Results 81 to 90 of about 1,613 (196)

A modern assessment of Ordovician chitinozoans from the Shelve and Caradoc areas, Shropshire, and their significance for correlation [PDF]

open access: yes, 2009
New chitinozoan data are presented from the classical section along the Onny River in the type Caradoc area, and from the deeper-water sections in the Shelve area, including the former British candidate GSSP for the base of the Upper Ordovician Series ...
Achab   +23 more
core   +2 more sources

The casa colorada formation at the Quebrada de Moya (cambrian-ordovician): contributions to the chronostratigraphy of a classical locality in the cordillera oriental of Jujuy (argentina) [PDF]

open access: yes, 2007
La Formación Casa Colorada constituye una potente secuencia silicoclástica aflorante en el sector medio de la quebrada de Humahuaca en la provincia de Jujuy.
Aceñolaza, Guillermo Federico   +2 more
core  

A spinose appendage fragment of a problematic arthropod from the Early Ordovician of Morocco [PDF]

open access: yes, 2006
A highly spinose fragment of a possibly raptorial appendage from the Arenig (Early Ordovician) of the Upper Fezouata Formation north of Zagora, southeastern Morocco is described as the arthropod Pseudoangustidontus duplospineus gen. et sp. nov.
Tetlie, Odd Erik, Van Roy, Peter
core   +1 more source

Global Series and Stages for the Ordovician System : a Progress Report [PDF]

open access: yes, 2005
There is no global standard set of chronostratigraphic/geochronologic subdivisions for the Ordovician System/Period. British series/epochs are often used as de facto nomenclature on stratigraphic correlation charts and geologic time scales. However, they
Finney, S.
core   +3 more sources

An Early Ordovician (Floian) Conodont Fauna from the Eastern Cordillera of Peru (Central Andean Basin) [PDF]

open access: yes, 2008
Late Floian conodonts are recorded from a thin limestone lens intercalated in the lower part of the San José Formation at the Carcel Puncco section (Inambari River), Eastern Cordillera of Peru.
Albanesi, G. L.,   +4 more
core   +2 more sources

PALYNOLOGICAL STUDY OF PALEOZOIC SEDIMENTS OF THE CHAL-I-SHEH AREA, SOUTHWESTERN IRAN [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 1993
The Paleozoic sediments of the Chal-i-Sheh area in southwestern Iran comprising of Mila Formation, Ilebek Formation and Faraghan Formation, were studied palynologically. The samples containing well-preserved palynomorphs include acritarchs, chitinozoans,
doaj  

Storm deposits of the Coquena Formation (Upper Tremadocian) at the Chalala creek, Cordillera Oriental [PDF]

open access: yes, 2013
En la quebrada de Chalala aflora una sucesión heterolítica dominantemente arenosa caracterizada por abundantes niveles bioclásticos, que ha sido asignada a la Formación Coquena (Tremadociano superior).
Benítez, María del Huerto
core   +1 more source

NEW GEOLOGICAL AND STRATIGRAPHICAL DATA AND DISCOVERY OF LOWER ORDOVICIAN ACRITARCHS IN THE SAN VITO SANDSTONE OF THE GENN'ARGIOLAS UNIT (SARRABUS, SOUTHEASTERN SARDINIA)

open access: yesRivista Italiana di Paleontologia e Stratigrafia, 2020
The subject of this paper is new geological and stratigraphical data regarding the Paleozoic in the Sarrabus area (Southeastern Sardinia). More particularly Tremadocian (Lower Ordovician) acritarchs have been found in samples taken for microfossils ...
SEBASTIANO BARCA   +2 more
doaj  

PYRITE VARIETIES IN ESTONIAN TREMADOCIAN ARGILLITE (DICTYONEMA SHALE) [PDF]

open access: yesProceedings of the Estonian Academy of Sciences. Geology, 1992
Toivo Kallaste, Eduard Pukkonen
openaire   +1 more source

Acritarches du Cambro-Ordovicien du massif du Brabant, Belgique [PDF]

open access: yes, 1975
The outcrops of the « Quartzophyllades de Chevlipont » and the« Quartzophyllades de Villers-la-Ville » in both the Dyle and Thylevalleys, in the Province of Brabant, contain acritarch assemblages ofsixty-eight species and two subspecies.
Martin, F.
core  

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