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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
Other Clues Help. If you find a fossil in the top layer thatâs older than a fossil in the lower layer, you can hypothesize that the layers have been turned upside down by folding during mountain building. Most rock sequences are incompleteâlayers are missing. These gaps in rock sequences are called unconformities.Unconformities develop when agents of erosion such as running water or glaciers remove rock layers by washing or scraping them away.ccording to the. principle of superposition. ,in undisturbed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top. Rock Layers Sediment accumulates in horizontal beds, forming layers of sedimentary rock.