Orthodox Period Divisions
...the span of the post-Reformation era can be divided into four somewhat vaguely defined periods: early orthodoxy, in two phases (ca. 1565-1618-1640), one leading toward, the other following the Synod of Dort; high orthodoxy, also in two phases (ca. 1640-1685-1725), the former developing the orthodoxy of the confessions in considerable detail both positive and polemical, the latter phase characterized by deconfessionalization and transition; and late orthodoxy (ca. 1725-1770).
Richard Muller, After Calvin: Studies in the Development of a Theological Tradition (Oxford University Press: New York, 2003), pg 4