--> Figure 16

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Figure 16. Saturated vs. aromatic hydrocarbons. C13 aromatic versus saturated hydrocarbons plot shows the oil from the Covenant field is geochemically different from the well-known Phosphoria source of Rangely field, Colorado, the Cretaceous source of fields in northeastern Utah, and the mixed Cretaceous-Phosphoria source of Ashley Valley field in eastern Utah. The age of the oil is likely Mississippian.