Stratigraphic formation. Geologic Setting. Between 1.4 billion and 990 mya, volcanic activi...

Stratigraphy is a term used by archaeologists and geoarchaeologists

stratigraphic formation. sequence of strata that is distinctive enough to be traced as a package across a fairly large region. geologic map. map that portrays distribution of stratigraphic formations. ripple marks.Rock deposition. The story of how Grand Canyon came to be begins with the formation of the layers and layers of rock that the canyon winds through. The story begins about 2 billion years ago when igneous and metamorphic rocks were formed. Then, layer upon layer of sedimentary rocks were laid on top of these basement rocks.Formation; and our thick deposit of sand and gravel of the Old Alluvium. TriTech Sketch by Michael Lee. TriTech Geological Setting of Singapore. TriTech 1 2 4 5 Geologic Setting of Singapore Singapore’s natural deposits are classified under 10 geological formations. In decreasing age, they are outlined with theirAdoptee identity formation is a complex process that shapes the adoption mind. The adoption experience can have a profound impact on an individual’s sense of self and how they view the world.sandstone, and throughout the region the main ridge-forming stratigraphic unit is the Silurian Tuscarora Sandstone. Subordinate ridges with lower elevation ridge crests are held up by other sandstones, most commonly the Devonian Oriskany Sandstone, the Devonian Hampshire Formation, or the Devonian-Mississippian Price Formation. The valleys areThe Lower Cretaceous (Berriasian to Valanginian) Habshan Formation (Lower Thamama Group) of Abu Dhabi was deposited on a broad carbonate shelf. In east onshore Abu Dhabi, the Habshan Formation consists mainly of limestone and dolomite reaching a thickness of more than 1,100 feet. ... However the stratigraphic relationship between the shallow ...The main stratigraphic unit is a formation. A formation is a series of beds that is distinct from other beds above and below, and is thick enough to be shown on the geological maps that are widely used within the area in …Glen Rose Formation stratigraphic column in Texas. The Glen Rose Formation is a shallow marine to shoreline geological formation from the lower Cretaceous period exposed over a large area from South Central to North Central Texas. The formation is most widely known for the dinosaur footprints and trackways found in the Dinosaur Valley State Park …Stratigraphic correlation is the process of establishing which sedimentary strata are the same age at distant geographical areas by means of their stratigraphic relationship. ... In Zion, the Navajo Sandstone overlies the Kayenta Formation which overlies the cliff-forming Moenave Formation. Based on the stratigraphic relationship, ...Green River Formation; Stratigraphic range: Eocene, 53.5-48.5 ... The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes in three basins along the present-day Green River in Colorado, Wyoming, and Utah. The sediments are deposited in very fine layers, a dark layer during the ...A collaboration between the CGS and the Denver Museum of Nature & Science (DMNS) generated a new stratigraphic chart for the state of Colorado. This color chart was designed from the ground up to illustrate the Proterozoic to Holocene stratigraphy that spans the state’s many sedimentary basins.A collaborative effort led by Robert Raynolds …Most of the area has now been mapped at 1:24,000 or larger, and the stratigraphic relationships are well established. Therefore, descriptions of the units and formalization of the nomenclature are now presented in Stratigraphic Chart 1. Previously used stratigraphic names have been retained where possible; however, several existing names were ...This report provides a comprehensive overview of the regional stratigraphy and subsurface geology of Cenozoic deposits in the Gulf Coastal Plain of south-central United States, focusing on the Wilcox Group and its hydrocarbon potential. It includes detailed maps, cross-sections, lithofacies descriptions, and paleoenvironmental interpretations of the Wilcox Group and its equivalents across the ...The stratigraphic succession is an asymmetrical cyclothem composed of nine facied including, in ascending order: (1) flat-bedded sandstone, carbonaceous and commonly clayey siltstone and sandstone, and generally silty and clay-ironstone-bearing gray shale, represented by the uppermost parts of the Dakota Formation; (2) gray, noncalcareous silty ...stratigraphic reports is to place the geologic-map explanation and the stratigraphic chart alongside the geology section of the text. As the geology section is read, it can easily be compared with the other two parts. An assessment may be made at that time con- cerning stratigraphic changes and conformance with the code. Selected