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Papers by Francis Tourneur
Spanish journal of palaeontology, Aug 11, 2022
Spanish journal of palaeontology, Aug 11, 2022
The genus Caliapora Schlüter 1889 is subdivided in three subgenera: Caliapora (Caliapora) Schlüte... more The genus Caliapora Schlüter 1889 is subdivided in three subgenera: Caliapora (Caliapora) Schlüter, 1889, limited to the Givetian; Caliapora (Mariusilites) Mironova, 1974 pro bably the direct ancestor of Caliapora (Caliapora) and known from the Lowermost Devonian until the Lower Givetian; and Caliapora (Luciaella) nov. subgen., from the Upper Emsian-Lower Eifelian of the Cantabrian Mountains (NW Spain). The genus Caliapora is recorded for the first time from the Cantabrian Mountains with Caliapora (Mariusilites) cf. chaetetoides Lecompte, 1939 and Caliapora (Luciaella) daedala nov. sp. Sorne general considerations concerning the genus Caliapora are developed: the systematic position of the genus at familial level, the stratigraphical range of the different subgenera, the paleogeographical repartition and the paleoecological requirements.
Spanish journal of palaeontology, Aug 10, 2022
Tabulate corals from the Lower Devonian Lorito Limestones (Cordoba Province) are described in det... more Tabulate corals from the Lower Devonian Lorito Limestones (Cordoba Province) are described in detail and they are assigned to Paras/riatopora ex gr. annu/a/a (Le Ma'itre, 1952), a group until now mostly known from North Africa and Armorica. The Lori to Limestones probably belong to the upper part of the Gedinnian, according to their tabulate coral fauna content. The microstructural evolution of the median lamina of the wall, from the axial part of the branches until the periphery, is described in detail. We observed a replacement of granules by elongated rods and, close to the surface of the corallum, a complete disappearance of any median structure. This feature is compared with other cases, of known branching tabulate corals.
Communication et Abstract, p 368-369info:eu-repo/semantics/nonPublishe
Communication et Abstract, p 126info:eu-repo/semantics/nonPublishe
Spanish journal of palaeontology, Feb 23, 2022
The structural and microstructural study of some devonian 'Favosites' shows the persisten... more The structural and microstructural study of some devonian 'Favosites' shows the persistence of the microlamellar species related to Paleofavosites until the lower Eifelian. The evolution of the wall is characterized by an increase of the size of the microlamellae and the substitution of the granules of the median dark line by fiber-like units. (C) Academie des sciences/Elsevier, Paris.
PalZ
Colonial heterocorals are uncommon faunal component of the Serpukhovian limestones of the Montagn... more Colonial heterocorals are uncommon faunal component of the Serpukhovian limestones of the Montagne Noire and Pyrenees in southern France. Four species are introduced into the newly established genus Semenomalophyllia . They all share the typical septal arrangement of heterocorals, at least in early stage of development. The fused axial ends of septa commonly withdraw during the ontogeny of larger sized species such as Semenomalophyllia herbigi and S. perretae . In S. weyeri , the septa are withdrawn from the axis and arranged in two series (‘minor’ and ‘major’) that show a striking morphological convergence with rugose corals. The corallites of the smallest species S. webbi are very similar to the solitary heterocorallian Heterophyllia ornata and possibly evolved from it. S. weyeri and S. perretae are commonly colonised by alcyonacean octocorals as indicated by the occurrence of sclerites covering the corallites. These are described as Lafustalcyon vachardi gen. et sp. nov., a new taxon yet only known in the Serpukhovian strata, and only affecting heterocoral colonies. In addition to the alcyonacean octocorals, a diverse assemblage of epibionts colonised the heterocorals: calcifying microbes, bryozoans, foraminifers, microconchids, crinoids, boring organisms, and microproblematica. Syn-vivo relationships can be demonstrated only between Semenomalophyllia and Lafustalcyon as the first commonly bio-immured the second. Other encrusting organisms could have colonised either living, erected colonies or broken or tilted dead colonies.
