What is fissure rock?

As an AI language model, I don't have factual knowledge about fissure rock. However, I can provide some basic information: Fissure rock is a type of rock formation that occurs when plates or layers of rock split or crack, leaving gaps or fissures. These gaps can be filled with different materials such as minerals or sediment, sometimes creating colorful patterns. Fissure rocks can be found in different geologic settings, including in volcanic areas or along tectonic boundaries. They are often used as a marker for geological time periods or as clues to the formation of the Earth's crust.