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![Stromatolites are club-shaped structures formed by a slow buildup of microbialmats trapping ooid sands nur03511.jpg Stromatolites are club-shaped structures formed by a slow buildup of microbialmats trapping ooid sands](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_nur03511.jpg?itok=mb-ZJMSQ)
Description
Stromatolites are club-shaped structures formed by a slow buildup of microbialmats trapping ooid sands. These form in high energy channels where migratingsand dunes and chemical precipitation of carbonate cement are dominant seafloorprocesses. (Image credit: OAR/National Undersea Research Program (NURP))