charts, sections, and lexicons are provided here. The National Geologic Map Database is collaborating with State Geological Surveys, to provide assistance in addressing local and regional stratigraphic nomenclature issues within a State, and between adjacent States. The Geologic Name Committee's (GNC) large collection of …Geologic Setting. Between 1.4 billion and 990 mya, volcanic activity, crustal rifting and filling of basins (formed by rifting) took place. Between 990 and 880 mya, a mountain range formed in eastern Ohio. Between 880 and 544 mya, these mountains were eroded, reducing the landscape to a gently rolling surface.Louisiana Geological Survey 3079 Energy, Coastal and Environment Building Baton Rouge, LA 70803 Telephone: 225-578-5320 Fax: 225-578-3662 Website content questions or comments Email: Robert Paulsell - [email protected] stratigraphic profile used here is from the site of Namu. It should be noted that this profile was created through several depositional episodes. ... Formation processes may be cultural (c- transforms) or natural (n-transforms). A c-transform is defined as the deliberate or accidental activities of humans. It is important, in analysis, to ...Formations are the only formal lithostratigraphic units into which the stratigraphic column everywhere should be divided completely on the basis of lithology. The contrast in lithology between formations required to justify their establishment varies with the complexity of the geology of a region and the detail needed for geologic mapping and ...The Permian basin of west Texas and Southeastern New Mexico is one of the major petroleum producing regions of the United States. This basin produced 3% of the world's petroleum in 1984 and in that year, 1% of the …The names of most formal stratigraphic units consist of an appropriate geographic name combined with an appropriate term indicating the kind and rank of the unit, e.g. La Luna Formation, except for some terms that were established in the early history of stratigraphy. They helped in direct detecting the presence of hydrocarbon accumulation in the stratigraphic trap, in the region around well Du-1 at the upper part of Mishrif Formation, which is located at a ...OAC 165:10-1-28. Geological correlation chart The chart initially prepared by Phillips Petroleum and maintained by the Oklahoma City Geologic Society entitled "Geologic Section of Oklahoma and Northern Arkansas", along with ensuing revisions, shall be used as a guideline for stratigraphic nomenclature in all oil and gas conservation …Stratigraphy is a term used by archaeologists and geoarchaeologists to refer to the natural and cultural soil layers that make up an archaeological deposit. The concept first arose as a scientific inquiry in 19th-century geologist Charles Lyell 's Law of Superposition, which states that because of natural forces, soils found deeply buried will ...The 1983 North American Stratigraphic Code adopted the formal terms lithodeme, which is comparable to a formation; a suite, which is analogous to a group, and a supersuite, similar to a supergroup. A lithodeme is the fundamental unit and should possess distinctive and consistent lithological features, comprising a single rock type or a mixture ...formations. The lithology is the physical makeup, including the mineral composi­ tion, grain size, and grain packing, of the sediments or rocks that make up the geological systems. The stratigraphy describes the geometrical and age relations between the various lenses, beds, and formations in geologic systems of sedimentary origin.Abstract. In the central Williston basin, USA, the Bakken Formation and overlying lower Lodgepole Formation both have fine-grained, organic-rich stratigraphic units that have been interpreted sedimentologically to represent deep-water deposition in a low-energy, distal-marine environment; however, these formations display vastly different stratigraphic geometries that challenge the ...The Atmosphere and Hydrosphere. Kent C. Condie, in Earth as an Evolving Planetary System (Third Edition), 2016 Banded Iron Formation. Banded iron formation or BIF is a chemical sediment, typically thin-bedded or laminated with > 15% iron of sedimentary origin (Figure 8.6).BIF has a very distinct distribution with time (Figure 8.25).It is found in minor …Wilcox Group - stratigraphy. The Wilcox Group is an important geologic group in the Gulf of Mexico Basin and surrounding onshore areas from Mexico and Texas to Louisiana and Alabama.The group ranges in age from Paleocene to Eocene and is in Texas subdivided into the Calvert Bluff, Simsboro and Hooper Formations, and in Alabama into the …The Blackhawk Formation consists of six sequences (originally formally defined as lithostratigraphic members by Young, 1955) and has been subdivided into 23 submembers (Hampson, 2010). The