Which statement is NOT true about a sedimentary facies?

The statement that fossil remnants will be consistent throughout the facies is not true. In sedimentary geology, a facies can be defined as a body of sediment with distinct physical, chemical, and biological characteristics. Because facies can form under varying environmental conditions, the fossil content can vary significantly even within the same sedimentary formation.

Sedimentary facies can be influenced by changes in depositional environments, which can lead to different organisms thriving in different areas over time. Therefore, fossil assemblages are likely to differ from one facies to another, reflecting the different ecological conditions that existed during the time of deposition.

The other options highlight valid aspects of sedimentary facies. Mineralogy can indeed vary laterally due to changing environmental conditions that influence sediment composition. Biofacies, which refer to the specific biological content of sediment, may not always align with lithofacies that are defined primarily by their rock type. Additionally, it is possible for subdivisions in facies to be based on biological content without strictly adhering to lithological characteristics, showcasing the versatility in facies classification based on different criteria.