Zobrazeno 1 - 6
of 6
pro vyhledávání: '"Bertrand Amard"'
Autor:
Bertrand Amard, J. Bertrand-Sarfati
Publikováno v:
Precambrian Research. 81:197-221
A well-preserved microbial assemblage has been found in Paleoproterozoic cherty stromatolites from the 2000 Ma old Franceville Group. Gabon. This assemblage contains coccoids and star-like forms, filaments and budding tubular forms. These various for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68e234b3c253aaa8c833020117ca2de8
https://doi.org/10.1016/s0301-9268(96)00035-6
https://doi.org/10.1016/s0301-9268(96)00035-6
Autor:
Bertrand Amard
Publikováno v:
Journal of African Earth Sciences. 22:609-615
No ammonite has ever been reported in the Tademait plateau, Algerian Sahara, above the Turonian. A well-dated Upper Maastrichtian sequence has the first yielded Libycoceras ismaeli (Zittel) in the eastern part of the area. This stratigraphical positi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45a2e44b5e86ed5dc22e820543142939
https://doi.org/10.1016/0899-5362(96)00039-5
https://doi.org/10.1016/0899-5362(96)00039-5
Autor:
Bertrand Amard
Publikováno v:
Precambrian Research. 57:121-133
Mega-Acritarchs previously referred to as Chuaria circularis Walcott from the Late Proterozoic Pendjari Formation of Benin and Burkina-Faso (West Africa) are reinvestigated. Both optical microscopy of thin sections and scanning electron microscope st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16f692d4af504e04ab31b1816f8711b0
https://doi.org/10.1016/0301-9268(92)90096-7
https://doi.org/10.1016/0301-9268(92)90096-7
Publikováno v:
Geology. 23:133
Ediacara-type body fossils are reported here for the first time from the West African craton in Algeria. This assemblage comprises medusoids comparable to Medusinites sp. and Nimbia , a trace fossil, and a new genus of body fossil with uncertain affi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::435e515a8b1fa1a36ba699fb0d0d2481
https://doi.org/10.1130/0091-7613(1995)023<0133:feffiw>2.3.co
https://doi.org/10.1130/0091-7613(1995)023<0133:feffiw>2.3.co
Autor:
Bertrand Amard
Publikováno v:
Precambrian Research. 31:69-95
Earlier studies of Stromatolites had permitted the dating of the Atar Formation (Mauritania) as late Riphean by comparing these structures with those of the U.S.S.R. Geochronological data (Rb/Sr) obtained subsequently on illite had given ages ranging
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee35ecc44310cc1376532cd48f728604
https://doi.org/10.1016/0301-9268(86)90065-3
https://doi.org/10.1016/0301-9268(86)90065-3
Autor:
Alphonse Blondeau, Bertrand Amard
Publikováno v:
Geobios. 12:635-651
Resume Le Paleocene superieur du Tademait-E et Tinrhert-West caracterise par un renouvellement macrofaunistique et l'apparition d'une microfaune a Ranikothalia bermudezi, Il est suivi au Tademait-E d'un Eocene inferieur (Ilerdien basal) a Nummulites
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7e432beaf8acec94ceab26874432c9c1
https://doi.org/10.1016/s0016-6995(79)80094-7
https://doi.org/10.1016/s0016-6995(79)80094-7