GEO 4510 F
IELD
G
EOLOGY
(S
UMMER
F
IELD
C
AMP
), 2014
C AMP P LAN AND I NFORMATION , P ROJECT 2; R AFT R IVER M OUNTAINS
S CHEDULE ( subject to change owing to weather, other unforeseen complications):
9:15 AM, Friday, May 23 Leave from Sutton loading dock
May 23 – June 2
Monday, June 2
June 3 – 9
Mapping Project 2 (Raft River Range; northern UT)
Final mapping, pack up camp; return to SLC
Write Project 2 report; due 6 PM, Monday, June 9
P ROFESSOR : David A. Dinter , FASB 321, 801-581-7937, david.dinter@utah.edu
G RADUATE T EACHING A SSISTANT : Jelle Wiersma, FASB 365, wiersma.jelle.p@gmail.com
U NDERGRAD TA S /C AMP M ANAGERS : Mallory Millington and Amy Steimke
• F IRST DAY LOGISTICS (F RIDAY , M AY 23, 2014):
8:45 AM Meet at FASB loading dock ( Bring a bag lunch!
)
9:15 AM
~ 11:45 AM
Leave for the Raft Rivers
All vehicles rendezvous at Flying J Truck Stop, Snowville, UT.
(Fill UU vehicles with gas around the corner at state fuel station.)
~1:00 PM
1:00 - 3:00 PM
Arrive Elaine & Ron's place, Park Valley
Set up camp (Help unload & organize communal gear if requested)
3:00 - 6:00 PM Introductory field trip (weather-permitting), including world-class stretched pebble conglomerate at base of Elba Quartzite
6:00 - 7:00 PM
7:00 - 8:00 PM
Cooking group makes customary gourmet dinner
Dinner and cleanup
Weather : It has been known to rain, snow, hail, and occasionally sleet in the Raft Rivers in the late spring/early summer. Pack accordingly. Interesting weather can arrive quickly and unexpectedly, so you’d be well advised to carry rain gear and a warm outer layer every day .
Evenings, showers, etc.
: It is ~38 miles to Snowville and you have to pay for showers at the truck stop, so evening trips for showers or shopping are a poor option. Towns in Idaho are even further, so plan accordingly (i.e., bring what you need – snacks, drinks, a solar shower, maybe).
• If it’s your cooking/cleanup night, you are responsible to be in camp helping your group with these activities for as long as they take, from beginning to end.
• There will be intermittent discussions in the evenings as need dictates, and you will also want to ink and color your maps and work on your notes, stereonets, etc. after dinner most nights.
Directions to Elaine & Ron's 40 acres of paradise on the outskirts of Park Valley (our campsite) :
Take I-15 north to junction with I-84. Take I-84 northwest to Highway 30 exit (~3 miles past
Snowville). Take Hwy. 30 ~15.3 miles due west to junction with Hwy. 42. Do NOT continue straight forward on Hwy. 42.
Instead, turn left, which puts you on the continuation of Hwy. 30. Drive about another 17.8 miles, until you find Mile Marker 57. (If you get to the tiny cluster of ranch houses called
"Park Valley", you've gone about 2 miles too far.) Just west of Mile Marker 57, turn left (south) onto a ranch road. Go through the green double gate and drive 1.1 miles, staying to the left at the major fork.
(The local ranchers often put up barbed-wire gates across this stretch; always leave them as you found them - either opened or closed.) On the left, you'll find another green double gate with signs reading
"J&S Price" and "Juniper". Go through those and drive north 1/3 mile to the trailer and yard.
Elevation = 5535 feet.

GEO 4510; Summer Field Geology – Project 2; M
AY
23 – J
UNE
9, 2014
G
EOLOGY OF THE
R
AFT
R
IVER
M
ETAMORPHIC
C
ORE COMPLEX
, UT
In Parowan Gap you mapped unmetamorphosed Mesozoic to Tertiary rocks, many of which
(Straight Cliffs, Iron Springs, Grand Castle, and Claron Formations) were deposited in the foredeep basin near the eastern margin of Sevier thrusting. In the Raft River Mountains you will map
Precambrian and Paleozoic rocks that represent the western margin of North America prior to the final assembly of Pangaea in Triassic time. The Raft Rivers lie paleogeographically west of Parowan Gap in the hinterland of the Sevier fold-and-thrust belt. The “hinterland” is the region “behind” (west of) the eastern limit of Sevier thrusting, within the thrust belt itself, where Precambrian to Mesozoic continental margin strata were shortened and thickened along mainly east-vergent (top-to-the-east) thrusts. Sevier deformation lasted from ~130 to 60 Ma, and was diachronous (affected different areas of western North America at different times). Sevier thrust sheets (“allochthons”) were the source of conglomerate clasts in the Straight Cliffs, Parowan Gap, Grand Castle, and Claron Formations exposed in the Red Hills. In the Raft River Mountains, you will map Precambrian and Paleozoic quartzites and carbonates that correlate with the source rocks of the Grand Castle and Claron conglomerate clasts.
