Qualitative and quantitative studies of pigments in marine sediments, using chromatographic and spectrophotometric methods, showed the presence of degradation products of chlorophylls; some of their optical properties are given. It is concluded that pigments decompose rapidly in aerated, coarse-grained sediment whereas in deeper layers of the same sediment, under anaerobic conditions, decomposition is slow....
Laevastu, Taivo. 1958. "The occurrence of pigments in marine sediments." Journal of Marine Research 17, (1). https://elischolar.library.yale.edu/journal_of_marine_research/923