Geological summary of NW Europe.
The first geological map of Ireland was prepared for the Railways Commission in 1839 (work was somewhat in preparation for the previous 28 years).
The Geological Survey of Ireland was founded in 1845. Ireland was the first country in the world to be mapped at a scale of 6 inches to the mile or 1:10,000. These original 6-inch sheets, completed in 1895, are still consulted today.
To learn more about the art of mapping in the C19th please read this overview.
Source: www.fossiel .net