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The sedimentary facies outcropping some parts of the Ise Formation, Dahomey Basin as exposed in the study area have been subjected to sedimentological and petrological analyses. The study focused on deciphering the paleodepositional environment and attempting a classification of the sandstone. Field studies and laboratory analyses were carried out to determine and document the mineralogy, texture, transportation history, classification, provenance and paleodepositional environment. Results from the granulometric analysis showed that sandstones which are mainly fluvial, were deposited within alluvial, braided-streams and meandering subenvironments ranging from medium-grained to pebbly sand, poorly sorted (average 1.27Ф), with few moderately to very well sorted (average 0.96 Ф to 0.29 Ф) and with skewness values that is predominantly fine skewed. Thin section petrographic results revealed quartz as the most common and abundant mineral while feldspar, mica, rock fragment, and accessory minerals were minor components, the sandstone is therefore classified as quartz arenites and wackes. The transportation history shows that the sediments of the studied area are still relatively very close to the provenance. The main cementing minerals identified in the studied sandstones include: iron oxide, quartz and clay with iron oxide dominating. The iron oxide appeared as coating on detrital grains, stain clay matrix or disseminated within the sediments. Detrital mineralogy of the analysed sandstone samples indicates that the source rock lithology is related to igneous and metamorphic origin with little or no contribution from sedimentary origin suggesting continental block setting within the cratonic interior provenances.

Petrographic Studies and Paleoenvironmental Reconstruction of Some Outcropping Sediments in Parts of Eastern Dahomey Basin, South Western, Nigeria