A sedimentary rock that contains visible plastic and other materials is often referred to as "plastic sandstone" or "plastic-bearing sedimentary rock." However, in a broader context, such deposits can also be described as "anthropogenic sediments" or "modern sediments," which include various types of human-made materials, including plastics. These rocks may form in environments influenced by human activity, where natural sedimentation processes incorporate artificial debris.
In coastal areas, for example, plastic waste can become part of the sedimentary layers, especially in beach and marine environments. Over time, with compaction and cementation, these materials can form a rock-like structure that exhibits features typical of sedimentary rocks but contains synthetic materials.
It's important to note that while some sedimentary rocks can contain anthropogenic materials, they may not fit traditional classifications of sedimentary rocks that are primarily composed of mineral fragments and organic matter. Such findings may raise ecological concerns and signal pollution in the environment.