Results 171 to 180 of about 1,022 (197)
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The stratigraphy and petrochemistry of the Lough Nafooey Group (Tremadocian), western Ireland
Journal of the Geological Society, 1980The Lough Nafooey Group is divided into 4 formations. The lowermost Bencorragh Formation consists of spilitic pillowed tholeiites, passing up into the blocky andesite flows, breccias, cherts and basic pillow lavas of the Finny Formation. This is overlain by the Knock Kilbride Formation comprised of spilitized calc-alkali basic to intermediate lavas ...
P. D. Ryan, P. A. Floyd, J. B. Archer
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Tremadocian (Ordovician) biostratigraphy and graptolites at Dayangcha (Baishan, Jilin, NE China)
Palaontologische Zeitschrift, 2004Based on a systematic study of Tremadocian graptolites from the Early Ordovician Yehli Formation at Dayangcha, Baishan of Jilin, NE China, a revised graptolite zonation is proposed for the Tremadocian rocks in the area. In ascending order, the graptolite zones include theRhabdinopora flabelliformis parabola Zone, theAnisograptus matanensis Zone ...
Yuandong Zhang
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The Tremadocian Beds at Flagabro in South-Eastern Scania (Sweden)
Geologiska Föreningen i Stockholm Förhandlingar, 1958Abstract A drilling core from Flagabro offering a section through the entire Tremadocian of the locality is described. A report is added on the Ceratopyge Beds and the uppermost part of the Dictyonema Schales exposed at the rivulet cast of the Flagabro farmhouse. A section based on the core demonstrates that the Dictyonema Shales of the locality have a
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An unusual onychochilid mollusc from the Ordovician (Tremadocian) Fezouata Formation, Morocco
Geobios, 2015Pelecyogyra fezouataensis nov. gen., nov. sp. is described from the Lower Ordovician (Tremadocian, A. murrayi Biozone) Fezouata Formation at Oued Beni Zoli (locality Z-F5), in the central Anti-Atlas, Morocco. This is the first Onychochilidae Koken in Koken and Perner, 1925 reported from the Ordovician of Morocco.
Ebbestad, Jan Ove R., Lefebvre, Bertrand
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New Species of the Genus Vulcanisphaera (Acritarcha) from the Tremadocian of England
Micropaleontology, 1976Four new species of the genus Vulcanisphaera Deunff, 1961, are described from the Shineton Shales Formation, Tremadocian, England. The type species, V. africana Deunff, was previously recorded from the Tremadocian of Africa and Belgium. It is now recorded by the present author in the Tremadocian of England.
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Tremadocian Ceratopyge Limestone identified by means of conodonts, in Jämtland, Sweden
Geologiska Föreningen i Stockholm Förhandlingar, 1991Abstract A section through the autochthonous Ordovician limestone to the east of Brunfloviken, Jamtland, central Sweden, yielded conodonts from the upper Ceratopyge and Latorp limestones. The Tremadocian Ceratopyge Limestone is represented by a 5 cm thick bed with abundant phosphorite and glauconite.
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Early orthid brachiopods from the Tremadocian (Lower Ordovician) of northwestern Argentina
Journal of Paleontology, 2009Two brachiopod species of two of the earliest rhynchonelliformean families are described from one of the first studied Ordovician fossiliferous localities of northwestern Argentina. One is a new species of the family Euorthisinidae (Orthida, Plectorthoidea),Notorthisina musculosaVillas and Herrera.
Enrique Villas +2 more
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Sphenothallus (“Vermes”) from the Tremadocian Dumugol Formation, Korea
Journal of Paleontology, 1990Specimens of Sphenothallus ruedemanni (Kobayashi, 1934), which were originally assigned to Serpulites, are described from the Asaphellus Zone (Tremadocian) of the Dumugol Formation, Korea. Previously, Sphenothallus was known to occur in Middle Ordovician to Permian rocks, thus making Sphenothallus ruedemanni the earliest record of this genus.
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