61. GeoTech.org - Basic Geology Basic geology. What is a Rock? Fractures mau be divided in two categories, joints and faults. A joint is a crack alon which no appreciable movement has occured. http://www.geotech.org/survey/geotech/basicgeo.html

You might be a geologist if ... you can pronounce the word "molybdenite" correctly on the first try. Basic Geology What is a Rock? A rock is many things. It is a collection of the particular chemical elements that make it up. The elements form compounds or a mineral assemblage that usually occurs in crystalline form. The minerals make up the rock in a great variety of arrangements. In coarse grained rocks the minerals are large enough to be seen with the naked eye. In fine grained rocks the individual grains are so small that they can only be viewed with a magnifying glass or microscope. A rocks history begins with its birth. It may subsequently be deformed mechanically, become chemically and minerally changed, and moved laterally or vertically in response to external forces. Rock Type Igneous Any rock made by the cooling of magma. This origin is reflected in their texture which is like a mosaic of crystals. Igneous rocks are divided into two types. intrusive: rocks that were emplaced within rocks that surround them. They originated as hot magma that pushed it way into cracks and other openings. extrusive: rocks form form lava that flowed out of volcanoes or from volcanic ash that was released high into the air and fell back to the ground.

62. Extensional_basins RL, SHARP, I., UNDERHILL, JR, GUPTA, S. (1997) Linked sequence stratigraphic and structural evolution of propagating normal faults. geology, 25, 795798. http://www.brookes.ac.uk/geology/8353/extens/extensional_basins-rl.html

EXTENSIONAL BASINS REFERENCES BURCHETTE, T. P. (1988) Tectonic control on carbonate platform facies distribution and sequence development: Miocene, Gulf of Suez. Sedimentary Geology, 59, 179-204. COWIE, P.A. (1998) A healing-reloading feedback control on the growth rate of seismogenic faults. Journal of Structural Geology, 20, 1075-1087. KATZ, J.K. (1995) A survey of rift basin source rocks. In Hydrocarbon Habitat in Rift Basins (Ed. Lambiase, J.J.) Geological Society Special Publication No. 80, pp 213-242. SCHLISCHE, R.W. (1995) Geometry and origin of fault-related folds in extensional settings AAPG Bull, 79, 1661-1678. WINN, JR, R.D., CREVELLO, P.D. AND BOSWORTH, W. (2001) Lower Miocene Nukhul Formation, Gebel el Zeit, Egypt: Model for structural control on early synrift strata and reservoirs, Gulf of Suez. AAPG Bulletin, 75, 1871-1890.

63. StructureF98 Syllabus lecture text Structural geology of rocks and regions, Davis and Reynolds, 1996. faults I Fault rocks, recognition, classification of faults and fault surfaces http://www.uakron.edu/geology/mcconnell/structGeo/syllabus/

STRUCTURAL GEOLOGY Dr. David McConnell syllabus lectures geology home page Course Information: course number 3370:350-001/011 time: lecture, MWF 11 - 11.50 a.m.; lab M 2.15 - 4.45 p.m. location: Crouse Hall, room 111 lecture text: Structural Geology of rocks and regions, Davis and Reynolds, 1996 Instructor Information: instructor: David McConnell office: Crouse Hall, room 216 office hours: WF 2 - 3.30 p.m. or by appointment phone: 972-8047 e-mail: dmcconnell@uakron.edu Grading Policy: exams: three exams based upon lecture material: 45% of the final grade class participation: 5% of the final grade Ask and answer questions based upon readings and material discussed in class weekly lab exercises: 30% of the final grade 3-day field trip in October with a report: 5% of the final grade paper on topic to be assigned during the semester: 15% of the final grade Information on the paper go to top of page Reading Assignments: You must read the text book to succeed in this class. I will assume you have completed the reading assignments prior to the relevant class period. Some readings will not be discussed directly in class but will be necessary to ensure an understanding of the topics under discussion. Click on the hyperlinks below to go directly to the pages for each week's material Week 1 Introduction. Read pages 2-37.

