👉 Ichthyolitic is a type of rock formation that contains organic matter, specifically algae and other microorganisms. These rocks are often found in bodies of water like rivers or lakes, but they can also occur on land where they may be formed from decomposing organic material. Ichthyolites are characterized by their high silica content, which makes them hard and resistant to erosion. They are important for the health of aquatic ecosystems and have been used as a natural fertilizer in some areas.
