E: further information on this profile can be found here: https://slrpnk.net/comment/2220869
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What do the different colours mean? Does it indicate a good or bad soil?
Those are the different soil horizons, which are basically just layers of soil with different properties. If you're interested in checking out actual soil profiles, the NRCS Web Soil Survey is a super cool website for the US.
This is the answer. The closest soil under the US taxonomy would be a spodsol.