A bryozoan buildup from the Lower Carboniferous of North Wales
作者:
ADRIAN J. BANCROFT,
IAN D. SOMERVILLE,
ANGELA R. E. STRANK,
期刊:
Lethaia
(WILEY Available online 1988)
卷期:
Volume 21,
issue 1
页码: 51-65
ISSN:0024-1164
年代: 1988
DOI:10.1111/j.1502-3931.1988.tb01753.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
A carbonate buildup dominated by trepostome Bryozoa is described from Dinantian (Asbian) strata near Llandudno in North Wales. A three‐phase ecological succession is recognised within the buildup: (i) a basal diverse community with fenestrate, ramose, encrusting trepostome and cystoporate bryozoans in a mud rich wackestone; (ii) a bulk facies, dominated by encrusting and foliaceous, trepostome bryozoans in a fine packstone, and (iii) a thin capping phase, dominated by unilaminar, encrusting trepostome bryozoans in a slightly coarser lithology, including skeletal debris derived from the mound top and possible flanking beds. The buildup probably had topographic relief and developed in a shallow marine environment. The internal tripartite zonation reflects the growth of the structure into a shallower, higher energy regime, with the capping beds being deposited just below wave base. The buildup developed to the north of St. George's Land, on a carbonate shelf edge bordering the deeper basinal facies of the Irish Sea Basin.Dinantian, Asbian, buildup, trepostome Bryozoa, Foraminifera, corals, calcareous algae, Carboniferous, North Wale
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