Significance of ultrastructural features in etched conodonts

Burnett, Richard D.; Hall, Jack C.

doi:10.1017/s0022336000033783

Cited by 16 publications

(10 citation statements)

References 10 publications

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“…Remains of the organic outer layer, similar to the etching surfaces illustrated by Burnett & Hall (1992), can be observed on the surface of conodonts with sugary textures. This textural type is similar to those described in detail by Konigshof (1992).…”

Section: B Colour Alteration Index Valuesmentioning

confidence: 63%

Simultaneous use of thermal indicators to analyse the transition from diagenesis to metamorphism: an example from the Variscan Belt of northwest Spain

et al. 1997

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The transition from diagenesis to very low-grade metamorphism has been characterized by conodont colour alteration index (CAI), illite crystallinity (IC), clay-mineral assemblages and rock fabric in a transect (Cape PeAas-Cape Torres) located in the Cantabrian Zone (northwest Spain). IC values show a northwest to southeast change from epizonal to diagenetic values. CAI values show a general congruence for low-and high-grade areas. This correlation indicates that CAI values for the epizone are > 5.5, the anchizone 5.5 2 CAI > 4, and the diagenetic zone 5 4. Cleavage develops in incompetent rocks with CAI values greater than 3, mainly by pressure solution. Temperature increases towards the inner parts of the orogen (towards the northwest) and is considered to be related to the tectonic superposition caused by thrusting and folding. A gradient of 35 "Ckm is inferred for the transect. In the southeastern sector of the section there are several thermal anomalies that are attributed to the presence of epithermal fluids.

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Section: B Colour Alteration Index Valuesmentioning

confidence: 63%

Simultaneous use of thermal indicators to analyse the transition from diagenesis to metamorphism: an example from the Variscan Belt of northwest Spain

et al. 1997

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“…Specimen BU 2636, frame width 32.5 mm. 1986; Burnett & Hall 1992;Sansom et al 1992), but heavily criticized (e.g. Blieck 1992; Kemp & Nicoll 1993, 1995a,b, 1996Schultze 1996;Forey & Janvier 1993;Janvier 1995Janvier , 1996a.…”

Section: (A) Lamellar Crown Tissuementioning

confidence: 99%

Growth and patterning in the conodont skeleton

Donoghue

1998

Phil. Trans. R. Soc. Lond. B

109

146

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Recent advances in our understanding of conodont palaeobiology and functional morphology have rendered established hypotheses of element growth untenable. In order to address this problem, hard tissue histology is reviewed paying particular attention to the relationships during growth of the component hard tissues comprising conodont elements, and ignoring a priori assumptions of the homologies of these tissues. Conodont element growth is considered further in terms of the pattern of formation, of which four distinct types are described, all possibly derived from a primitive condition after heterochronic changes in the timing of various developmental stages. It is hoped that this may provide further means of unravelling conodont phylogeny. The manner in which the tissues grew is considered homologous with other vertebrate hard tissues, and the elements appear to have grown in a way similar to the growing scales and growing dentition of other vertebrates.

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“…These have been examined at the interspeci c level on a geological time-scale by Conway Morris and Harper (1988) and interpreted as controlled by genome size. On the intraspeci c level, modi cations of cell imprint shape are linked to conodont element relief (Pierce & Langenheim 1970;Budurov 1976;McCracken & Nowlan 1989;Burnett & Hall 1992;Zhuravlev 1994); variations in imprint size have been attributed to varying ecological factors (Zhuravlev 1994(Zhuravlev , 1997. Imprint patterns demonstrate weak dependence on ontogeny (von Bitter & Norby 1994a, b;Zhuravlev 1995).…”

mentioning

confidence: 99%

Variation in the outline and distribution of epithelial cell imprints on the surface of polygnathacean conodont elements

Журавлев

2001

LET

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Variation in the outline and distribution of epithelial cell imprints on the surface of polygnathacean conodont elements ANDREY V. ZHURAVLEV Zhuravlev, A.V. 2001 06 15: Variation in the outline and distribution of epithelial cell imprints on the surface of polygnathacean conodont elements. Lethaia, Vol. 34, pp. 136-142. Oslo. ISSN 0024-1164.The elements of many conodont taxa exhibit a polygonal surface micro-ornamentation. Four main types are recognized (striation, linear texture, regular (idiomorphic) texture and granular texture) and their distribution over the conodont elements of different morphology is considered. The intraspeci c (ontogenetic and ecological) and interspeci c (phylogenetic) causes of the reticulation texture variations are also considered. &Cell imprints, Conodonta, Polygnathacea Andrey V. Zhuravlev [stratigr@mail.wplus.net],

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Significance of ultrastructural features in etched conodonts

Cited by 16 publications

References 10 publications

Simultaneous use of thermal indicators to analyse the transition from diagenesis to metamorphism: an example from the Variscan Belt of northwest Spain

Simultaneous use of thermal indicators to analyse the transition from diagenesis to metamorphism: an example from the Variscan Belt of northwest Spain

Growth and patterning in the conodont skeleton

Variation in the outline and distribution of epithelial cell imprints on the surface of polygnathacean conodont elements

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