🐚🦴🪨

#fossil #shell rock #coquina #sedimentary rock #paleontology #marine deposit #biogenic rock

🪨⚪️🐚

#limestone #chalk #shell rock #calcium carbonate #sedimentary rock #biogenic rock

💧🐚🪲

#limestone #chemical sedimentary rock #biogenic rock #marine environment #calcium carbonate

🦠➡️🪨

#biological rock #biogenic rock #microbialite #stromatolite #geobiology #microbe rock