Lichens on the York City Walls 3

Lichens on the York City Walls 3

Observation - Lichens on the York City Walls 3 - UK and Ireland. Description: On the York City Walls near Monk bar, which is made up largely of magnesian limestone, which is more acid-resistant than carboniferous limestone. It is a dolomitic limestone.

On the York City Walls near Monk bar, which is made up largely of magnesian limestone, which is more acid-resistant than carboniferous limestone. It is a dolomitic limestone.