Mesozoic sedimentation and Sevier thrusting deeply buried Precambrian-Paleozoic rocks in northwestern Utah, resulting in regional amphibolite-facies metamorphism in the deepest parts of the section and greenschist-facies metamorphism at higher crustal levels. These metamorphic rocks were partially exhumed in Cretaceous time by extensional faulting coeval with Sevier thrusting.
Simultaneous compressional deformation (thrusting) and extension (normal-faulting) in an active thrust belt may seem counterintuitive, but has been recognized in most active and inactive continental compressional orogens on Earth, including the Alps, Himalayas, Scandinavian Caledonides, and the
North American Cordillera. Synorogenic extension commonly occurs because the crust in continental thrust belts becomes “overthickened” to the point that it is gravitationally unstable. Upper parts of the orogen then begin to “collapse” or spread under extension even as thrusting continues at deeper levels.
You will map Sevier thrusts and synorogenic normal faults in the Raft Rivers, but the predominant structures exposed (responsible for the range’s present morphology) are products of Basin-and-Range extension, primarily early Miocene in age. They are components of a low-angle normal-fault system that accommodated as much as 100% extension in northwest Utah, resulting in the relatively rapid exhumation of a metamorphic “core” from crustal depths greater than 12-15 km. In emerging from these depths, the footwall or “core” rocks passed upward through the brittle-ductile transition in the crust during deformation. Thus, in the footwall rocks, ductile structures and textures (mylonites, ductile folds, and stretching lineations) are overprinted by brittle features (fault breccia, high-level subsidiary faults) that represent a later phase of the same extensional event. Along the main (top-tothe-east) Raft River detachment (the low-angle normal fault), amphibolite-facies metamorphic core rocks are juxtaposed beneath weakly metamorphosed, brittly deformed Precambrian-Paleozoic sedimentary rocks in the hanging wall. On the order of 10 kilometers of crust is “missing” between the hanging wall and the footwall, cut out by extensional displacement on the Raft River detachment.
Rocks correlative with the excised section can be observed east of the Raft Rivers in the Black Pine
Range.
In this project, you will map an ~4 mi 2 area on the south flank of the Raft Rivers that includes the main extensional Raft River detachment, mylonites, folds, faults, and other extensional structures in its metamorphic footwall, and severely deformed hanging-wall rocks. You will understand what extensional core complexes are all about by the time you finish.

T ENTATIVE M AP UNITS , S OUTHEASTERN R AFT R IVER M OUNTAINS , UT M AP C OLORS
Qal Modern alluvium Silty sand and gravel Yellow
Qls Landslide deposits Unsorted silty, sandy sedimentary breccia Dark yellow
U PPER PLATE ROCKS ( THE HANGING WALL )
Poq Oquirrh Formation Pennsylvanian-Permian, includes, from top: fine-grained calcareous sandstone and orthoquartzite, gray sandy limestone, calcite
Light blue and dolomite marble
Mcdp Chainman/Diamond Dark phyllite or shale
Peak Formation
Violet
Ofh Fish Haven Dolomite Gray laminated dolomite, tan dolomite Green
Oe Eureka Quartzite Thin-bedded white quartzite, locally brecciated Red
Op Pogonip Group Mica-calcite marble, dolomite marble, phyllite Lavender pCtm T ECTONIC MELANGE Orange
May include (among others; describe what you see):
Cmp Schist of Mahogany Peaks Staurolite-garnet-biotite schist
Ccb Unknown quartzite (Quartzite of Clarks Basin?) pCss Schist of Stevens Spring Quartz-muscovite schist with phyllite lenses, hornblende schist layers
L OWER PLATE ( THE METAMORPHIC CORE ) pCug Schist of the Upper Narrows
Lower member Biotitic and feldspathic fine-grained gneiss and schist pCe Elba Quartzite
Gray pCeq Quartzite member White, tan to green quartzite, muscovite schist pCes Schist member Fine-grained, laminated, mica-feldspar-qtz schist
Light peach
Brown
2.5 billion-year-old crystalline basement rocks we will see, but not map
(include in rock descriptions) pCad Metamorphosed adamellite (quartz monzonite) pCt Trondhjemite/ White gneissose to pegamatitic quartz, white mica,
Metapegmatite and plagioclase, intrusive rocks pCmi Mafic igneous Dark hornblende/biotite schist and amphibolite pCos Older schist Fine mica-feldspar-quartz schist. Relict stretched pebbles from unsorted pebbly mudstone.

