caption: The image shows a topographic map of the area with a black line in the middle of it, which is believed to be a geologic map from 1882. The map is detailed and shows the various geological features of the land, such as mountains, rivers, and valleys, as well as the contours of the terrain. The black line is likely used to indicate the location of the geologic features, while the white line may be used to identify the contour lines.