64. Logan Library Archives - Newspapers And Maps Subj faults (geology) NQ Box 1 topo maps fd 6 Ti Cache County Utah Sensitive area map. Subj faults (geology) Subj UTAH geology MAPS. http://www.logan.lib.ut.us/library/archives/archnq.html

ARCHIVES Newspapers and Maps (NQ BOXES) (To search this document, use the 'FIND' function of your browser, or [CTRL][f] for the Windows search window.) NQ Box 1 NQ Box 2 NQ Box 3 NQ Box 4 ... NQ Box 14 NQ BOX 1 BACK TO TOP NQ BOX 2 BACK TO TOP NQ BOX 3 BACK TO TOP NQ BOX 4 BACK TO TOP NQ BOX 5 BACK TO TOP NQ BOX 6 BACK TO TOP NQ BOX 7 BACK TO TOP NQ BOX 8 BACK TO TOP NQ BOX 9 BACK TO TOP NQ BOX 10 BACK TO TOP NQ BOX 11 BACK TO TOP NQ BOX 12 Nq Box 12 Folder #20 Title: Logan City and Cache County Bus Schedules Date: December 2002 Cont: Map of Cache County bus route - Map of Logan bus route - Map of USU Aggie Shuttle Route. Subj: BUS SCHEDULE Subj: LOGAN TRANSIT DISTRICT BACK TO TOP NQ BOX 13 BACK TO TOP NQ BOX 14 SEARCH OUR SITE Home Online Catalog My Account ... Accelerated Reader Logan Library Hours: Monday - Thursday: 10:00 am - 9:00 pm Friday - Saturday 10:00 am - 6:00 pm Closed Sunday and Major Holidays Address and Telephone: 255 North Main, Logan Utah 84321 Email the Library

65. Faults (Geology) Faults faults Subsurface Fluid Flow in the Shallow Crust faults Subsurface Fluid Flow in the Shallow Crust Written by William C. Haneberg geology EOA EduTutor Vol http://all-computer-books.co.uk/Faults_(Geology)_Faults.html

Home Search High Volume Orders Links ... On Line Algorithms Additional Subjects Poggio Nayar Beginning Visual Basic 6 Database Programming Jan Walliser One on One: The Best Women's Monologues for the Nineties ... The Samurai's Daughter: A Japanese Legend Featured Books The California Traveler Series are an excellent group of small books that give you whatever you want to know about various aspects of California in a quick and painless way. The book on Earthquakes will let you know which part of the State is prone to rock and roll and which areas are immune from constantly changing landscape. The text and diagrams are excellent in clarifying the problem of earthquakes. Written by Eleanor H. Ayer Renaissance House Published by Renaissance House Pub (June 2003) ISBN 1558381201 Price $6.95 Growing up in Oregon's Willamette Valley, basalt cliffs have watched over my life. More flood basalt and Rocky mountain gravels and mud are under my feet, and for most of my life I've lived within the shores of glacial lake Allison. When I go the rugged Pacific coast I look at beautiful haystack rocks and headlands where the same lava streams flowed, or I climb volcanic peaks just inland. Flood-wrenched lavas greet me in my travels up the Columbia and Snake Rivers, through the gorge, coulees ... Written by Marge Mueller Ted Mueller Published by Univ of Idaho Pr (June 2003) ISBN 0893012068 Price $19.95

66. Untitled In addition to showing different types and ages of rocks, most geologic maps depict geologic features, such as faults, folds, and volcanoes. http://geology.asu.edu/~sreynolds/azgeomap/azgeomap_map_explanation.htm

GEOLOGIC MAP OF ARIZONA The Essence of a Geologic Map In addition to showing different types and ages of rocks, most geologic maps depict geologic features, such as faults, folds, and volcanoes. The Geologic Map of Arizona shows faults (breaks in the rock produced by a slipping motion) with heavy lines. Notice that faults are nearly absent from northeastern Arizona, but are more common in the rest of the State. A geologic map gives clues to the age of a fault because it shows which rock units are cut by the fault and are therefore older than the fault, and which rock units were deposited across the fault after it was formed. Knowing the age of a fault is important for assessing the potential for earthquakes along that fault: The more recently the fault has moved, the more likely it is to move again and produce earthquakes. Uses of a Geologic Map Geologic maps are used in four major ways: (1) to discover mineral and energy resources; (2) to assess the potential for natural hazards, such as earthquakes and volcanoes; (3) to evaluate the suitability of an area as a construction site; and (4) to convey information about the geologic history of an area. A geologic map is one of the most important guides for finding essential mineral resources, such as copper and petroleum, the source of gasoline and many synthetic materials, including textiles. A mineral commodity is commonly formed in a specific environment and is therefore associated with one or more specific types of rocks. For example, most gypsum, which is used in the construction of wallboards, is formed by the evaporation of water in lakes or shallow lagoons. The logical place to look for gypsum, therefore, is an area containing rocks that represent these ancient waterways.

