A graptolite-rich Ordovician-Silurian boundary section in the south-central Pyrenees, Spain: stratigraphical and palaeobiogeographical significance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F19%3A00505046" target="_blank" >RIV/67985831:_____/19:00505046 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/geological-magazine/article/graptoliterich-ordoviciansilurian-boundary-section-in-the-southcentral-pyrenees-spain-stratigraphical-and-palaeobiogeographical-significance/33F3604EAF424E10CE9524DA56AEE217" target="_blank" >https://www.cambridge.org/core/journals/geological-magazine/article/graptoliterich-ordoviciansilurian-boundary-section-in-the-southcentral-pyrenees-spain-stratigraphical-and-palaeobiogeographical-significance/33F3604EAF424E10CE9524DA56AEE217</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/S001675681800047X" target="_blank" >10.1017/S001675681800047X</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A graptolite-rich Ordovician-Silurian boundary section in the south-central Pyrenees, Spain: stratigraphical and palaeobiogeographical significance

Popis výsledku v původním jazyce

An Ordovician-Silurian boundary section marked by an uninterrupted, relatively high rate of black shale sedimentation and abundant, diverse graptolites is described from the south-central Pyrenees. The structurally simple Estana section comprises the uppermost part of the quartzite-dominated Bar Formation and overlying black shales of late Hirnantian and early Rhuddanian age, which have been dated by graptolites to the upper Metabolograptus. persculptus and lower-middle Akidograptus ascensus-Parakidograptus acuminatus biozones. Due to the absence of M. persculptus, a Metabolograptus parvulus Biozone correlative with the upper part of the persculptus Biozone is recognized below the lowest occurrence of akidograptids, which indicate the base of the Silurian System. The graptolite fauna comprise 27 species including Normalograptus minor, N. lubricus, N. rhizinus, Hirsutograptus, Korenograptus bifurcus, K. bicaudatus, K. lanpherei and Nd. shanchongensis, most of which were formerly considered to be endemic to the low-latitude palaeobiogeographical province of China, Siberia and northern North America. Two new species, N. baridaensis and N. ednae, are described. The succession of graptolite assemblages in the Estana section, and occurrence of several cosmopolitan taxa in its parvulus and lower ascensus-acuminatus biozones that are unknown elsewhere in peri-Gondwanan Europe, suggest that strata immediately surrounding the Ordovician-Silurian boundary may be absent, highly condensed or oxic and barren of graptolites in other sections of northwestern peri-Gondwana. Common graptolite synrhabdosomes and abnormal rhabdosomes may indicate some environmental stress in the parvulus Biozone, although the rather uniform black shale lithology, total organic carbon content and δ13 Corg values suggest uninterrupted sedimentation under stable, anoxic conditions.

Název v anglickém jazyce

A graptolite-rich Ordovician-Silurian boundary section in the south-central Pyrenees, Spain: stratigraphical and palaeobiogeographical significance

Popis výsledku anglicky

An Ordovician-Silurian boundary section marked by an uninterrupted, relatively high rate of black shale sedimentation and abundant, diverse graptolites is described from the south-central Pyrenees. The structurally simple Estana section comprises the uppermost part of the quartzite-dominated Bar Formation and overlying black shales of late Hirnantian and early Rhuddanian age, which have been dated by graptolites to the upper Metabolograptus. persculptus and lower-middle Akidograptus ascensus-Parakidograptus acuminatus biozones. Due to the absence of M. persculptus, a Metabolograptus parvulus Biozone correlative with the upper part of the persculptus Biozone is recognized below the lowest occurrence of akidograptids, which indicate the base of the Silurian System. The graptolite fauna comprise 27 species including Normalograptus minor, N. lubricus, N. rhizinus, Hirsutograptus, Korenograptus bifurcus, K. bicaudatus, K. lanpherei and Nd. shanchongensis, most of which were formerly considered to be endemic to the low-latitude palaeobiogeographical province of China, Siberia and northern North America. Two new species, N. baridaensis and N. ednae, are described. The succession of graptolite assemblages in the Estana section, and occurrence of several cosmopolitan taxa in its parvulus and lower ascensus-acuminatus biozones that are unknown elsewhere in peri-Gondwanan Europe, suggest that strata immediately surrounding the Ordovician-Silurian boundary may be absent, highly condensed or oxic and barren of graptolites in other sections of northwestern peri-Gondwana. Common graptolite synrhabdosomes and abnormal rhabdosomes may indicate some environmental stress in the parvulus Biozone, although the rather uniform black shale lithology, total organic carbon content and δ13 Corg values suggest uninterrupted sedimentation under stable, anoxic conditions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10506 - Paleontology

Projekt

<a href="/cs/project/GA14-16124S" target="_blank" >GA14-16124S: Zpřesnění chronostratigrafie spodního siluru: návrh nových mezinárodních stratotypů (GSSP) stupňů aeron a homer</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geological Magazine

ISSN

0016-7568

e-ISSN

—

Svazek periodika

156

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

1069-1091

Kód UT WoS článku

000466534300008

EID výsledku v databázi Scopus

2-s2.0-85049299871