The Hyrum And Beirdneau Formations Of North Central Utah And Southeastern Idaho PDF Download

The Hyrum and Beirdneau Formations of North-central Utah and vi Southeastern Idaho represent rocks of late Middle Devonian (Givetian) to upper Upper Devonian (Famennian) age. They are disconformably underlain by the Early Devonian Water Canyon Formation in most cases and disconformably overlain by the Devonian-Mississippian Leatham Formation or the Mississippian Lodgepole Formation. The Hyrum Formation is divided into five members based on lithology and color changes. The five members are: (1) Samaria, (2) Lower Dolomite, (3) Lower Carbonate-detritus, (4) Upper Dolomite, and (5) Upper Carbonate-detritus Members. The Samaria Member is the only fossiliferous unit within the Hyrum Formation. The Beirdneau Formation is divided into three members based on lithology and color cha~ges. These three members Sre: (1) Lower Carbonate, (2) Sandstone, and (3) Upper Carbonate Members. This Formation represents deposition in a shallow water and a restricted sea environment.