The principle of superposition states that in an undisturbed sequence of rock layers, the youngest layer is on top and the oldest layer is at the bottom. The principle of original horizontality states that sedimentary rocks are originally deposited in horizontal layers. The principle of lateral continuity states that rock layers extend continuously in all directions until they thin out or reach a barrier. The principle of cross-cutting relationships states that any geological feature that cuts across a rock layer is younger than the layer it cuts through.
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Carl Owen Dunbar has written: 'Stratigraphy and correlation of the Devonian of western Tennessee' -- subject(s): Stratigraphic Geology, Geology 'Principles of stratigraphy' -- subject(s): Geology, Stratigraphic, Stratigraphic Geology
Carl O. Dunbar has written: 'Principles of stratigraphy' -- subject(s): Stratigraphic Geology
Robert Ernest Butler has written: 'Paleontology and stratigraphy of the Cynthiana formation' -- subject(s): Geology, Stratigraphic, Paleontology, Paleontology, Stratigraphic, Stratigraphic Geology, Stratigraphic Paleontology
Thomas D. Hamilton has written: 'Quaternary stratigraphic sections with radiocarbon dates, Chandler Lake quadrangle, Alaska' -- subject(s): Geology, Geology, Stratigraphic, Stratigraphic Geology 'Quaternary stratigraphic sections with radiocarbon dates, Wiseman quadrangle, Alaska' -- subject(s): Geology, Geology, Stratigraphic, Stratigraphic Geology
B. S. Norford has written: 'Ordovician and Silurian stratigraphy of the southern Rocky Mountains' -- subject(s): Geology, Geology, Stratigraphic, Stratigraphic Geology 'Correlation chart and biostratigraphy of the Silurian rocks of Canada' -- subject(s): Geology, Stratigraphic, Paleontology, Stratigraphic, Stratigraphic Geology, Stratigraphic Paleontology, Stratigraphic correlation 'The Silurian fauna of the Sandpile Group of northern British Columbia' -- subject(s): Paleontology 'Ordovician and Silurian biostratigraphy of the Sogepet-Aquitaine Kaskattama Province. No. 1 Well, northern Manitoba' -- subject(s): Borings, Geology, Stratigraphic, Stratigraphic Geology
The primary global time-stratigraphic unit is a system.
George Vincent Cohee has written: 'Rotary drilling in Illinois' -- subject(s): Oil wells, Oil well drilling, Equipment and supplies '... Lateral variation in Chester sandstones producing oil and gas in lower Wabash river area' -- subject(s): Geology, Geology, Stratigraphic, Petroleum, Stratigraphic Geology 'Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1969' -- subject(s): Geology, Stratigraphic, Nomenclature, Periodicals, Stratigraphic Geology 'The recent impetus to oil prospecting in Illinois' -- subject(s): Petroleum 'Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1975' -- subject(s): Geology, Stratigraphic, Nomenclature, Stratigraphic Geology 'Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1971' -- subject(s): Geology, Stratigraphic, Nomenclature, Stratigraphic Geology 'Recent developments in oil and gas in Illinois' -- subject(s): Petroleum, Natural gas 'Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1965' -- subject(s): Formations (Geology), Geology, Stratigraphic, Nomenclature, Stratigraphic Geology
R. E. Criss has written: 'An organic origin for the carbonate concretions of the Ohio Shale' -- subject(s): Carbonate Rocks, Concretions, Geology, Stratigraphic, Ohio River Valley, Ohio Shale, Organic geochemistry, Rocks, Carbonate, Stratigraphic Geology 'Principles of stable isotope distribution' -- subject(s): Stable isotopes
Norman L. Hatch has written: 'Redefinition of the Hawley and Goshen schists in western Massachusetts' -- subject(s): Formations (Geology), Geology, Nomenclature, Petrology, Schists, Stratigraphic Geology, Stratigraphic correlation 'Some suggested stratigraphic relations in part of Southwestern New England' -- subject(s): Nomenclature, Stratigraphic Geology, Stratigraphic correlation
Gerald William Thomas has written: 'Stratigraphic paleontology of the Morgan formation, Uinta Mountains and vicinity' -- subject(s): Geology, Stratigraphic, Paleontology, Stratigraphic Geology
Christopher J. Cleal has written: 'British upper carboniferous stratigraphy' -- subject(s): Geology, Stratigraphic, Geology, Stratigraphic Geology 'Palaeozoic palaeobotany of Great Britain' -- subject(s): Paleobotany, Plants, Fossil, Geology, Stratigraphic, Stratigraphic Geology, Fossil Plants