Die ökologische Bedeutung der Hartgründe („Hardgrounds”) in der oberen Kreide

Voigt, Ehrhard

doi:10.1007/bf02987371

Cited by 38 publications

(7 citation statements)

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“…Principal examples include the Silurian of Indiana (Halleck 1973); the Devonian of Iowa (Koch & Strimple 1968) and Russia (Hecker 1935(Hecker , 1960(Hecker , 1965; the Jurassic of England (Palmer & Fursich 1974;Fursich & Palmer 1975), France (Purser 1969;Fursich 1971). and Poland (Kaimierczak & Pszczolkowski 1969); and the Cretaceous of most of north-west Europe (Voigt 1959;Bromley 1967Bromley , 1975, South Africa (Kennedy & Klinger 1972) and Texas (Perkins 1971).…”

mentioning

confidence: 99%

Faunal distribution and colonization strategy in a Middle Ordovician hardground community

Palmer

Palmer²

1977

LET

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The attached fauna of one of the many hardgrounds from the Galena Group (Trentonian Substage) of the Upper Mississippi Valley is described. The fauna is composed of three principal elements, viz. (1) borers, including Cicatricula retiformis ichnogen. et ichnosp. nov., (2) pelmatozoans with encrusting holdfasts, and (3) bryozoans. Analysis of the distribution of members of each population on the hardground shows that most are strongly aggregated. The nature of, and reasons for, such aggregations are considered in the light of comparable Recent shallow‐water marine populations. The community on this hardground, and those on other Galena Group hardgrounds, are immature. This is a consequence of frequent and damaging scour, which these organisms were poorly adapted to resist.

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confidence: 99%

Faunal distribution and colonization strategy in a Middle Ordovician hardground community

Palmer

Palmer²

1977

LET

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“…The fistulose species from European localities are found mainly in bryozoan sediments and from hardground cavities or Thalassinoides burrows near Maastricht and Stevns Klint. In these burrow lumen, the preservation of fragile smaller fossils, especially of delicate bryozoans, is extremely good because they were sheltered from wave action and currents (Voigt 1959). Bryozoa occurring in these deposits represent various zoarial groups; they form erect branching or lamellar flat-creeping colonies.…”

Section: Fistulose Foraminifera As Epibionts On Bryozoan Coloniesmentioning

confidence: 99%

Bryozoans as substratum of fossil fistulose Foraminifera (Fam. Polymorphinidae)

Pożaryska

Voigt

1985

LET

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Ehrhard 198504 15: Bryozoans as substratum of fossil fistulose Foraminifera (Fam. Polymorphinidae). Lethaia, Vol. 18, pp. 155-165. Oslo. ISSN 0024-1164.In the Upper Cretaceous-Lower Tertiary sections exposed in the Curfs quarries at Berg (munic. Berg en Terblijtalso known as Geulhem, southern Netherlands) and some other localities, numerous foraminifers of the family Polymorphinidae with complete fistulose apertures have been found. These apertures, which are equipped with circular openings and auxiliary apertural chambers, branching and numerous narrow projecting tubes or stolons, have been widely reported, but their role has been the subject of controversy. The Dutch material shows the foraminifers attached with the apertural tubes to fragments of bryozoan colonies or molluscan shells, suggesting that the tubes could perhaps act as holdfast organs. Most specimens were found in calcarenites of the nearshore facies. The foraminifers cannot be treated as symbiotic organisms nor parasites but as epifauna in search of protection from mechanical destruction by waves and current action. The present case may be best explained as an adaptation of sessile foraminifers with fragile hyaline tests to live in highly disadvantageous, high-energy conditions. 0 Foraminifera, Polymorphinidae, Bryozoa, Upper Cretaceous, Paleocene.

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“…Emersion and subaerial conditions can be excluded as the cause for lithification; this applies to all "hardgrounds" (VOIGT, 1959 ;HOLLMANN, 1964) connected with subsolution structures.…”

Section: Early Lithification In Moderate Deep Environmentsmentioning

confidence: 99%

Structural and Textural Evidence of Early Lithification in Fine‐grained Carbonate Rocks

Zankl

1969

Sedimentology

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SUMMARY Absence of compaction, intraformational breccias, resedimention, internal sediments and synsedimentary hardgrounds indicate early lithification of finegrained carbonate rocks. One of the factors controlling early lithification is the purity of lime mud. Less than 2% of insoluble residue (especially clay minerals) favours cementation and recrystallisation before further sediment accumulation causes compaction. Thus, early lithification is terminated in or near the environment of sedimentation. “Electrodiagenesis” is considered to be a possible mechanism for cementation.

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Die ökologische Bedeutung der Hartgründe („Hardgrounds”) in der oberen Kreide

Cited by 38 publications

References 4 publications

Faunal distribution and colonization strategy in a Middle Ordovician hardground community

Faunal distribution and colonization strategy in a Middle Ordovician hardground community

Bryozoans as substratum of fossil fistulose Foraminifera (Fam. Polymorphinidae)

Structural and Textural Evidence of Early Lithification in Fine‐grained Carbonate Rocks

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