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intervals are, from stratigraphically lowest to highest, the Rainey, Lytle, Kirby Lake, and Standpipe Limestones. The composition and appearance of these limestones can be variable, with some localities having fine-grained layers and others being practically marine conglomerate. These four limestone layers do not persist in the entirety of the "Southern Area", with the Standpipe Limestone terminating just north of Abilene. This makes it difficult to distinguish the boundary between the Arroyo and Vale Formation

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