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The Hartville uplift is a north-northeasttrending Laramide anticline on the southeast margin of the Archean Wyoming craton. It consists of a Precambrian core (fig. 1) overlain by partly eroded gently outward-dipping Paleozoic strata and, locally, by flat-lying Tertiary and Quaternary strata. The uplift is the easternmost Laramide structure on the Wyoming craton. The uplift exposes deformed Late Archean granite (2.58 Ga) and Late Archean or Early Proterozoic supracrustal rocks that were deformed during three, and possibly four, major compressional events in Early Proterozoic time, extending from approximately 2.1 to 1. 76 Ga. These events are recorded in the Guernsey and Casebier Hill quadrangles by (1) inversion of supracrustal succession (D1) as a result of a probable fold nappe; (2) folding of rocks at least in the southern part of uplift on east-west axes {Dz ); (3) west-vergent folding on northeasttrending axes and associated thick-skinned thrusting with concomitant prograde metamorphism; and (4) scattered horizontal folds and associated structures in the extreme southern part of the area. The overturned succession probably constitutes the lower limb of a fold nappe (D1), which could have formed as an early phase of deformation Dz . The Dz folds apparently were caused by north-vergent collision {approximately 2.1 Ga) along the southern margin of the Wyoming craton. The main, most widespread deformation in the uplift (D3; approximately 1.82 Ga) constitutes a west-vergent fold-thrust belt on the western, convergent continental margin of the Trans-Hudson orogen (Lewry and Stauffer, 1990); the continent-arc suture is not exposed but is inferred to lie a few kilometers to the east of the uplift. The youngest recognized significant deformation (D 4), 1997

Geologic map of Precambrian rocks along part of the Hartville uplift, Guernsey and Casebier Hill quadrangles, Platte and Goshen Counties, Wyoming