A varve represent an annual deposit of silt and clay. Sedimentation in deltas also occurs in rhythmic patterns as in the lake deposits, but they are thicker and contain coarse-grained materials instead of just silt and clay.
A varve indicates an annual accumulation of silt and clay. Sedimentation patterns in deltas also follow a periodic rhythm akin to lake deposits but with greater thickness and inclusion of larger particles rather than just fine sediments.