This study addresses the problem of lithostratigraphy in the bottom sediments of the Siberian slope of the Lomonosov Ridge. It examines in detail the conditions and mechanisms governing the formation of gray layers, typically associated with glacial periods, and demonstrates how these layers can accumulate during interglacial intervals. Currently, the color characteristics of bottom sediments serve as one of the key factors in the stratigraphy of the Arctic sedimentary cover. Their use assumes that during interglacial periods and prolonged interstadials, brown—predominantly dark brown—layers of bottom sediments accumulate in the deep-water part of the Arctic Ocean, whereas glacial periods are marked by the deposition of gray, olive-gray, and beige sediments. This color differentiation across glacial cycle stages is attributed to the influx of manganese into the sediments. A significant portion (more than half) of the manganese is delivered to the Arctic basin via riverine input. During glacial phases, this input was drastically reduced, and a portion of the manganese became sequestered on the vast exposed shelves. In contrast, during interglacial phases, riverine discharge increased substantially, leading to greater manganese influx. An additional contributing factor is the remobilization of manganese accumulated on the shelves during glacial periods under interglacial transgression conditions. However, our data indicate that the gray layers in the sedimentary cover of the Siberian slope of the Lomonosov Ridge most likely formed at the beginning of interglacial periods. This pattern has been observed in the region for at least the last 120,000 years.