Observations sur les structures internes et le developpement des Microcodium

Lucas, Gabriel; Christian, Michel

doi:10.2113/gssgfbull.s7-ix.6.909

Cited by 13 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…With regard to the smaller Microcodiimi (b) forms of Esteban (1972) which are possibly equivalent to the 'seed-plots' of Lucas & Montenat (1967) and Microrodiuni described by Montenat & Echallier (1977), their occurrence at the perimeter of rhizocretions or subjacent to root channel walls, displaying either a concentric arrangement in transverse sections or palisade rows in longitudinal sections, suggests an intimate relationship with plant root systems. They occur both in the Ancient and Recent.…”

Section: O M P a R I S O N S Between Ancient A N D Recent M I C R 0mentioning

confidence: 94%

“…Because of this factor, Gottis (1963) suggested that Microcodium was an obligatory heterotroph. Lucas & Montenat (1967) overcame this problem by considering Microcodium to be the result of the activities of colonial bacteria. Wood & Basson (1972) state that the occurrence of their specimens and presence of chitin suggest that the organism could be a fungus.…”

Section: Biogenic Aspectsmentioning

confidence: 99%

“…This has been covered by the study of Bodergat (1974). After reviewing this work, together with the studies of Esteban (1972Esteban ( , 1974, Freytet (1969Freytet ( , 197 1 a, I97 1 b, 1973, Lucas & Montenat ( 1967) and Truc ( 1975a, I975b), and using my own findings on the same material, it has been possible to make comparisons between Ancient and Recent Micrococlium.…”

Section: A N C I E N T M L C R O C O D L U Mmentioning

confidence: 99%

“…Apart from the mere noting of its presence, and recording its facies associations, our understeinding of Microcodiirm was not advanced until Lucas & Montenat (1967) described and interpreted its internal structure. More recently, Bodergat (1974) has given a detailed petrographic and geochemical analysis of Microcodium.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Biolithogenesis of Microcodium: elucidation

Klappa

1978

Sedimentology

161

View full text Add to dashboard Cite

Petrographic studies of Tertiary and Pleistocene caliche from the western Mediterranean show some unusual calcite structures. These structures were designated Microcodium elegans Glück 1912. New data are presented which question earlier interpretations with regard to the origin of this structure. The new discovery of Microcodium in Recent soils extends its stratigraphic range into the Holocene. Retention of fine detail in Recent samples, revealed by light microscopy and SEM, has suggested an origin hitherto unconsidered, calcification of mycorrhizal associations. Ancient and Recent Microcodium fabrics are compared; sufficient preservation of ultrastructure in the Ancient indicates a homologous origin. Environmental, stratigraphic and palaeoecological significance of Microcodium is discussed: correct recognition indicates existence of a palaeosol, and hence is a valuable criterion for recognition of continental conditions, cessation of sedimentation, subaerial exposure, and time‐equivalent horizons. In particular. Microcodium is a characteristic component of caliche in the western Mediterranean. A review of the literature suggests that its presence may have been overlooked or misinterpreted in other parts of the world and, thus, may be more widespread than hitherto suspected. This study, in its embryonic stage of development. illumines the potential importance of biolithogenesis within terrestial carbonates.

show abstract

Section: O M P a R I S O N S Between Ancient A N D Recent M I C R 0mentioning

confidence: 94%

Section: Biogenic Aspectsmentioning

confidence: 99%

Section: A N C I E N T M L C R O C O D L U Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biolithogenesis of Microcodium: elucidation

Klappa

1978

Sedimentology

161

View full text Add to dashboard Cite

show abstract

“…Los fósiles comunes en esta microfacies son: a) fungal fruiting bodies (Goldstein 1988, fig. 8B); b) cuerpos circulares con diámetros entre 30 y 50 µm, y cuerpos ovalados con tamaños entre 50 y 70 µm, que son reemplazados internamente por cristales de calcita espar radiales; corresponden a microcodium (Košir 2004;Lucas y Montenat 1967); c) cuerpos circulares con diámetro entre 20 y 40 µm, constituidos por un solo cristal de calcita espar; rodeados por un anillo constituido por cristales subrectangulares de calcita, corresponden a quistes de dinoflagelados calcáreos (Reháková 2000); d) cuerpos circulares con diámetros entre 20 y 40 µm; internamente son un solo cristal de calcita espar, rodeados por un anillo pardo oscuro, ocráceo, que corresponden a quistes de dinoflagelados calcáreos (Reháková 2000), y e) escasas conchillas de foraminíferos y, con menos frecuencia, fragmentos de bivalvos de hasta 60 μm. La presencia de cuarzo puede superar el 10 %; además, hay presencia de moscovita.…”

Section: Leyendaunclassified