Seagrass/seaweed meadows represent over-looked diversity hotspots. They are key contributors to the production and accumulation of organic matter, and thus a significant factor controlling biodiversity and sedimentation in the shelf areas. In the fossil record their role and significance has not yet been fully understood. Since seagrasses/seaweeds are not well predisposed for fossilization, the primary aim of this project is to use a set of indirect markers/proxies (combination of paleontology and organic geochemistry) to be able to identify them in the fossil record.