Different oceanic sediments and sedimentary rocks characteristically form at different water depths, reflecting the depth-dependent dissolution of carbonate and silica: shallow-water carbonate buildups like Lepidocyclina limestone form on shelves and banks, pteropod (aragonite) ooze forms above the shallower aragonite compensation depth, Globigerina (calcite) ooze forms below that but above the deeper calcite compensation depth, and radiolarian (siliceous) chert/ooze forms in the deepest water below the CCD where all calcium carbonate has dissolved.
Sediment type distribution with depth is controlled by carbonate/silica dissolution chemistry. Lepidocyclina limestone is a shallow-water, warm, well-lit shelf/bank carbonate deposit (large benthic foraminifera require...
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