Mapping Groups – Raft River Project, 2014
Group A:
Group B:
Group C:
Group D:
Group E:
Group F:
Group G:
Group H:
C AMP I NFORMATION AND P ROCEDURES – R AFT R IVER P ROJECT
• A positive attitude and willingness to pitch in with camp chores is essential for the success of the course and to assure an enjoyable, productive field experience. The camp managers can’t take care of everything, so please help whenever necessary. 10% of your grade (enough to raise or lower your grade by one full letter) will be awarded for professionalism in the field , including attitude, participation, doing your share of the work in camp, and being on time .
• There are rattlesnakes in the Raft River Mountains, so watch your step. Also, ticks are not unknown, so be sure to check yourself for them after every day in the field. Maybe you will be the one to top the current UU Summer Field Camp record of seven in one day . Good luck!
• S howers and shopping : It is 38 miles to the truck stop in Snowville, so evening trips for showers or shopping are a poor option. Towns in Idaho are even further, so plan accordingly (i.e., bring what you need – a solar shower, maybe).
• Evenings : There will be discussions in the evenings as need dictates, and you will also want to ink and color your maps and work on your notes, stereonets, etc. after dinner most nights.
• Cooking and cleanup will be the same as at Parowan. Breakfast is at 7:15 A.M.
, and you will make yourself a bag lunch after breakfast each morning to eat in the field. We leave camp for the field area promptly at 8:00 A.M.
Cooking/clean-up groups - Raft Rivers (almost the same as at Parowan)
Group 1:
Group 2:
Group 3:
Group 4:
Group 5:
Group 6:
Cooking/cleanup schedule (dinner on the day listed; breakfast the following morning):
Friday, May 23 Group 1
Saturday, May 24 Group 2
Wednesday, May 29 Group 1
Thursday, May 30 Group 2
Thursday, May 25 Group 3
Friday, May 26 Group 4
Saturday, May 27 Group 5
Sunday, May 28 Group 6
Friday, May 31
Saturday, June 1
Group 3
Group 4
Sunday, June 2 Group 5
(with plenty of help from friends)

• Coverage and completeness (area, sufficient attitudes, etc.)
• Accuracy (contact locations, unit thicknesses, etc.)
• Legend (unit and symbol explanations, scale bar, lat/long, etc.)
• Presentation (neatness, professionalism)
/07
/12
/03
/03
Subtotal: /25
• Accuracy (dips, thicknesses) and consistency with map
• Interpretation; geologic and geometric viability
• Topography, scales, unit labels, legend, etc.
• Presentation (neatness, professionalism)
• Descriptions (accuracy and completeness)
• Required elements (ages, unit names, thicknesses, graphics)
• Presentation (neatness, professionalism)
/05
/05
/03
/02
Subtotal: /15
/05
/03
/02
Subtotal: /10
• Abstract and conclusions (completeness, accuracy)
• Introduction (statement of problem)
• Geologic setting
• Rock descriptions and depositional environments
• Structure and geologic history
• Figures (quality, utility, appropriateness)
• Stereonets
• Language usage and required elements (refs., fig. captions, etc.)
/12
/05
/05
/05
/05
/04
/05
/09
Subtotal: /50

Reference list for field library:
Compton, R.R., 1983, Displaced Miocene rocks on the west flank of the Raft River–Grouse Creek core complex, Utah. Geological Society of America Memoir 157, p. 271-279.
Compton, R.R. et al., 1977, Oligocene and Miocene metamorphism, folding, and low-angle faulting in northwestern Utah, Geological Society of America Bulletin, v. 88, p. 1237-1250.
Compton, R.R. & Todd, V.R., Reply, Geological Society of America Bulletin, Part I, v. 90, p. 307-309.
