MIOCENE BENTHIC FORAMINIFERA FROM NOSY MAHAKAMBY AND AMPARAFAKA, MAHAJANGA BASIN, NORTHWESTERN MADAGASCAR
Our study reports a new comprehensive microfossil assemblage, results of detailed investigation of a Miocene sequence on Nosy Mahakamby, a small island off northwest Madagascar. This island is approximately 50 km west along the coast from the regional capital Mahajanga. This work was based on two field seasons carried out between 2010 and 2011.
After washing, sieving and sorting the sediments from the island (30 kg), twenty-five genera of foraminifera were identified including Quinqueloculina, Elphidium, Nonion, and Ammonia.
In association with the foraminifera, are ostracods plus a variety of others macrofossils including bivalves, gastropods, echinoids, sharks, non-diagnostics reptiles (turtles, crocodylians) and sirenians. Together, the assemblage indicates that the Nosy Mahakamby area in the late Miocene was as a tropical, near-shore environment, probably not too dissimilar to that of today.