The Bighorn River has carved a canyon through the structure perpendicular to the fold axis. Shown above is a railroad cut that runs through this northwest-southeast trending anticline. Geology of Sheep Canyon Quadrangle: Wyoming is the second such detailed investigation by graduate students at Iowa State University. School has begun, which means that I will have less time to go to the field. 0000001292 00000 n The surface sedimentary rock formations that are exposed in the fold, range in age from 66-360 million years. Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Comb Ridge is the abrupt eastern flank of the Monument Upwarp. Fracture controlled pale-ohydrogeology in a basement-cored, fault-related fold: Sheep Mountain Anticline, Wyoming, United States. 0000000696 00000 n Introduction Sheep Mountain Anticline is located on the northwest flank of the Bighorn Basin, west of the Bighorn Mountains (Figure 1). 0000005465 00000 n Jeff Hennier, John H. Spang. The large fold seen in the sedimentary rocks at Sheep Mountain was created by crystalline basement rock uplifted along faults that parallel the long axis of the structure along the steeper east flank. The Ancestral Bighorn River established a course over the landscape while the anticline was still buried at depth. Near Greybull, Wyoming is a long ridge called Sheep Mountain. In order to unravel the history of strain during folding, we carried out combined anisotropy of magnetic susceptibility (AMS), anisotropy of P ‐wave velocity (APWV) and Fry strain analyses. Image credit: Wikipedia commons. %%EOF An example of an anticline is shown in the map below. Modeling studies point to the influence of the elastic stress perturbations induced by slip along the underlying faults on this fracturing. Wednesday, August 28, 2013. 234 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1916, PART II. 234 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1916, PART II. Map 1: This structure is the Sheep Mountain anticline in Wyoming. The field data gathered then form the basis for a paper titled: "Geologic History of the Sheep Mountain Region". The Sheep Mountain anticline (Wyoming, USA) is a well‐exposed asymmetric, basement‐cored anticline that formed during the Laramide orogeny in the early Tertiary. Recent field studies at Sheep Mountain Anticline, a Laramide fold on the eastern flank of the Bighorn Basin in Wyoming, constrain the fold kinematics using the fracture pattern mapped across the fold. Photo by Bernhard Edmaier #patterns #geology This analysis demonstrates that the growth of Sheep Mountain anticline induces a brutal release of 15Mpa of overpressure accumulated before folding during layer parallel shortening. Photographer: Ryan Miller Summary Author: Ryan Miller The Sheep Mountain anticline, in the Bighorn Basin of Wyoming, formed during the Laramide orogeny. Sheep Mountain Anticline, located on the eastern edge of the Bighorn Basin, Wyoming, is a well known NW–SE trending, asymmetric Laramide fold (Fig. Observations of shearing also constrain spatial and temporal variations of the stress state across the anticline during folding. Field observations of sheared fractures and bedding planes in various structural locations across Sheep Mountain Anticline, Wyoming, document the role of fracture reactivation and flexural slip in folding related deformation. An anticline is a geologic formation where the strata slope downward on either side of a crest, and this particular mountain is one of the more famous examples of this kind of … Fold geometry at Sheep Mountain anticline, Wyoming, constructed using airborne laser swath mapping data, outcrop-scale geologic mapping, and numerical interpolation JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH Lovely, P., Zahasky, C., Pollard, D. D. 2010; 115 As Sheep Mountain is a topographic high and barrier to streamflow, how was the river able to establish itself and eventually erode through the anticline? in the Bighorn Basin, Wyoming . 0000008787 00000 n D�i��0�%����������� ����. 0000006560 00000 n The Mowry shale crops out in a SE-plunging syncline at the right. However, if a fold grows laterally along its axis, early-formed fold-related joints may differ significantly in orientation from joints that form later. GEOL 102 Historical Geology. startxref The role of fractures in the structural interpretation of Sheep Mountain Anticline, Wyoming. The faults and associated fold both trend in a northwest to southeast direction for … The Sheep Mountain anticline (Wyoming, USA) is a well‐exposed asymmetric, basement‐cored anticline that formed during the Laramide orogeny in the early Tertiary. The field data gathered then form the basis for a paper titled: "Geologic History of the Sheep Mountain Region". GigaPan Stitch version … An investigation into the role of fault interaction on fold pattern, Journal of Structural