67. Stock Photography And Images Online - Omni Photo Communications geology joints faults. geology minerals/ rocks/ petrified wood/ concretions. Found 2 image(s) in your search for category geology JOINTS faults. http://www.omniphoto.com/index.cfm?Category=NH-30H&check=NATURE&page=catresults

68. Structural Geology Notebook - Tear Faults Twiss, Robert J. and Moores, Eldridge M.; Structural geology WH Freeman and Company, 1992, pp 103 and 113. Above can be seen a small tear fault that linkgs the http://maps.unomaha.edu/Maher/geo330/sandbox/tina3.html

TEAR FAULTS Reference : Twiss, Robert J. and Moores, Eldridge M.; Structural Geology W. H. Freeman and Company, 1992, pp 103 and 113. Above can be seen a small tear fault that linkgs the backthrust with the irregular thrust front. Tina Alder 3/27/97

69. Structural Geology: Faults, Folds, And Fabrics 800 AM1200 PM, Colorado Convention Center C109. Structural geology faults, Folds, and Fabrics. John G. Solum and Alexander P. Bump, Presiding. http://gsa.confex.com/gsa/2002AM/finalprogram/session_3329.htm

Session No. 13 Sunday, October 27, 2002 8:00 AM-12:00 PM, Colorado Convention Center: C109 Structural Geology: Faults, Folds, and Fabrics John G. Solum and Alexander P. Bump, Presiding Paper # Start Time 8:00 AM HANGINGWALL-TO-DETACHMENT TRANSITION AT A THIN-SKINNED EXTENSIONAL DETACHMENT FAULT IN THE EASTERN BLACK WARRIOR BASIN, ALABAMA : GROSHONG, Richard H. Jr and CATES, Luke M., Department of Geological Sciences, The Univ of Alabama, Tuscaloosa, AL 35487-0338, rhgroshong@cs.com 8:15 AM CHARACTER OF DEFORMATION ADJACENT TO THE SAN ANDREAS FAULT, DURMID HILL, CA : WOJTAL, Steven F., Oberlin, OH 44074, steven.wojtal@oberlin.edu. 8:30 AM TRANSIENT VERSUS LONG-TERM STRAIN ACCUMULATION ON THE BLACKWATER FAULT, EASTERN CALIFORNIA SHEAR ZONE : OSKIN, Michael E., Institute for Crustal Studies, Univ of California, Santa Barbara, 1140 Girvetz Hall, Santa Barbara, CA 93106, oskin@crustal.ucsb.edu. 8:45 AM 1.1 MA MELT PULSES IN PSEUDOTACHYLYTE FROM THE ALPINE FAULT, NZ : VAN DER PLUIJM, Ben A., Geological Sciences, Univ of Michigan, 2534 CC Little Building, Ann Arbor, MI 48109-1063, vdpluijm@umich.edu, WARR, Laurence N., Geologisch-Paläontologisches Institut, Ruprecht-Karls-Universität, Heidelberg, Germany, PEACOR, Donald R., Geological Sciences, Univ of Michigan, Ann Arbor, MI 48109, and HALL, Chris M., Geological Sciences, Univ of Michigan, 4534 CC Little Building, Ann Arbor, MI 48109-1063 9:00 AM FABRICS AND AGE OF CLAY GOUGE IN THE MOAB FAULT, UTAH, USA

70. University At Buffalo, Department Of Geology, Dr.Gerald J. Smith orientations A potential methodology for determining recurrence rates and magnitudes in paleoseismic studies of syndepositional faults Geological Society of http://www.geology.buffalo.edu/Faculty/smith.html

