bedrock

Noun
  1. Solid unweathered rock lying beneath surface deposits of soil (synset 109240951)
    is a type of: rock, stone - a lump or mass of hard consolidated mineral matter
  2. Principles from which other truths can be derived (synset 105879984)
    "first you must learn the fundamentals"; "let's get down to basics"
    is a type of: principle - a basic truth or law or assumption
    subtypes: abc, abc's, abcs, alphabet, first principles, rudiments - the elementary stages of any subject (usually plural)
    same as: basic principle, basics, fundamental principle, fundamentals

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