow tentative correlation of the Ulgase Formation in Tallinn and its environs with the Olenus trilobite Biozone (Mens et al.
Phosphatized organic nanostructures in the Cambrian Linguloid brachiopod Ungula inornata (Mickwitz)/Fosfatiseerunud orgaanilised nanostruktuurid Kambriumi brahhiopoodil Ungula inornata (Mickwitz)

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