Note: The game refers to all nodes as 'fossil node.' The names used are pulled from the data for ease of organization. All info is from the wiki (https://coralisland.fandom.com/wiki/Fossil=
Small node: Tilling soil, breaking rocks (main map), breaking sandstone (main map)
Medium node: Tilling soil, breaking medium or large rocks (main map), breaking sandstone (main map)
Large node: Tilling soil, breaking large rocks (main map), breaking sandstone (main map)
Mysterious node: Tilling sand, clearing trash (diving), breaking sandstone (diving)
Water node: Tilling sand (beach, diving), clearing trash (diving), breaking sandstone (diving)