Answer
**Answer: Biostratigraphy Principles** Biostratigraphy is a geological dating method that utilizes the analysis and comparison of fossils found in different rock layers. Cuvier and Brongniart established the principles of biostratigraphy by observing that distinct fossil assemblages characterize specific geological periods, allowing for the relative dating of rock strata. This pioneering work laid the foundation for the development of the modern field of paleontology and the ability to reconstruct Earth's history.