Fossiliferous refers to sedimentary rocks that contain a significant number of fossils or fossil fragments. These rocks, such as fossiliferous limestone or shale, are important in paleontology and stratigraphy, providing valuable information about past life, environmental conditions, and the age of rock layers.
Source Prothero, D. R. (2004). Bringing Fossils to Life: An Introduction to Paleobiology. McGraw-Hill.