Dr. Gerald J. Smith Research Associate Professor 782 Natural Sciences 716-645-6800 ext 2470 stratigrapher@msn.com COURSES TAUGHT GLY 106 Introductory to Field Mapping GLY 215 Soft Rock I: Sedimentology GLY 216 Soft Rock II: Stratigraphy and Paleontology EDUCATION BA (Geology) State University of New York at Buffalo, February 1990. Ph.D. (Geology) State University of New York at Buffalo, September 1997. 3 Sisters, Blue Mountains Australia, photo by G. Smith. RESEARCH INTERESTS My research interests include the study of clastic, shallow-marine depositional environments as affected by local and regional tectonics. Recent focus is investigating historic petroleum reservoirs as resulting from fault-controlled sediment traps. My current research involves reexamining and revising the Late Devonian to Early Pennsylvanian section of the Catskill Delta Complex with the goal to more accurately describe the depositional environments and sequence stratigraphy. Additional research through the Ocean Drilling Program focuses on examining the changes in ichnology with differing environmental influences. For More Info on Sedimentology and Stratigraphy Research Click Here GRANTS AWARDED 1998 – Ocean Drilling Program, participation as shipboard sedimentologist in ODP Leg 181, South Pacific Gateway: Paleohydrography of the Deep Pacific Source – $23,000.

71. Terrain Sciences, Geological Survey Of Canada Bedrock geology Joints and faults. The flatlying Paleozoic formations are transected by numerous steeply dipping joints. Joint planes http://sts.gsc.nrcan.gc.ca/urban/bed_joints.asp

Contact us Help Search Canada Site ... Acknowledgment Bedrock Geology Joints and Faults The flat-lying Paleozoic formations are transected by numerous steeply dipping joints. Joint planes vary from 30 cm to more than a metre and the spacing increases with increasing bed thickness. Numerous closely spaced joints commonly occur close to faults and are parallel to them, suggesting a genetic relationship between the joints and faults. Joints in carbonate rocks have been commonly widened by solution. Joints are commonly filled by calcite with minor pyrite, barite, celestite, and gypsum ( Williams 1991 ). Precambrian rock formations form a complex pattern of joints and folds. The entire region is transected by numerous steeply dipping normal faults and fault zones which have relative vertical displacements exceeding 785 metres in places. Identification of faults and fault zones is accurate in areas of bedrock outcrops; in areas of thick drift, the exact location of faults is not as precise as their location has to be interpolated from adjacent areas aided by the use of drillholes, geophysical survey data and fault-controlled topographic features. Important Notices

72. The Talk.Origins Archive: Flood Geology FAQs in Error? The Lewis Thrust Creationists often claim that geological strata are Thrust faults and the Lewis Overthrust Thrusting that occurs along fault lines http://www.talkorigins.org/origins/faqs-flood.html

Flood Geology "Lord, Lord! methought what pain it was to drown: What dreadful noise of water in mine ears! What sights of ugly death within mine eyes!" - William Shakespeare, King Richard III Problems with a Global Flood This article presents a list of questions that the story of Noah's Ark and a global flood leave unanswered and probably unanswerable, such as: How did all the fish survive? and, When did granite batholiths form? Flood Stories from around the World While flood myths are common to practically every culture on the planet, most of them are significantly different in detail. This article describes nearly a hundred flood myths originating from cultures all over the globe. Sun Pictures and the Noah's Ark Hoax In 1993, CBS aired a purported documentary called The Incredible Discovery of Noah's Ark . The show's producers, however, were the victims of a hoax. "Man Tracks?": The Paluxy River Footprint Controversy For many years, creationists claimed that a set of human tracks were found alongside dinosaur tracks in the Paluxy riverbed near Glen Rose, Texas. However, due in large part to the diligent investigative and scientific work of Glen Kuban, even most creationists now doubt the authenticity of the "man tracks". "Polystrate" Fossils Creationists and catastrophists have attempted to justify a global flood by claiming that there are fossils cutting through many geological strata. A number of so-called "polystrate" fossils are examined here.

73. Class Notes plain and with geology An unconformity somewhere in the desert plain and with geology Zumaya Flysch, Spain plain and with geology faults, Folding, http://www.es.ucsc.edu/~es10/classnotes/images/drawn.html

Geologic Images Associated with Lectures What are the geologic features and geologic history of these places? Look at the "plain" images first, figure out the geology, and then look at the images with the geology drawn in. Igneous Rocks Patagonia Pluton plain and with geology Intrusive Contact (close-up of Patagonia Pluton) plain and with geology Roof Pendant plain and with geology Alpine Karst plain and with geology Deep-Marine Deposits in Antarctica plain and with geology Grand Canyon plain and with geology Karst Topography in China #1 plain and with geology Karst Topography in China #2 plain and with geology Karst Topography in China #3 plain and with geology Landslide/ Earth Pillar plain and with geology Limestone Caves plain and with geology Meandering San Juan River, Utah plain and with geology Mississippi Delta plain and with geology Pinnacles of Northern Colorado plain and with geology plain and with geology Southern Ramparts, AZ plain and with geology Turtle Bay, Baja California plain and with geology An unconformity somewhere in the desert plain and with geology Zumaya Flysch, Spain