Castlegate Formation constitutes at least two sequences, depending on different stratigraphic interpretations (Bhattacharya, 2011, Miall, 2014a).A formation is a series of sedimentary beds distinct from other beds above and below and is thick enough to be shown on geological maps. Sometimes several formations are lumped together to form a group. If you want to propose a new formation or group, there are strict guidelines set up by the International Commission of Stratigraphy.The report provides a detailed description of the geology, stratigraphy, and mineral resources of the Phosphoria Formation, a major source of phosphate rock in the western United States. It also discusses the origin, distribution, and quality of the phosphate deposits, as well as their economic and environmental significance.Stratigraphic relationships. The Joliet Formation is differentiated as the basal formation of the Niagaran Series in an area extending from Chicago to Calhoun County in western Illinois (fig. S-1, S-3, S-5). Fig. S-1 -- Silurian System thickness, outcroup areas, nomenclature boundary, and reef in the Moccasin Springs Formation.stratigraphic formation. a sequence of sedimentary and/or volcanic layers that has a definable age and can be identified over a broad region. Principles of Relative Dating • principle of horizontality • principle of superposition • principle of cross-cuttingThe Walnut Formation has six members, from bottom to top, the Bull Creek, Bee Cave, Cedar Park, Whitestone, Keys Valley, and an unnamed upper marl. The Cedar Park Limestone Member is emended to include only the nodular fossiliferous micrite below the oosparite and pelsparite occurring at the Cedar Park quarries in Williamson County.Formation Finder a simple easy to use Digital Table of Formations. British Columbia Formations. Alberta Formations Saskatchewan Formations Manitoba Formations formation finder can improve your daily productivity. Start Your Search. Join our mailing list and stay informed about our news and updates. ...A formation is a series of sedimentary beds distinct from other beds above and below and is thick enough to be shown on geological maps. Sometimes several formations are lumped together to form a group. If you want to propose a new formation or group, there are strict guidelines set up by the International Commission of Stratigraphy.@article{osti_96219, title = {Differences in the stratigraphic framework of the Frio and Anahuac Formations in the Louisiana and Texas Gulf Coast Basin}, author = {Desselle, B A}, abstractNote = {The hydrocarbon endowment of the Frio and Anahuac formations of Louisiana and Texas has made them the most thoroughly studied geologic strata in the Gulf Coast Basin.Geologic Setting. Between 1.4 billion and 990 mya, volcanic activity, crustal rifting and filling of basins (formed by rifting) took place. Between 990 and 880 mya, a mountain range formed in eastern Ohio. Between 880 and 544 mya, these mountains were eroded, reducing the landscape to a gently rolling surface.Lithostratigraphy is a sub-discipline of stratigraphy, the geological science associated with the study of strata or rock layers. Major focuses include geochronology, comparative geology, and petrology. In general, strata are primarily igneous or sedimentary relating to how the rock was formed.The exposed stratigraphic formations of the Miocene–Pleistocene epochs represented by the Dibdibba, Lower Fars, and Ghar clastic sediments (Kuwait Group) were reviewed in the previous chapter as ...A common goal of stratigraphic studies is the subdivision of a sequence of rock strata into mappable units, determining the time relationships that are involved, and correlating units of the sequence—or the entire sequence—with rock strata elsewhere. Following the failed attempts during the last half of the 19th century of the International Geological Congress (IGC; founded 1878) to ...Stratigraphic Relations of Upper Cretaceous and Eocene Formations, San Diego Coastal Area, California' MICHAEL P. KENNEDY' and GEORGE W. MOORE' La Jolla: California 92037 Abstract This paper defines three Upper Cretaceous formations exposed in and near Son Diego, California. The lowest, which consists of boulder conglomerate, isPhone: 435-772-3256. If you have questions, please email [email protected]. Listen to recorded information by calling anytime 24 hours a day. Rangers answer phone calls from 11:30 a.m. to 3 p.m. and 3:30 p.m. to 5 p.m. MT, but a ranger may not answer if they are already speaking with someone else.Dasgupta K (1993) Some contributions to the stratigraphy of the Yerrapalli Formation, Pranhita-Godavari Valley, Deccan, India. J Geol Soc India 42:223-230. Google Scholar Dasgupta S (2009) Sandstone petrography and provenance determination from the upper Gondwana succession of the Rewa basin, India.Data of varying