Geology, vol. google_ad_width = 200; It is 15 miles long and the involved rock formations, which were originally horizontal, have been bent and uplifted over 1000 feet. Geology of Sheep Canyon Quadrangle: Wyoming is the second such detailed investigation by graduate students at Iowa State University. Image credit: Wikipedia commons. The fold is cut by the Bighorn River perpendicular to the fold hinge, providing excellent exposure of Upper Paleozoic strata in the core of the fold. Many of the ranges that form the Rocky Mountains also took shape at this time. Typical anticline. Spring Semester 2020 Lithostratigraphy. An anticline is a geologic formation where the strata slope downward on either side of a crest, and this particular mountain is one of the more famous examples of this kind of formation. Geology Of the Bighorn Basin; 34th Annual Field Conference Guidebook, 1983 Pages 96-111. //-->, Earth Science Picture of the Day is a service of, Earth Science World Image Bank: Sheep Mountain Anticline, A Virtual Field Trip to the Virgin Anticline, North Antelope Rochelle Coal Mine, Wyoming. Near Greybull, Wyoming is a long ridge called Sheep Mountain. The white Muddy sand of the black Thermopolis shale appears at the center of view and bends around the nose of the anticline to extend along strike at the left. The Gigapan Comments (0) Toggle Minimize gigapan_comment. School has begun, which means that I will have less time to go to the field. anticline n. Geology A fold with strata sloping downward on both sides from a common crest. Poles to bedding are heavy circles. The Sheep Mountain anticline (Wyoming, USA) is a well-exposed asymmetric, basement-cored anticline that formed during the Laramide orogeny in the early Tertiary. 2004. google_ad_slot = "7812802037"; Geometry of Sheep Mountain Anticline Sheep Mountain Anticline is a basement‐cored, doubly plunging, asymmetric fold (Figures 1 and 3). The Sheep Mountain anticline plunges to the northwest. 0000011791 00000 n The eventual goal is complete geologic map coverage of Sheep Mountain Anticline. google_ad_client = "pub-1182166660032404"; Where in the World is this GigaPan? Little Sheep Mountain Anticline - Fracture Analysis Graduate thesis research pertaining to fracture analysis of the Little Sheep Mountain Anticline. This summer two of my sons and I took a hike through the Jurassic time period. The Mowry shale crops out in a SE-plunging syncline at the right. In the case of sheep mountain imagine that the area around the center of this image is eroded leaving a peak where the folded rocks are bent up. An anticline is an upward, curved fold in the layers of rock in the earth's surface. Field mapping of Sheep Mountain and … Joint patterns at Sheep Mountain Anticline, WY, USA, indicate that this structure grew laterally. Dec 4, 2013 - Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. 0000000927 00000 n The lower unit of the Gypsum Spring Formation is interbedded shale and gypsum. In this paper, we integrate mechanical stratigraphy 0000007620 00000 n " Compressional forces during the Laramide mountain-building event (40–70 million years ago) uplifted an area of southeast Utah known as the Monument Upwarp. Sheep Mountain Anticline Joint pattern Mechanical stratigraphy Plate bending abstract Despite how common folds are as structural features, along-strike fold propagation has proven elusive to document. Shown above is a railroad cut that runs through this northwest-southeast trending anticline. %PDF-1.4 %���� Sheep Mountain Anticline: Backlimb Tightening and Sequential Deformation. Mechanisms for Deformation of Sedimentary Strata at Sheep Mountain Anticline, Bighorn Basin, Wyoming . x�b```"ѷ� �a�sddZ���z�� Y& � �Xd�c����w�'��.�|`�� Name: _____ _ The image above features a slightly off-axis view of the NW-plunging nose of the Sheep Mountain anticline (44.642°N, 1 OB.186°W) in the Bighorn Basin of Wyoming (left side of image). It is a basement-cored thrust-fault related fold of Laramide age. 26, pp 905-917. It is a basement-cored thrust fault–related fold that formed in response to Laramide tectonics. The blue line down the center of the fold represents the axial trace, or the line that separates the two dipping limbs of the fold. - "The role of fractures in the structural interpretation of Sheep Mountain Anticline, Wyoming" Fig. The Ancestral Bighorn River established a course over the landscape while the anticline was still buried at depth. The fracture pattern is interpreted to identify five main fracture sets. Sheep Mountain Anticline Joint pattern Mechanical stratigraphy Plate bending abstract Despite how common folds are as structural features, along-strike fold propagation has proven elusive to document. by impervious shale and within reach of the drill in folds favorable for the accumulation of oil and gas. 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