Coarse substrate is composed of 80% or more of gravel, or 5% or more gravel with 90% or more sand.
Source:
Populus J., Vasquez M., Albrecht J., Manca E., Agnesi S., Al Hamdani Z., Andersen J., Annunziatellis A., Bekkby T., Bruschi A., Doncheva V., Drakopoulou V., Duncan G., Inghilesi R., Kyriakidou C., Lalli F., Lillis H., Mo G., Muresan M., Salomidi M., Sakellariou D., Simboura M., Teaca A., Tezcan D., Todorova V. and Tunesi L., 2017. EUSeaMap, a European broad-scale seabed habitat map. 174p. http://doi.org/10.13155/49975
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