A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM

<table>Thin section photomicrographs of lithofacies 1. (a) x50ppl, 1st (Dol 1) and 2nd (Dol 2) generation replacement dolomite, scattered monocrystalline quartz (Qtz), unloading fracture (Unl frac), and intercrystalline porosity (Ix1); (b) x100ppl; (c) x200ppl hematite (Hem) occluding pores and as microblebs replacing Dol 1 and Dol 2 rhombs; (d) x400ppl, dissolution microvugs (mV) and clast rimmed with Dol 3 crystals.</table>

Journal of Geological Research

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Figure 3: A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM 

Figure 3 | A Petrographic Study of the Three Forks Formation (Upper Devonian), Williston Basin, North Dakota: Based on Thin Section Analysis, XRD and SEM 