Covington, H.R., 1983, Structural evolution of the Raft River Basin, Idaho. Geological Society of
America Memoir 157, p. 229 - 237.
Crittenden, Jr., M.D., 1979, Oligocene and Miocene metamorphism, folding, and low-angle faulting in northwestern Utah: Discussion. Geological Society of America Bulletin, Part I, v. 90, p. 305-306.
Davis, G.H., 1983, Shear-zone model for the origin of metamorphic core complexes. Geology, v. 11, p.
342-347.
Jordan, T.E., 1983, Structural geometry and sequence, Bovine Mountain, northwestern Utah.
Geological Society of America Memoir 157, p. 215-227.
Lister, G.S., and Snoke, A.W., 1984, S-C Myonites. Journal of Structural Geology, vol. 6, no. 6, p.
617-638.
Manning, A., and Bartley, J. M., 1994, Postmylonitic deformation in the Raft River metamorphic core complex, northwestern Utah: Evidence of a rolling hinge. Tectonics, vol. 13, no. 2, p. 596-612.
Reynolds, S.J., and Lister, G.S., 1990, Folding of mylonitic zones in Cordilleran metamorphic core complexes: Evidence from near the myonitic front, Geology, v. 18, p. 216-219.
Todd, V.R., 1983, Late Miocene displacement of Pre-Tertiary and Tertiary rocks in the Matlin
Mountains, northwestern Utah, Geological Society of America Memoir 157, p. 239-270.
Wernicke, B., and Burchfiel, B. C., 1982, Modes of extensional tectonics. Journal of Structural
Geology, vol. 4, no. 2, p. 105-115.
Hoisch-Thomas-D; Hanson-Lori-M; Wells-Michael-L, 1998, Pressure-temperature paths from garnetzoning; evidence for rapid thrust burial in the hinterland of the Sevier orogenic belt. In: Geological
Society of America, 1998 annual meeting. Abstracts with Programs - Geological Society of America.
30; 7, Pages 73. 1998. Geological Society of America (GSA). Boulder, CO, United States. 1998.
Wells-M-L; Struthers-J-S; Snee-L-W; Walker-J-D; Blythe-A-E; Miller-D-M, 1997, Miocene extensional reactivation of an Eocene extensional shear zone, Grouse Creek Mountains, Utah. In:
Geological Society of America, 1997 annual meeting. Abstracts with Programs - Geological Society of America. 29; 6, Pages 162. 1997. Geological Society of America (GSA). Boulder, CO, United
States. 1997.

Wells-Michael-L; Hoisch-Thomas-D; Peters-Mark-T; Miller-David-M; Wolff-Evan-D; Hanson-Lori-
M, 1998, The Mahogany Peaks Fault, a Late Cretaceous-Paleocene(?) normal fault in the hinterland of the Sevier Orogen, Journal of Geology. 106; 5, p. 623-634.
ABSTRACT: The contact separating Ordovician rocks from the underlying lower part of the Raft
River Mountains sequence, northwestern Utah, is reinterpreted as a large-displacement low-angle normal fault, the Mahogany Peaks fault, that excised 4-5 km of structural section. High delta 13 C values identified in marble in the lower part of the Raft River Mountains sequence suggest a
Proterozoic, rather than Cambrian age. Metamorphic conditions of hanging wall Ordovician and footwall Proterozoic strata are upper greenschist and middle amphibolite facies, respectively, and quantitative geothermometry indicates a temperature discontinuity of about 100°C. A discordance in muscovite 40 Ar/ 39 Ar cooling ages between hanging wall and footwall strata in eastern exposures, and the lack of a corresponding cooling age discordance in western exposures, suggest a component of west dip for the fault. The juxtaposition of younger over older and colder over hotter rocks, the muscovite cooling age discordance with older over younger, and top-to-the-west shearing downstructure are consistent with an extensional origin. The age of faulting is bracketed between 90 and 47
Ma, and may be synchronous with footwall cooling at about 60-70 Ma. Recognition of the Mahogany
Peaks fault, its extensional origin, and its probable latest Cretaceous to Paleocene age provides further evidence that episodes of extension at mid-crustal levels in the hinterland of the Sevier orogenic belt were synchronous with protracted shortening in the foreland fold and thrust belt, and that the Sevier orogen acted as a dynamic orogenic wedge.