detail from abundant to scanty has been compiled on 44 Palaeozoic, 37 Mesozoic and 78 Cenozoic Onshore formations. Stratigraphic formations that staddle era boundaries would be included with the section where the bulk of the sediments within the unit are found, for example, the Permo-Triassic Semanggol formation is placed under ...Three important geological units of KG basin are Northern graben, the central Horst and several sub-basins (Fig. 2).Unlike other basins on the east coast of India, the KG basin is considered to be unique in nature as it is reported that hydrocarbon potential identified in almost all the stratigraphic formations.9 thg 7, 2020 ... Linking the predominantly terrestrial Mesozoic sedimentary rocks of eastern Australia to the Geologic Time Scale (GTS) has been an ongoing ...Formations Wolfcamp Cisco Canyon Strawn Atoka L. Miss Lm Woodford Devonian (Thirtyone) Upper Silurian (Wristen) Fusselman Montoya Ellenburger Rustler Lamar Cherry Canyon Brushy Canyon Bromide Tulip Crk. Mclish n Oil Creek McKee Sd. Waddell Sd. Connell Sd. Joins Bone Spring 3rd Sand Dewey Lake Salado Precambrian Basement Bell Canyon Morrow ... OAC 165:10-1-28. Geological correlation chart The chart initially prepared by Phillips Petroleum and maintained by the Oklahoma City Geologic Society entitled "Geologic Section of Oklahoma and Northern Arkansas", along with ensuing revisions, shall be used as a guideline for stratigraphic nomenclature in all oil and gas conservation …Part II: Sequence-stratigraphic expression of depositional systems; Sequence stratigraphy in lacustrine systems. Exercise 6.1: Seismic stratigraphy of the Paleocene Waltman Shale Member, Fort Union Formation, Wind River Basin, Wyoming / K.M. Bohacs and J.E. Neal; Sequence stratigraphy in alluvial systems.Controversy surrounding the stratigraphy of the Anambra Basin, depositional environments and conditions, and age of geologic formations present in the study basins were considered.a scientist who specializes in the study of earthquakes, or in the study of how seismic waves characterize the interior of the Earth. Seismicity. earthquake activity. Seismic Waves. waves of energy emitted at the focus of an earthquake. Displacement. the amount of movement or slip across a fault plane. Fault Scarp.Volume 6. Miguel Garcés, Elisabet Beamud, in Encyclopedia of Geology (Second Edition), 2021. Abstract. Magnetostratigraphy is the subdiscipline of stratigraphy that aims to divide the stratigraphic record into intervals of homogeneous magnetic polarity, named magnetozones.Each magnetozone corresponds to a period of Earth history, named geomagnetic chron (or chron), limited by two geomagnetic ...Figure 5.3.1 5.3. 1: Enlarged image of frosted and rounded windblown sand grains. Medium-grained rocks composed mainly of sand are called sandstone, or sometimes arenite if well sorted. Sediment grains in sandstone can having a wide variety of mineral compositions, roundness, and sorting.Early works of [1,2,3,4], and others, which formed the basis for the stratigraphic study of these basins were employed, but were updated by recent reputable works of [5,6,7,8,9,10] and others.The formation of the basin and its associated series of horsts and graben structures has been discussed by several authors (Brownfield & Charpentier, 2006; Ola & Olabode, 2018; Omatsola & Adegoke, 1981).Basement subsidence due to rifting initiated the deposition of sediments during the Lower Cretaceous, and an episode of tectonic activity …Bakken Formation Oil: The Bakken is one of the largest oil finds that the US Geological Survey has ever assessed. Although this video was produced in 2008, the information contained within it was a great prediction of Bakken Formation assessment and development. ... Bakken Stratigraphy: Generalized stratigraphy of Paleozoic rocks in the ...The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. ... Stratigraphy Type locality of the Salt Wash Member near White Wash, Grand County, Utah. The Morrison Formation is underlain by the brick-red ...When you write academically, you will research sources for facts and data, which you will likely include in your writing. Using this information will require that you cite your sources. Your instructor may require Harvard referencing format...In Zion, the Navajo Sandstone overlies the Kayenta Formation which overlies the cliff-forming Moenave Formation. Based on the stratigraphic relationship, the Wingate and Moenave Formations correlate. These two formations have unique names because their composition and outcrop pattern is slightly different.Grand Canyon stratigraphy and structural relations (Billingsley et al. 2019: Figure 2). Recently, the Sixtymile Formation was proposed to be Cambrian (not Proterozoic) (Karlstrom et al. 2018, 2020 ...formations in WAG 5. This work provides a reference frame