Société archéologique de Namur, 2021
Société Archéologique de Namur, Sep 1, 2021
Déterminer précisément l'origine des pierres de type « marbre noir » uti[isées dans le bâti/mobil... more Déterminer précisément l'origine des pierres de type « marbre noir » uti[isées dans le bâti/mobilier demeure un challenge pour les historiens de l'art et les géologues. Dans l'église Sai\\nt-Loup,
Communication et Abstractinfo:eu-repo/semantics/nonPublishe
Neues Jahrbuch für Geologie und Paläontologie - Monatshefte, 1995
Geological Journal, 2018
Most Alcyonacea (subclass Octocorallia) have skeletons made up of small calcareous pieces called ... more Most Alcyonacea (subclass Octocorallia) have skeletons made up of small calcareous pieces called sclerites that are difficult to both preserve and recognize, which explains the scarce and irregular fossil record of the group. In this work, we study 56 geological samples bearing Syringoalcyon, a genus constituted by Alcyonacea represented by sclerites encrusting the outer walls and stolons of a syringoporoid coral. These samples come from 18 Silurian to mostly Carboniferous localities in Canada, USA, Mexico, Morocco, Algeria, Spain, Iran, and China. A morphological and numerical study was carried out to determine the main morphological and palaeobiological features of the sclerites and the Alcyonacea itself and to establish a new genus for these sclerites. The study facilitated distinguishing four sclerite morphotypes (spindle, elongate spindle, club, and arrowhead). Live sclerites can be attached through biotic or abiotic linkages to biotic substrate patches by insertion or cementat...
Les a u te u rs p ré se n te n t des p ro p o sitio n s p o u r u n ifo rm is e r la subdivision ... more Les a u te u rs p ré se n te n t des p ro p o sitio n s p o u r u n ifo rm is e r la subdivision en fo rm a tio n s du D évonien M oyen du S y n c lin o riu m de D in a n t, du S y n c lin o riu m de N a m u r e t du M assif de la Vesdre. Dans le C ou vin ien (som m e t de l'E m sie n et E ifelien) e t le G ive tie n du bord sud du S y n c lin o riu m de D in a n t, ils d is tin g u e n t d ix fo rm a tio n s fo rm e lle s e t une in fo rm e lle , q u i so n t de bas en h a u t :
Spanish journal of palaeontology, Aug 11, 2022
Spanish journal of palaeontology, Aug 11, 2022
The genus Caliapora Schlüter 1889 is subdivided in three subgenera: Caliapora (Caliapora) Schlüte... more The genus Caliapora Schlüter 1889 is subdivided in three subgenera: Caliapora (Caliapora) Schlüter, 1889, limited to the Givetian; Caliapora (Mariusilites) Mironova, 1974 pro bably the direct ancestor of Caliapora (Caliapora) and known from the Lowermost Devonian until the Lower Givetian; and Caliapora (Luciaella) nov. subgen., from the Upper Emsian-Lower Eifelian of the Cantabrian Mountains (NW Spain). The genus Caliapora is recorded for the first time from the Cantabrian Mountains with Caliapora (Mariusilites) cf. chaetetoides Lecompte, 1939 and Caliapora (Luciaella) daedala nov. sp. Sorne general considerations concerning the genus Caliapora are developed: the systematic position of the genus at familial level, the stratigraphical range of the different subgenera, the paleogeographical repartition and the paleoecological requirements.
Spanish journal of palaeontology, Aug 10, 2022
Tabulate corals from the Lower Devonian Lorito Limestones (Cordoba Province) are described in det... more Tabulate corals from the Lower Devonian Lorito Limestones (Cordoba Province) are described in detail and they are assigned to Paras/riatopora ex gr. annu/a/a (Le Ma'itre, 1952), a group until now mostly known from North Africa and Armorica. The Lori to Limestones probably belong to the upper part of the Gedinnian, according to their tabulate coral fauna content. The microstructural evolution of the median lamina of the wall, from the axial part of the branches until the periphery, is described in detail. We observed a replacement of granules by elongated rods and, close to the surface of the corallum, a complete disappearance of any median structure. This feature is compared with other cases, of known branching tabulate corals.
