Which feature is often formed by lacustrine deposits?

Lacustrine deposits are formed from sediments that settle in lake environments. One of the defining features of these deposits is the presence of varves, which are distinct layers that typically consist of alternating fine and coarse material. These layers are formed primarily due to seasonal variations in sediment accumulation and water conditions within the lake. During warmer months, higher rates of sedimentation might lead to coarser materials settling, while during colder months, fine silts and clays can settle. This seasonal layering results in a clear, visible pattern that can be counted, much like tree rings, to derive historical climate and environmental conditions. The presence of varves is a strong indicator of lacustrine processes, making this choice the correct answer in relation to the question about features formed by these deposits.