74. Earth Sciences Research geology). Principal areas of research the causes and consequences of fault reactivation and longterm weakness; the spatial attributes and growth of faults; http://www.dur.ac.uk/geolsci.www/research/structural/struct_index.htm

Home News People Alumni ... Calendar Earth Sciences Research Pages Current Research Areas: Structural Geology Dr R E Holdsworth (Reader in Structural Geology) Principal areas of research: the causes and consequences of fault reactivation and long-term weakness; the spatial attributes and growth of faults; strain partitioning in regions of oblique convergence/divergence; flow kinematics in crustal and mantle deformation zones. Bob is also the founder of the Reactivation Research Group. more.. Dr K J W McCaffrey (Lecturer in Structural Geology) more.. Dr J Imber (Post-Doctoral Research) Currently working on a NERC Ocean Margins LINK project that aims to quantify the influence of basement fault reactivation in passive margin settings. This research will compare the growth of fault systems in which there is clear basement involvement with that of ‘thin-skinned’ fault systems using high quality 2D/3D seismic data from various NE Atlantic margin basins. Other research interests include: (1) modelling relay zones on normal faults using 3D distinct element techniques; (2) constraining the thermal and rheological evolution of basement faults using finite difference models; and (3) the interaction between tectonics and sedimentation in growth faulted terranes.

75. Our Hoosier State Beneath Us: Structural Geology: Faults Of Southwestern Indiana Recent mapping by the Indiana Geological Survey has located many of the bedrock faults in southern Indiana and has shown that they have been inactive in recent http://www.indiana.edu/~librcsd/etext/hoosier/SG-02.html

Faults of Southwestern Indiana (SG-02) Earthquakes were probably common in southwestern Indiana when several ancient faults that are found in the bedrock were formed, but no modern earthquakes are known to have been associated with them. Even more intense earthquakes in that region have been related to the New Madrid, Missouri, seismic zone, a major area of earthquake activity in the midcontinent region of North America. In 1811-12 three major earthquakes, centered in that area, were among the greatest in recorded history. The recurrence of such earthquakes could have disastrous consequences in Indiana. Recent mapping by the Indiana Geological Survey has located many of the bedrock faults in southern Indiana and has shown that they have been inactive in recent times. Increased knowledge of these structures will also help in exploring for and developing coal and petroleum that are associated with these faulted rocks. Our Hoosier State Beneath Us: Structural Geology

76. Major Faults & High-Strain Zones | The Geology Of Virginia Valley Ridge faults. Lowangle thrust faults of Alleghanian age (~300 Ma). Mesozoic faults. Brittle normal faults of Mesozoic age (~200 Ma). CB- DR-, http://web.wm.edu/geology/virginia/faults.html

faults Low-angle thrust faults of Alleghanian age (~300 Ma). BR- CC- HV- N- NM- Sa- SP- Blue Ridge fault system Copper Creek fault Hollston Valley fault Narrows fault North Mountain fault Saltville fault Staunton-Pulaski fault Blue Ridge high-strain zone Reverse ductile high-strain zones of Precambrian to Alleghanian age (~700 to ~300 Ma). F- R- Q- Fries zone Rockfish Valley zone Quaker Run zone Piedmont high-strain zones Reverse and strike-slip ductile high-strain zones of Taconic to Alleghanian age (~450- ~300 Ma). Many faults reactivated during Mesozoic. B- BC- CP- Ho- Hy- MR- NC- S- Sh- Brookneal zone Bowens Creek fault Central Piedmont zone Hollister zone Hylas zone Mountain Run zone Nutbush Creek zone Spotsylvania zone Shores melange zone Mesozoic faults Brittle normal faults of Mesozoic age (~200 Ma).

