For determining the age of fossils. Done by finding the location of the source of the first geological map of Thailand: Department of Mineral Resources of 250,000. Using map numbers 1501s.
For the fossil's age by looking for the position of academic resources from geological map. Thai country size 1: 250000 of the Department of mineral resources using a map number 1501S.
For the ancient ruins of the era of doing to find the location of the study area from the map geology Thailand size 1:250,000 of the Department of Mineral Resources by using the map number 1501 S