The answer which most correctly describes the relative ages of the rock units visible in the placemark a popup balloon is, "The shales and mudstones to the west are older than shales and sandstones to the east."
Finding the relative age of rock is important for understanding Earth's history. Relative age of rocks is defined as the geological age of a fossil rock, organism, or event relative to other rocks, organisms, features, or events.
Mudstones and shales are made up of silt and clay sized particles which are too small. Thus, the only difference between mudstone and shale is that the mudstones break into blocky pieces whereas, the shales break into thin chips.
Hence, mudstones and shales are both made of ancient mud.
To learn more about shales here:
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