PLEISTOCENE ROLLING STONES OR LARGE BRYOZOAN NODULES IN A MIXED SILICICLASTIC-CARBONATE ENVIRONMENT (RHODES, GREECE)

Spectacular accumulations of abundant bryozoan nodules (bryoliths) occur in the early Pleistocene coarse-grained, mixed carbonate-siliciclastic deposits of the Cape Arkhangelos Calcarenite of Rhodes, Greece. These bryoliths are always associated with numerous bivalves (mostly ostreids and pectinids)...

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Veröffentlicht in:Palaios 2010-01, Vol.25 (1), p.24-39
Hauptverfasser: MOISSETTE, PIERRE, CORNÉE, JEAN-JACQUES, KOSKERIDOU, EFTERPI
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description Spectacular accumulations of abundant bryozoan nodules (bryoliths) occur in the early Pleistocene coarse-grained, mixed carbonate-siliciclastic deposits of the Cape Arkhangelos Calcarenite of Rhodes, Greece. These bryoliths are always associated with numerous bivalves (mostly ostreids and pectinids) and serpulid worms, together with other rarer skeletal organisms. The spheroidal bryoliths vary in diameter from 1 cm to 16 cm, and those with a more ellipsoidal shape range from 0.8 cm to 22 cm in length and from 0.7 cm to 16 cm in width; an elongated bryolith of exceptional size (40 cm) was even found. The bryoliths are composed almost exclusively of the anascan cheilostome Calpensia nobilis and are nucleated on gravels, pebbles, or bivalve shells. After settlement of bryozoan crusts, the bryoliths increased in size by repeated overturning of these mobile hard substrates by longshore currents. The bryoliths developed at depths of 20–40 m on a flat shoal between emerged areas where bottom currents episodically accelerated during storms. The currents also transported the bryoliths, together with other skeletal elements, into deeper settings (40–80 m) where they could continue their growth, upward or downward, or be colonized by other organisms.
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source Jstor Complete Legacy; BioOne Complete
subjects Aegean Islands
Algae
Bivalvia
Bryozoa
Calpensia nobilis
Cape Arkhangelos Calcarenite
Carbonates
Cenozoic
Cheilostomata
coastal environment
concretions
Continental interfaces, environment
Dodecanese
Environmental Sciences
Europe
faunal list
Fossils
Geology
Global Changes
Gravel
Greece
Greek Aegean Islands
Invertebrata
lithostratigraphy
Livada Plateau
lower Pleistocene
Mediterranean region
Mollusca
Nodules
Outcrops
Paleoecology
paleoenvironment
Pebbles
Pleistocene
Polychaetia
Quaternary
Quaternary geology
Rhodes
Sciences of the Universe
secondary structures
sedimentary structures
Sediments
Serpulidae
Southern Europe
subtidal environment
Vermes
title PLEISTOCENE ROLLING STONES OR LARGE BRYOZOAN NODULES IN A MIXED SILICICLASTIC-CARBONATE ENVIRONMENT (RHODES, GREECE)
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