Surface Sculpture of the Wall in Lower Paleozoic Acritarchs

Tappan, Helen; Leoblich, Alfred R.

doi:10.2307/1484870

Cited by 69 publications

(18 citation statements)

References 1 publication

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“…(6) Samples MG10008 and MG10009 contain a low diversity acritarch association that comprises a few transitional taxa, including Acanthodiacrodium vavrdovae, Tappan & Loeblich, 1971 (Fig. 8E).…”

Section: Acritarchsmentioning

confidence: 99%

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Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

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The Lower-Middle Ordovician sediments exposed in the Faraghan Mountains, south-eastern Zagros Ranges, represent a condensed succession of siliciclastic-dominated rocks rich in palynomorph assemblages (acritarchs and subsidiary chitinozoans) and sparse shelly concentrations bearing biostratigraphically significant brachiopods and conodonts. The Lower Ordovician Zard-Kuh Formation comprises coarse-grained siliciclastic deposits rich in Cruziana ichnofossils. The lower 80 m of the overlying Seyahou Formation, late Floian to Katian in age, form a heterolithic succession composed of black and green shales, subarkoses and silty limestones. Its lower part is punctuated by a centimetric phosphoarenite that contains lingulate brachiopods (Atansoria yaseri sp. nov.) and conodonts (Baltoniodus aff. B. triangularis Lindström and Drepanoistodus sp.) that suggest a latest Floian age. The top of the condensed phosphoarenite is marked by a considerable hiatus that ranges the Dapingian and early Darriwilian interval. Overlying the hiatus, the Seyahou Formation comprises two fossiliferous levels, the oldest dated as mid-Darriwilian with chitinozoans characteristic of the Siphonochitina formosa Zone, and the youngest of the Katian Acanthochitina barbata Zone. Mid Ordovician phosphogenesis associated with starvation, reworking, resedimentation, and the onset of distinct stratigraphic gaps was a complex process recorded throughout the Arabian margin of Gondwana. In the Zagros Ranges, maximum flooding and phosphate precipitation are suggested as the counterpart of the Helskjer Drowning Event of Baltoscandia and the third-order maximum flooding surface that punctuates the Siphonochitina formosa Zone in North Africa.•

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Section: Acritarchsmentioning

confidence: 99%

“…• E -Ordovicidium elegantulum Tappan & Loeblich, 1971, NIOC/MG10009/IOOC/ slide 1, sample MG10009. • F -Villosacapsula setosapellicula (Loeblich, 1970) Loeblich & Tappan, 1976 posterior extension of the base and rudimentary denticles on the upper anterior margin.…”

Section: Baltoniodus Aff B Triangularis Lindström 1955mentioning

confidence: 99%

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

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“…Because original diagnoses are traditionally based on transmitted light, our identifications are, consequently, subject to some uncertainties. On the other hand, minute surface features, which are much better resolved by SEM, are often considered taxonomically significant (Tappan & Loeblich 1971).…”

Section: Methodsmentioning

confidence: 99%

Palynological data from sediments of the Hunsruckschiefer type, Lower Devonian of the SW Hunsruck, Germany

Brocke¹,

Kneidl²,

Wilde³

et al. 2017

Bull. Geosci.

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“…Dactylofusa fastidiona (Cramer) Combaz et al and Rhachosoarium lappaceum Tappan & Loeblich from the Late Ordovician of the USA are similar in shape, but differ in an absence of bifurcate spines (Tappan & Loeblich 1971). Holothuriadeigma heterakainum Cramer differ in stouter, longer sculptural elements.…”

Section: Palynologymentioning

confidence: 96%

Middle Devonian palynomorphs from southern Moravia: an evidence of rapid change from terrestrial deltaic plain to carbonate platform conditions

Vavrdová¹,

Dašková²

2011

Geologica Carpathica

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Dispersed fossil miospores and acritarchs have been recovered from the subsurface pelites in the Uhřice-1 borehole, southern Moravia. Spores of ferns, sphenopsids and lycopods with rare marine microplankton (acritarchs and chitinozoans) cysts indicate a predominantly continental environment with a limited marine influence. Dispersed miospores with cysts of unicellular marine microplankton confirm the Middle Devonian, most probably early Givetian (AD lem) age of marine transgression in southern Moravia. Thermal alteration of palynomorphs shows average values, with TAI ranging from 2+ to 3+, corresponding to 60-70 °C.

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Surface Sculpture of the Wall in Lower Paleozoic Acritarchs

Cited by 69 publications

References 1 publication

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Palynological data from sediments of the Hunsruckschiefer type, Lower Devonian of the SW Hunsruck, Germany

Middle Devonian palynomorphs from southern Moravia: an evidence of rapid change from terrestrial deltaic plain to carbonate platform conditions

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