Gutiérrez-Marco, Juan Carlos

Hunter, Aaron

Lefebvre, Bertrand

Nardin, Elise

Nohejlová, Martina

Sumrall, Colin D.

Zamora, Samuel

Trabajo presentado en el 5th International Palaeontological Congress, celebrado en París (Francia) del 9 al 13 de julio de 2018In recent years, the Upper Ordovician series of the Tafilalt area (eastern Anti-Atlas, Morocco) have
yielded several echinoderm Lagerstätten (or ’starfish beds’) providing a relatively continuous record of
successive, nearshore, echinoderm-dominated assemblages from the early Sandbian to the Hirnantian.
During this time interval, the composition of the Tafilalt echinoderm assemblages shows little change, with
the persistence of the same dominating groups: edrioasteroids, eocrinoids, glyptocystitid rhombiferans,
ophiuroids, solutans and stylophorans. Asteroids, coronates, crinoids and diploporitans are also present,
though generally as minor components of these assemblages. From a palaeobiogeographic point of view,
the Tafilalt assemblages share many similarities with Sandbian to early Katian faunas described in other
high-latitude (peri)Gondwanan regions of the Mediterranean Province (e.g. Armorican Massif, Bohemia,
Spain). During the late Katian time interval, typical ’cool-adapted’ Mediterranean echinoderm assemblages
are suddenly replaced, in most peri-Gondwanan areas (e.g. Algeria, Aragón, Armorican Massif, Cantabria,
Carnic Alps, Corbières, Montagne Noire, Portugal, Sardinia), by more ’temperate’ faunas, migrating
southward from lower palaeolatitudes, and dominated by coronates, crinoids, and both caryocystitid and
hemicosmitid rhombiferans. No such dramatic faunal turnover (’Boda Event’) is documented in the Tafilalt
area during the late Katian time interval, probably because of its palaeogeographic position at higher
palaeolatitudes.Peer reviewe

Gutiérrez-Marco, J. C.

Hunter, Aaron W.

Zamora Iranzo, Samuel Andrés

Digital.CSIC

Palaeobiogeographic implications of exceptionally preserved Late Ordovician echinoderm assemblages from the Tafilalt area, Morocco

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Palaeobiogeographic implications of exceptionally preserved Late Ordovician echinoderm assemblages from the Tafilalt area, Morocco

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Digital.CSIC

Archive Ouverte en Sciences de l'Information et de la Communication

HAL-ENS-LYON

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