Old-growth forests are widely valued for their ecological richness, but not all old-growth forests provide the same conservation value. This study explores the concept of ecological continuity as a critical factor in assessing forest conservation priorities. Instead of focusing solely on tree age, we propose evaluating how long a forest has remained continuously wooded, as this affects species composition and biodiversity. Lichens, particularly calicioid species, serve as effective indicators of ecological continuity, reflecting the long-term stability of forested environments. We discuss how these lichens can be used to develop an Index of Ecological Continuity (IEC), aiding conservation decisions. Further research is needed to refine lichen indicator species for Newfoundland and Labrador, which can inform protected area planning. Understanding ecological continuity can help prioritize forests with the highest biodiversity value, ensuring more effective conservation efforts