Lichen as a dating tool

The two live symbiotically, each contributing to the survival of the other.The three main types of lichens found in New England are: crustose, foliose, and fructicose.One way to be more precise is to see if there is more than one colony of lichens on the wall.Once one colony of lichens has started it is easier for others to develop.An artifact might not have any lichens on it, yet it could still be much older than expected.Lichenometry is often the only way to find out when a stone wall was built. On dry days, lichens can become inactive and their metabolism can change significantly.’ Lichens can live and grow almost anywhere under very harsh conditions.First, we provide a maximum rate of growth of 0.31 cm/yr and, second we have established that the maximum growth occurs on the northwest face of rock.Lichens are an interesting life form comprised of part algae and part fungus.

14,000 calendar years based on varve chronology), and the age of landslide scarps or talus deposits, which are common in the steep terrain of the Green Mountains, might be determined.In addition, by measuring the lichen abundance on various rock faces, and at different heights above ground, we find that a major variable in growth rate is the facing direction of the rock surface, presumably related to solar radiation.Therefore, we can now address the two critical variables necessary for using lichen growth as a dating tool in central Vermont.The Golden Age for stonewalls is said to be from 1775-1825.Lichens tend to grow at a slow and regular rate, some only 1 millimeter per year.