According to Reformed Theology, is Natural Law based on the recognition of Absolute Values?

Advocates of Natural Law aver that knowledge of Morals are inherent in mankind, and that the "Conscience" in man causes him to adhere to them, with guilt feelings when disobeyed. But are these morals based on, or "flowing from", Absolute Values; or do "mores and folk ways" of a society trump them? And whence the "list" of Absolute Values? How are they discovered? Is God behind the revelation of them...to those who sincerely care to follow them? The influence of the Enlightenment upon the definition and purpose of Natural Law tended to put great confidence in ***human reason***, and conversely, a low evaluation of the Bible (Revealed Law). This led academia to a promotion of an ***autonomous human ethic***. Modernity seems to have accepted this position in academia. But did Reformed Theology put restrictions on the definition and purpose of Natural Law, insisting on a close relationship with the Scriptures (Revealed Law), which referred to ***Absolute Values*** flowing from a Transcendent and Holy God, as the only valid source of Ethics? Is man autonomous, and allowed to swirl around in the ocean of relativistic morals based on the Enlightenment's definition of values/ethics. Or did/does Reformed Theology provide---and insist upon---a North Star of unchanging Absolute Values drawn from a Revealed Law (Scriptures)?