This image shows a hag stone (also known as an Odin stone, adder stone, or holey rock), which is a unique rock featuring naturally bored holes. [1, 2]How They Are FormedMarine Organisms: The smooth, cylindrical holes are primarily carved by boring bivalve mollusks, such as piddocks (Pholas dactylus). These creatures slowly scrape away at soft sandstone or limestone to create protective burrows. [1, 2]Water Erosion: Over time, wave action and tumbling pebbles expand and smooth these cavities into distinct, fluid holes. [1, 2]Fossil Dissolution: In some cases, holes are created when acidic water dissolves fossilized structures, like ancient crinoid stems, trapped within the rock measures 4 in x 2.5 in x 1.5 in

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