Final answer:
Cutoff meanders are not associated with braided rivers. Braided rivers are instead characterized by an abundant supply of sediment, a broad plain, and various sizes of sediment deposits. Environments with high energy like rapidly moving water are less suitable for preserving fossils due to their destructive nature.
Step-by-step explanation:
The feature NOT associated with many braided rivers is "Cutoff meanders". Braided rivers are characterized by an abundant supply of sediment, a broad sediment-covered plain, and a range of sediment sizes. They consist of a network of river channels that split and rejoin, often containing small, temporary islands. By contrast, cutoff meanders are more commonly associated with meandering rivers, where a bend in the river becomes so exaggerated that the river cuts through the neck of the meander, leaving behind an isolated loop known as an oxbow lake.
The environment that describes a braided river is one with "mostly sand deposits with some sediment beds having a layer of gravel on the bottom and cross-bedding". A braided river deposits a variety of sediment sizes, including sand and gravel, related to the changes in water velocity and the transport capacity of the river's multiple channels.
Sedimentary environments that are not suitable for preserving fossils typically have conditions that do not allow for the quick burial and protection of organic remains. These can include environments with high energy such as rapidly moving water that can destroy or scatter remains before they are buried.