for interpreting flow, water, and contaminant chemistry data from multiport wells. General geologic information about stratigraphic units in WAG 5 can be found in Hatcher et al. (1992). Geologic formations in WAG 5 consist of Cambrian-age Conasauga Group and includeStratigraphy, scientific discipline concerned with the description of rock successions and their interpretation in terms of a general time scale. It provides a basis for historical geology, and its principles and methods have found application in such fields as petroleum geology and archaeology.Stratigraphy is a term used by archaeologists and geoarchaeologists to refer to the natural and cultural soil layers that make up an archaeological deposit. The concept first arose as a scientific inquiry in 19th-century geologist Charles Lyell 's Law of Superposition, which states that because of natural forces, soils found deeply buried will ...The Deadwood Formation is an assemblage of siliciclastic, carbonate, and evaporite sedimentary rocks in North Dakota, South Dakota, Montana, Wyoming, Manitoba, and Saskatchewan. The majority of the lateral extent of the Deadwood Formation is in the subsurface of the Williston Basin, where it is the basal lithostratigraphic unit.Stratigraphy, scientific discipline concerned with the description of rock successions and their interpretation in terms of a general time scale. It provides a basis for historical geology, and its principles and methods …stratigraphic formations for the use of writers on these formations in adjacent regions, and of rendering the broad, structural results of the work available for use by local operators. In this connection it is a pleasure to acknowledge the valuable contributions toward these final conclusions. Thus, the investiga-Not all autogenic processes play a role in the formation of sequence stratigraphic surfaces, but only those that can influence the direction of shoreline shift. Any changes in shoreline trajectory ...Sep 12, 2022 · The purpose of this study was to establish the stratigraphic boundaries formed during the first-order changes that marked the beginning and the end of the lifespan of the retroarc foreland basin. In the initial stage, the lateral extent along the dip of the major depocenter of the basin was approximately 300-470 km. This chapter explains the important place Stratigraphy holds within geology. It provides a summary of the development of the main ideas in stratigraphic mapping, geophysical methods and sedimentological interpretation that emerged through the twentieth century, up to the emergence of modern-day "sophisticated stratigraphy," which completes the integration of all relevant disciplines into a ...The stratigraphy, general nature of the deposits and site formation based on artifact analyses are discussed above. Here, we turn to a discussion of the field and microscopic observations that contribute to understanding the entire site history, including geogenic and anthropogenic aspects of site formation.Glen Rose Formation stratigraphic column in Texas. The Glen Rose Formation is a shallow marine to shoreline geological formation from the lower Cretaceous period exposed over a large area from South Central to North Central Texas. The formation is most widely known for the dinosaur footprints and trackways found in the Dinosaur Valley State Park …Stratigraphic Forward Modelling is the use of mathematical formulae and algorithms to create synthetic stratigraphy, with the aim of understanding and predicting dynamic sedimentary systems ( Burgess 2012) ( Huang, et al., 2015 ). Natural systems are complex and dynamic, and consequently are difficult to model.The Original reference is the citation for the original publication defining the unit. The Type locality information is usually the type area of the formation rather than a specific type locality. Many of these formations were defined before the practice of designating a type locality became a part of proper stratigraphic description. Geologic columns are often also called stratigraphic columns, ... as is the name of each formation or facies. Facies are the subdivisions of a single formation, often detailing changing landscapes ...FORMATION VELOCITY AND DENSITY—THE DIAGNOSTIC BASICS FOR STRATIGRAPHIC TRAPS. A multiplicity of factors influence seismic reflection coefficients and the observed gravity of typical sedimentary rocks. Rock velocity and density depend upon the mineral composition and the granular nature of the rock matrix, cementation, …Formation provide a means for correlating individual stratigraphic sections along the Snake River between Hammett and Hagerman, Idaho. The sequence thus established, composing the lower part of the formation, is more than 1,700 feet thick. A set of columnar diagrams of 60 measured sections graphically... formations, units, package