Wells-Michael-L; Hoisch-Thomas-D; Hanson-Lori-M; Wolff-Evan-D; Struthers-James-R., 1997,
Large magnitude crustal thickening and repeated extensional exhumation in the Raft River, Grouse
Creek, and Albion Mountains. In: Proterozoic to recent stratigraphy, tectonics, and volcanology, Utah,
Nevada, southern Idaho and central Mexico. Link-Paul-Karl (editor); Kowallis-Bart-J (editor);
Geology Studies. 42, Part 1; Pages 325-340. 1997. Brigham Young University, Department of
Geology. Provo, UT, United States. 1997.
Hoisch-T-D; Wells-M-L; Wolff-E-D, 1997, Two-dimensional thermal models of detachment faulting with application to the Raft River detachment in Northwest Utah. In: Geological Society of America,
1997 annual meeting. Abstracts with Programs - Geological Society of America. 29; 6, Pages 381.
1997. Geological Society of America (GSA). Boulder, CO, United States. 1997.
Wells, M. L., 1997, Alternating contraction and extension in the hinterlands of orogenic belts; an example from the Raft River Mountains, Utah, Geological Society of America Bulletin, v. 109; 1, p.
107-126.
ABSTRACT: Combined macroscopic to microscopic structural analyses, detailed geologic mapping, and thermochronology were used to study the structural evolution of midcrustal rocks of the Sevier orogenic belt hinterland in northwestern Utah. These results, when combined with previous studies, provide new insight into the structural history of this region, and suggest alternating tectonic contraction and extension during Mesozoic to early Cenozoic time. Two allochthons form the upper plate of the Miocene Raft River detachment fault in the eastern Raft River Mountains. The lower

allochthon comprises Neoproterozoic, Ordovician, and Pennsylvanian(?) strata, and is bounded below by the Raft River detachment fault and above by the middle detachment fault. Strata within the lower allochthon were dramatically attenuated by two episodes of ductile deformation. The first deformation
(D
1
) took place at metamorphic temperatures of nearly 500°C, and resulted in penetrative fabrics throughout these rocks that record combined flattening and top-to-northeast shearing strains. The second deformation (D2) resulted in significant stratigraphic attenuation along discrete top-to-the-west shear zones that are generally parallel to lithologic contacts. Separates of synkinematic muscovite from the penetrative fabric yield 40 Ar/ 39 Ar cooling ages that indicate that D1 deformation occurred prior to cooling ca. 90 Ma. Both fabrics were subsequently folded about (D3) kilometer-scale recumbent folds.
The areally extensive middle allochthon, composed chiefly of Pennsylvanian and Permian rocks metamorphosed in the greenschist facies, was emplaced (D4) along the low-angle middle detachment fault. This fault cuts across various structural levels of the recumbently folded lower allochthon in its footwall, and juxtaposes greenschist facies over amphibolite-facies metamorphic rocks. The lower and middle allochthon were subsequently deformed (D5) into open folds with north-trending axes.
Neogene extension (D6) produced a nearly 200-m-thick top-to-east ductile shear zone in Precambrian rocks, and formed the younger Raft River detachment fault, which forms the present upper contact of the ductile shear zone. Northeast-vergent D1 fabrics probably record shortening deformation, on the basis of fabric correlations with the Grouse Creek and Albion mountains, deformation kinematics, and synkinematic prograde metamorphism. D2 attenuation faults have been interpreted to record crustal extension of Late Cretaceous age. If D3 recumbent folds developed during extension, then the deformation sequence records early shortening followed by protracted extensional unroofing with variable structural styles. The favored alternative is that D3 recumbent folds developed during shortening; in this case, D
1
through D4 record episodic alternations of contraction and extension. Such alternations are consistent with observations from analog and theoretical models of contractional mountain belts and suggest that the hinterland of the Sevier orogenic belt underwent dynamic adjustments in crustal thickness and deformation kinematics in response to changes in the boundary conditions of the orogenic belt.
Wells-M-L, 1992, Mesozoic and Cenozoic(?) deformations in the Black Pine and Raft River
Mountains, southern Idaho and northwestern Utah. In: Geological Society of America, Rocky
Mountain Section and associated societies, 45th annual meeting; abstracts with programs. Ash-
Sidney-R (chairperson) Abstracts with Programs - Geological Society of America. 24; 6, Pages 68.
