Definitions for "Ashlock"
Formation originated for use during the Kentucky geological mapping program. Used in south-central Kentucky, and includes the following members in ascending order: Tate (C2 peritidal), Gilbert (C3 lagoonal), Stingy Creek (C3 shallow subtidal), Terrill (C3 peritidal), Sunset (C4 lagoonal), Reba (C4 shallow subtidal). Many of these members are thin, so the Ashlock Formation is convenient for mapping these as a single unit, but not very useful for paleoenvironmental or sequence stratigraphic interpretation. The Ashlock overlies the Calloway Creek Formation and is overlain by the Drakes Formation.