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Paleontology and diagenesis of Upper Jurassic siliceous sponges from the Mazagan Escarpment ArchiMer
Lang, B; Steiger, T.
During the CYAMAZ deep diving project, two well preserved Upper Jurassic siliceous sponges were recovered from columnar stromatolitic peloidal packstones which constitute the main lithology at the Mazagan Escarpment. These sponges belong to the genera Thyroidium leptophyllum (Quenstedt) and Paracraticularia sp. Thyroidium leptophyllum is known to be not younger than Kimmeridgian. This sponge is thus an important fossil for dating the massive core of the Mazagan platform margin. Thin-sections of other samples show that siliceous sponges are not limited to the stromatolitic peloidal facies, but were also found in hemipelagic calpionellid limestones. Diagenesis of the siliceous sponges is characterized by the dissolution of the skeletal lattice at different...
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Ano: 1985 URL: http://archimer.ifremer.fr/doc/00247/35837/34347.pdf
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