Sapropel is a term used in marine geology to describe dark-coloured sediments that are rich in organic matter. Organic carbon concentrations in sapropels commonly exceed 2 wt.% in weight.
Contrast lithologic borders between coccolitic mud (Unit 1), sapropel mud (Unit 2), seekreide (lutite) (Unit 3), geological research along the route of South Stream pipeline with R/V Akademik (June, 2009) in the Bulgarian Exclusive Economic Zone in the Black Sea, depth 1500 m.
The Black Sea is a marginal mediterranean sea lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. The Black Sea is supplied by major rivers, principally the Danube, Dnieper and Dniester. Consequently, while six countries have a coastline on the sea, its drainage basin includes parts of 24 countries in Europe.
The estuary of the Veleka in the Black Sea. Longshore drift has deposited sediment along the shoreline which has led to the formation of a spit (Sinemorets, Bulgaria).
Black Sea coast of western Georgia, with the skyline of Batumi on the horizon
Swallow's Nest in Crimea
Coastline of Samsun in Turkey