1992. Geological Society of America (GSA). Boulder, CO, United States. 1992.
Wells-Michael-L, 1992, Kinematics and timing of sequential deformations in the eastern Raft River
Mountains. In: Field guide to geologic excursions in Utah and adjacent areas of Nevada, Idaho, and
Wyoming. Wilson-James-R (editor). Miscellaneous Publication - Utah Geological Survey. 92-3;
Pages 58-78. 1992. Utah Geological Survey. Salt Lake City, UT, United States. 1992.
Wells-Michael-L, 1991, Episodic Mesozoic/ early Cenozoic contraction and extension in the
Cordilleran hinterland, Raft River Mountains, northwestern Utah. In: Geological Society of America,
1991 annual meeting. Abstracts with Programs - Geological Society of America. 23; 5, Pages 131.
1991. Geological Society of America (GSA). Boulder, CO, United States. 1991.
Wells-Michael-L; Allmendinger-Richard-W, 1990, An early history of pure shear in the upper plate of the Raft River metamorphic core complex; Black Pine Mountains, southern Idaho. Journal of
Structural Geology. 12; 7, Pages 851-867. 1990. Pergamon. Oxford-New York, International.

Wells-Michael-L; Dallmeyer-R-David; Allmendinger-Richard-W, 1990, Late Cretaceous extension in the hinterland of the Sevier thrust belt, northwestern Utah and southern Idaho; with Suppl. Data 90-20.
Geology (Boulder). 18; 10, Pages 929-933. 1990. Geological Society of America (GSA).
Wells-Michael-L; Dallmeyer-R-D; Allmendinger-Richard-W, 1990, Late Cretaceous extension in the
Sevier Belt hinterland, Raft River and Black Pine Mountains, Northwest Utah and southern Idaho. In:
Geological Society of America, Cordilleran Section, 86th annual meeting. Zoback-Mary-Lou
(chairperson); Rowland-Stephen-M (chairperson) Abstracts with Programs - Geological Society of
America. 22; 3, Pages 93. 1990.
Wells-Michael-L; Dallmeyer-R-D; Allmendinger-Richard-W, 1989, Sequential Mesozoic thermal events in upper plate rocks of the Raft River core complex, Northwest Utah and southern Idaho. In:
Geological Society of America, Cordilleran Section, 85th annual meeting and Rocky Mountain
Section, 42nd annual meeting. Abstracts with Programs - Geological Society of America. 21; 5, Pages
157. 1989. Geological Society of America (GSA). Boulder, CO, United States. 1989.
Wells-Michael-L; Allmendinger-Richard-W, 1987, Superposition of pure and simple shear in the cover rocks of the metamorphic core complexes, Black Pine Mountains, southern Idaho. In: Geological
Society of America, 1987 annual meeting and exposition. Dickinson-William-R (chairperson)
Abstracts with Programs - Geological Society of America. 19; 7, Pages 886. 1987. Geological Society of America (GSA). Boulder, CO, United States. 1987.
Wells-M-L; Miller-D-M, 1996, Neoproterozoic age for the lower part of the Raft River Sequence; implications for Mesozoic evolution of the Sevier Belt hinterland. In: Geological Society of America,
Cordilleran Section, 92nd annual meeting. Abstracts with Programs - Geological Society of America.
28; 5, Pages 122. 1996. Geological Society of America (GSA). Boulder, CO, United States. 1996.
Wells-Michael-L; Struthers-James-R, 1995, Influence of rheological contrasts on mid-crustal extensional shear zone geometry. In: Geological Society of America, 1995 annual meeting. Abstracts with Programs - Geological Society of America. 27; 6, Pages 283. 1995. Geological Society of
America (GSA). Boulder, CO, United States. 1995.
Wells-Michael-L; Snee-Lawrence; Blythe-Ann-E. 1994, Mesozoic and Cenozoic extensional history of the northeastern Great Basin; insights from the Raft River, and Grouse Creek Mountains. In:
Geological Society of America, Cordilleran Section, 90th annual meeting. Abstracts with Programs -
Geological Society of America. 26; 2, Pages 103. 1994. Geological Society of America (GSA).
Boulder, CO, United States. 1994.
Wells-Michael-L; Snee-Lawrence-W, 1993, Geologic and thermochronologic constraints on the initial orientation of the Raft River detachment and footwall shear zone. In: Geological Society of America,
Cordilleran Section, 89th annual meeting, and Rocky Mountain Section, 46th annual meeting.
Abstracts with Programs - Geological Society of America. 25; 5, Pages 161-162. 1993. Geological
Society of America (GSA). Boulder, CO, United States. 1993.