NDLI: Hydrozoan build-ups ofMillepora irregularis sp. nov. and fungiid coral meadows ofCunnolites Alloiteau (Anthozoa)—Palaeoecological and palaeoceanographical implications for the upper cretaceous of North Cantabria (Northern Spain)

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Hydrozoan build-ups ofMillepora irregularis sp. nov. and fungiid coral meadows ofCunnolites Alloiteau (Anthozoa)—Palaeoecological and palaeoceanographical implications for the upper cretaceous of North Cantabria (Northern Spain)

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Facies : Volume 38

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Hydrozoan build-ups ofMillepora irregularis sp. nov. and fungiid coral meadows ofCunnolites Alloiteau (Anthozoa)—Palaeoecological and palaeoceanographical implications for the upper cretaceous of North Cantabria (Northern Spain)

Content Provider	Springer Nature Link
Author	Rehfeld, Ursula Ernst, Gundolf
Copyright Year	1998
Abstract	The Cantabrian Basin of northern Spain yields an Upper Santonian/Lower Campanian carbonate sequence, where both milleporid hydrozoans and fungiid corals established uncommon and hitherto unknown bioconstructions. The section where these bioconstructions are exposed can be divided in four lithological units.The hydrocoralline bioconstructions are developed as biostromes inunit one and as bioherms inunit three. Biostromes and bioherms are separated byunit two, a carbonate facies rich in “lithistid” and hexactinellid sponges.The hydrozoan colonies were preserved due to early diagenetic silicification of their formerly aragonitic skeleton. The examined fauna strongly resembles the Recent milleporid taxonMillepora alcicornis. Significant differences between fossil and Recent skeletal structures can be recognised only in the distribution of zooecial tubes within the coenosteum.The hydrozoan facies is topped byunit four, a quartz-rich limestone, with at least a dozen bed surfaces, each covered by dense meadows of a more or less monospecific fungiid coral fauna, assigned to the genusCunnolites Alloiteau.The milleporids developed in, at least intermittently agitated, shallow water environment with normal, open marine salinities. The sediment yields a microfacies rich in benthic foraminifera and bioclasts and poor in terrestrial components. TheCunnolites fauna, instead, probably spread in a quiet, more restricted environment of a deeper lagoonal facies, poor in marine biogenes, except for some rare associated gryphaeid oysters and irregular echinoids. This facies is conspicuously influenced by terrigenic input, as is substantiated by abundant quartz minerals, wood fragments and small coal flakes.The conspicuous environmental change from the hydrozoan into the fungiid coral facies matches an approach of the coastline, obviously related to an Upper Santonian/Lower Campanian “tecto-event”, which has been proved on a superregional scale.Both the milleporid hydrozoans and the fungiid corals point to a temporary influx of subtropical Tethyan ocean waters in the Boreal Realm of the Biskaya Ocean during this time.
Starting Page	125
Ending Page	138
Page Count	14
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	39
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrozoan Build-ups Fungiid Meadows Palaeoceanography Palaeoecology Northern Spain Cretaceous (Late Santonian/Early Campanian) Biogeosciences Geochemistry Paleontology Sedimentology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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Hydrozoan build-ups ofMillepora irregularis sp. nov. and fungiid coral meadows ofCunnolites Alloiteau (Anthozoa)—Palaeoecological and palaeoceanographical implications for the upper cretaceous of North Cantabria (Northern Spain)