77. Geology: Earthquakes The geology of Japan Earthquakes. Lecture Outline. Earthquakes and faults. As two plates collide, stress is built up and faults (or cracks) appear in the crust. http://www.seinan-gu.ac.jp/~djohnson/natural/quakes.html

The Geology of Japan: Earthquakes Lecture Outline Cause and Occurrence of Earthquakes. The same plate tectonic activity that causes volcanoes also causes earthquakes. Subduction can create stress in the rock crust that results in slippage causing earthquakes. Earthquakes and Faults. As two plates collide, stress is built up and faults (or cracks) appear in the crust. If there is little friction along the fault, creep may occur, that is, there may be gradual movement of the ground on one or both sides of the fault. This type of fault activity does not usually result in death or injury, since there are no sudden movements. If, however, friction prevents gradual movement, the stress will built up until sudden slippage occurs along the fault. This is an earthquake. If the stress occurs in deep crust layers where rock is hot, the crust may gradually fold rather than slip (no earthquake occurs). Earthquake Focus and Epicenter. The point along a fault where movement first occurs is called the earthquake's focus . The point on the earth's surface immediately above the focus is called the earthquake's epicenter . The focus of many of Japan's earthquakes is very deep (over 100 km, or 62 mi)

78. Earthquakes And Faults Try searching on subject headings such as geology, faults, EARTHQUAKES, SEISMOLOGY. If you are researching earthquakes or faults http://www.csupomona.edu/~library/publications/guides/Quakes/quakes.html

University Library Cal Poly Pomona Earthquakes and Faults CONTENTS: Getting Started - Finding Books Indexes and Abstracts - Finding Articles Locating Faults Earthquakes on the Internet Getting Started - Finding Books For background information, as well as for information on specific earthquakes and faults, look for books using the Library Catalog Try searching on subject headings such as: GEOLOGY, FAULTS, EARTHQUAKES, SEISMOLOGY. If you are researching earthquakes or faults in a particular area, add the name of the state to the subject heading, for example EARTHQUAKES CALIFORNIA. Use the indexes in the books to find references to the earthquakes or faults of interest. You can also try searching on names of specific earthquakes (e.g. LOMA PRIETA) or specific faults (e.g. SAN ANDREAS). However, only major well researched earthquakes and faults will have their own subject headings. The lack of a subject heading for a specific earthquake or fault does not mean that the Library has no material on that subject; try the subject headings listed above. If a subject search is unsuccessful, try using the KEYWORD option. Return to Top Indexes and Abstracts - Finding Articles Much of the information available on earthquakes is published in journals or in reports of agencies such as the U.S. Geological Survey (USGS) or the California Division of Mines and Geology. The sources listed below will help you locate this material.

79. Travels With Geology - Grand Teton National Park Geologic Structure. The Tetons are among the youngest ranges in the Rocky Mountains. Such faults are the result of extension or stretching in the earth s crust. http://www.winona.msus.edu/geology/travels/tetons/travel.html

Geology of Grand Teton National Park, Wyoming, U.S.A. Archival versions of the images in this document can be downloaded from the Geology Image Archive for your own use by clicking on the image. Introduction Grand Teton National Park is the destination of more than 3 million vistors a year who are searching for a vacation spot that provides scenic splendor, a varied ecosystem with abundant wildlife, and excellent recreational opportunities. The Teton Range is the focal point of the park, rising more than 7,000 feet above the floor of Jackson's Hole which borders the mountains on the east (Fig. 1). The steep eastern front of the range is unique in the Rocky Mountains and is the result of erosion of the Precambrian crystalline rocks along the steeply dipping Teton normal fault. The summit of the Grand Teton stands 13,770 feet above sea level and is the second highest summit in the state of Wyoming. Figure 1. Grand Teton Range and adjacent Jackson's Hole, Wyoming, U.S.A. - aerial view from the north. Rocks of the Teton Range The bedrock of the Teton Range is primarily ancient, hard crystalline rock including darker-colored metamorphic rocks (such as the Mt. Moran Gneiss) and lighter-colored igneous rocks (such as the Mt. Owen Granite) (Fig. 2). These rocks were formed during the Archean portion of Precambrian time, prior to 2.5 billion years ago, and were subsequenty intruded by later Precambrian (Proterozoic) dark-colored diabase dikes around 1.1-1.3 billion years ago. The best exposure of these dikes is on the eastern face of Mt. Moran where the "Black Dike" extends from the summit of the peak downward to Leigh Lake on the floor of the valley. The geologic map and cross section in Figure 2 portray these Precambrian crystalline rocks in purple.

80. Finding Faults Finding faults "Scripps Institution of Oceanography is one of the oldest, largest, and most important centers for marine science research, graduate training, and public service in the world." As http://rdre1.inktomi.com/click?u=http://sio.ucsd.edu/explorations/faults/&y=

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