TWELVE-THOUSAND YEARS AGO, THE GLACIERS receded from modern-day British Columbia, leaving the land to bleed silt into the sea. In the salty shallows hugging the coast, bivalves struggled to survive, growing slow and dying small in the fluctuating temperatures of the newly thawed ocean. Their shells fell to the floor and built up on beaches, forming layers of calcium carbonate that, today, archaeologists in galoshes dig through, deciphering the story of this land in clamshells.
Read more at Atlas Obscura. Photo credit: Simon Fraser University, CC BY 2.0.