Communication et Abstract, p 368-369info:eu-repo/semantics/nonPublishe
Communication et Abstract, p 126info:eu-repo/semantics/nonPublishe
Spanish journal of palaeontology, Feb 23, 2022
The structural and microstructural study of some devonian 'Favosites' shows the persisten... more The structural and microstructural study of some devonian 'Favosites' shows the persistence of the microlamellar species related to Paleofavosites until the lower Eifelian. The evolution of the wall is characterized by an increase of the size of the microlamellae and the substitution of the granules of the median dark line by fiber-like units. (C) Academie des sciences/Elsevier, Paris.
PalZ
Colonial heterocorals are uncommon faunal component of the Serpukhovian limestones of the Montagn... more Colonial heterocorals are uncommon faunal component of the Serpukhovian limestones of the Montagne Noire and Pyrenees in southern France. Four species are introduced into the newly established genus Semenomalophyllia . They all share the typical septal arrangement of heterocorals, at least in early stage of development. The fused axial ends of septa commonly withdraw during the ontogeny of larger sized species such as Semenomalophyllia herbigi and S. perretae . In S. weyeri , the septa are withdrawn from the axis and arranged in two series (‘minor’ and ‘major’) that show a striking morphological convergence with rugose corals. The corallites of the smallest species S. webbi are very similar to the solitary heterocorallian Heterophyllia ornata and possibly evolved from it. S. weyeri and S. perretae are commonly colonised by alcyonacean octocorals as indicated by the occurrence of sclerites covering the corallites. These are described as Lafustalcyon vachardi gen. et sp. nov., a new taxon yet only known in the Serpukhovian strata, and only affecting heterocoral colonies. In addition to the alcyonacean octocorals, a diverse assemblage of epibionts colonised the heterocorals: calcifying microbes, bryozoans, foraminifers, microconchids, crinoids, boring organisms, and microproblematica. Syn-vivo relationships can be demonstrated only between Semenomalophyllia and Lafustalcyon as the first commonly bio-immured the second. Other encrusting organisms could have colonised either living, erected colonies or broken or tilted dead colonies.
Société archéologique de Namur, 2021
Société Archéologique de Namur, Sep 1, 2021
Déterminer précisément l'origine des pierres de type « marbre noir » uti[isées dans le bâti/mobil... more Déterminer précisément l'origine des pierres de type « marbre noir » uti[isées dans le bâti/mobilier demeure un challenge pour les historiens de l'art et les géologues. Dans l'église Sai\\nt-Loup,
Communication et Abstractinfo:eu-repo/semantics/nonPublishe
Neues Jahrbuch für Geologie und Paläontologie - Monatshefte, 1995
Geological Journal, 2018
Most Alcyonacea (subclass Octocorallia) have skeletons made up of small calcareous pieces called ... more Most Alcyonacea (subclass Octocorallia) have skeletons made up of small calcareous pieces called sclerites that are difficult to both preserve and recognize, which explains the scarce and irregular fossil record of the group. In this work, we study 56 geological samples bearing Syringoalcyon, a genus constituted by Alcyonacea represented by sclerites encrusting the outer walls and stolons of a syringoporoid coral. These samples come from 18 Silurian to mostly Carboniferous localities in Canada, USA, Mexico, Morocco, Algeria, Spain, Iran, and China. A morphological and numerical study was carried out to determine the main morphological and palaeobiological features of the sclerites and the Alcyonacea itself and to establish a new genus for these sclerites. The study facilitated distinguishing four sclerite morphotypes (spindle, elongate spindle, club, and arrowhead). Live sclerites can be attached through biotic or abiotic linkages to biotic substrate patches by insertion or cementat...
Les a u te u rs p ré se n te n t des p ro p o sitio n s p o u r u n ifo rm is e r la subdivision ... more Les a u te u rs p ré se n te n t des p ro p o sitio n s p o u r u n ifo rm is e r la subdivision en fo rm a tio n s du D évonien M oyen du S y n c lin o riu m de D in a n t, du S y n c lin o riu m de N a m u r e t du M assif de la Vesdre. Dans le C ou vin ien (som m e t de l'E m sie n et E ifelien) e t le G ive tie n du bord sud du S y n c lin o riu m de D in a n t, ils d is tin g u e n t d ix fo rm a tio n s fo rm e lle s e t une in fo rm e lle , q u i so n t de bas en h a u t :