thickness, lithology and grain size. In short, a stratigraphic column can be used as a timescale for the formation of rocks, but ...1 thg 7, 2006 ... This report presents a new time-stratigraphic framework for the subsurface Potomac Formation of New Castle County, Delaware, ...The major emphasis of this investigation was to produce a stratigraphic "Rosetta Stone" of the Biwabik Iron Formation that ties the stratigraphy and differing submember terminology of one mine to all of the other mines on the Mesabi Iron Range. Toward that end, the Natural Resources Research Institute (NRRI) looked at core from over 380 ...Boundaries between formations can be of three types: strictly stratigraphic, parastratigraphic, and allostratographic. The stratigraphic interval can range from a fraction of a horizon or chronozone to several stages. At the boundary between two systems the adjacent parts of the formation can relate to both systems.In this digital exhibit, we will explore the stratigraphic column of the Grand Valley (see image to the left) to learn about the different layers and the fossils contained within them. What is a geologic formation? A geologic formation is a rock layer or sequence of rock layers that are distinct from units above and below. A formation must be ... Chemostratigraphy is the study of the inorganic/organic chemical variations within the sedimentary sequences, either based on the elemental or isotopic composition of the rock. It provides a useful tool for unconventional resource exploration and development. The chemistry of a rock varies with its mineral composition (Fig. 2).Rock chemistry is relatively easy to measure, so quantifiably, the ...The Kakul Formation is unfossiliferous but based on its stratigraphic position Cambrian age has been suggested by Shah 1977. The Abbottabad Formation (Marks and Ali 1962 ) is well exposed in the HB. The Formation comprises a thick succession of shale, sandstone, dolomite, limestone, and siltstone.Seismic Stratigraphy is a topic that covers the study of stratigraphy and depositional facies as interpreted from seismic data. It involves various techniques and applications, such as seismic profiling, seismic sequence analysis, seismic geomorphology, and intelligent seismic modeling. Learn more about this fascinating field and its relevance to earth and planetary sciences from the articles ...A Review of the Stratigraphy of the Ogallala Formation and Revision of Neogene ("Tertiary") Nomenclature in Kansas. Greg A. Ludvigson 1,2, Robert S. Sawin 1,2, Evan K. Franseen 1,2, W. Lynn Watney 1,2, Ronald R. West 2,3, and Jon J. Smith 1 1 Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047A stratigraphic column at the Mount Bonnell Fault location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group. Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the Eagle Ford Group. Formations within the Edwards Group include the Kainer Formation and the Person Formation.Stratigraphic nomenclature is the system of proper names given to specific stratigraphic units, which provides a universal language essential for all scientific publications. Consistent and effective communication in the geosciences requires systematic use of stratigraphic nomenclature. This review of geologic names usage and stratigraphic principles serves as a foundation for professionals ...Stratigraphy and Ostracoda of the Northern Gulf Coastal Region. Baton Rouge: Louisiana Geological Survey (Bulletin 45). Banks ˜ ˛ MESOZOIC STRATIGRAPHIC CHART ERATHEM SYSTEM SERIES GROUP REMARKS MESOZOIC CRET A CEOUS JURASSIC TRIASSIC 1) Formations and members are shelf units. The right columns shows distal-source facies. Stratigraphic Columns Overview. Accessible from the The Permian Basin Part II: Spraberry/Midland is The iconic PDF: a digital document file format developed by Adobe in the early 1990s. PDFs are very useful on their own, but sometimes it’s desirable to convert them into another type of document file. This is easy to do with the right soft...The report provides a detailed description of the geology, stratigraphy, and mineral resources of the Phosphoria Formation, a major source of phosphate rock in the western United States. It also discusses the origin, distribution, and quality of the phosphate deposits, as well as their economic and environmental significance. The younger formations crop out successively to t In this digital exhibit, we will explore the stratigraphic column of the Grand Valley (see image to the left) to learn about the different layers and the fossils contained within them. What is a geologic formation? A geologic formation is a rock layer or sequence of rock layers that are distinct from units above and below. A formation must be ... Description. The Yorktown is composed largely of o...

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