““Sara understood this passion that beset geologists. Their minds were heavy with theories shaped by fire and water, their pockets weighted with residual bits of evidence chipped from road cuts and canyon walls, identifiable, able to be pigeonholed in time that stretched back five hundred million years. She understood that the rock in the Canadian's hand was likely to endure intact long after the bones of the four people in this room would be discovered set in sandstone among snail shells and ferns.””