This is a vintage geological diagram, likely a hand-drawn illustration from the 19th century. It depicts a cross-section of coal strata, showing layers of different colored rock and coal seams. The diagram is divided into sections representing different layers of earth. These layers are depicted as rectangles of varying colors: shades of brown, tan, gray, and black, representing different types of rock and coal. Darker bands run horizontally across several layers, indicating coal seams. A prominent feature is a reddish-pink vertical band labeled "Dike & Fault," which cuts through several layers, indicating a geological fault line. To the left, a vertical black rectangle is labeled "Shaft," representing a mine shaft. The bottom of the diagram has the text "50 C O A L S T R A T A." in bold, block letters. A small signature or inscription is visible in the bottom right corner. The entire image is framed by a simple black border. The paper has a slightly aged, textured appearance, with some discoloration and wear, typical of antique documents.