Assertion: peat | /r/MadeOf | swamp forests
Facets:
Source sentences:
text: It is relatively easy to segregate the structural features into layers of peat formed by sedge marshes, swamp forests, and sphagnum moss bogs, but a classification of muskegs cannot be based on the assumption that the present surface vegetation and the texture and other characteristics or properties of the peat material just below the surface express significant differences.