158:
This process requires a considerable degree of effort and checking of field relationships and age dates. For instance, there may be many millions of years between a bed being laid down and an intrusive rock cutting it; the estimate of age must necessarily be between the oldest cross-cutting intrusive
219:
Chronostratigraphy is an important branch of stratigraphy because the age correlations derived are crucial in drawing accurate cross sections of the spatial organization of rocks and in preparing accurate paleogeographic reconstructions.
207:
have been found in the Upper
Cretaceous Series. Geochronological units are periods of time and take the same name as standard stratigraphic units but replacing the terms upper/lower with late/early. Thus it is also correct to say that
88:
to derive hard dating of known and well defined rock units which contain the specific fossil assemblages defined by the stratigraphic system. In practice, as it is very difficult to
201:
It is important not to confuse geochronologic and chronostratigraphic units. Chronostratigraphic units are geological material, so it is correct to say that fossils of the species
140:, may also be used to bracket depositional intervals in a chronostratigraphic column. Metamorphic rocks can occasionally be dated, and this may give some limitations to the
377:
Smith, Joshua B.; Lamanna, Matthew C.; Lacovara, Kenneth J.; Dodson, Peter Jr.; Poole, Jason C.; Smith, Jennifer R.; Giegengack, Robert; Attia, Yousry (2001).
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assemblages which may be dated more accurately and precisely by isotopic methods, the construction of a chronostratigraphic column relies heavily upon
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rocks occur at specific intervals in time and are essentially instantaneous on a geologic time scale, and because they contain
361:
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directly, inferences must be made in order to arrive at an age date which reflects the beginning of the interval.
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at some point, dating the crystalline basement will give a maximum age of that fossil assemblage.
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1337:
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rock in the fossil assemblage and the youngest rock upon which the fossil assemblage rests.
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Branch of stratigraphy that studies the ages of rock strata in relation to time
379:"A Giant Sauropod Dinosaur from an Upper Cretaceous Mangrove Deposit in Egypt"
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in which a bed could have been laid down. For example, if a bed containing
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449:(Second (abridged) ed.). International Commission on Stratigraphy.
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306:(4th ed.). Alexandria, Virginia: American Geological Institute.
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The ultimate aim of chronostratigraphy is to arrange the sequence of
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Salvador, Amos, ed. (1994). "Chapter 9. Chronostratigraphic Units".
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356:. Cambridge, England: Cambridge University Press. pp. 22–23.
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region, and eventually, the entire geologic record of the
555:
68:). The aim of chronostratigraphy is to give a meaningful
345:
72:
to these fossil assemblage intervals and interfaces.
1036:
Global
Boundary Stratotype Section and Point (GSSP)
351:
352:Fastovsky, David E.; Weishampel, David B. (1996).
279:Subcommission on Quaternary Stratigraphy (2002).
196:
41:and the time of deposition of all rocks within a
1319:
331:. New York: Van Nostrand Reinhold. p. 351.
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436:
354:The Evolution and Extinction of the Dinosaurs
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483:
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167:Chronostratigraphic units, with examples:
56:is a chronostratigraphic system based on
1031:Global Standard Stratigraphic Age (GSSA)
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285:International Commission on Stratigraphy
60:intervals of time defined by recognised
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80:Chronostratigraphy relies heavily upon
1320:
326:
295:
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329:Stratigraphy: Principles and Methods
13:
830:Adoption of the Gregorian calendar
453:from the original on 12 June 2020.
291:from the original on 28 July 2018.
14:
1364:
1333:Geochronological dating methods
712:English and British regnal year
490:
320:
302:Jackson, Juia A., ed. (1997).
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197:Differences from geochronology
75:
26:that studies the ages of rock
1:
1343:Geologic time scales of Earth
825:Old Style and New Style dates
265:
777:Pre-Julian / Julian
255:List of geochronologic names
7:
1010:Geological history of Earth
880:Astronomical year numbering
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109:cross-cutting relationships
52:The standard stratigraphic
10:
1369:
327:Schoch, Robert M. (1989).
1353:Subfields of paleontology
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1248:
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1190:
1182:Thermoluminescence dating
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1089:
1077:Samarium–neodymium dating
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1023:
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950:
888:
843:
807:
776:
767:
730:
692:
571:
546:
498:
189:series – Upper Ordovician
103:used is derived from the
896:Chinese sexagenary cycle
162:
136:, often associated with
1110:Amino acid racemisation
406:10.1126/science.1060561
1115:Archaeomagnetic dating
627:Era of Caesar (Iberia)
107:and the principles of
92:date most fossils and
1015:Geological time units
1067:Law of superposition
1062:Isotope geochemistry
281:"Chronostratigraphy"
105:law of superposition
1348:Geology terminology
1200:Fluorine absorption
1177:Luminescence dating
1072:Luminescence dating
980:Milankovitch cycles
820:Proleptic Gregorian
652:Hindu units of time
446:Stratigraphic Guide
398:2001Sci...292.1704S
392:(5522): 1704–1706.
304:Glossary of Geology
260:Tectonostratigraphy
250:Geologic time scale
1328:Chronostratigraphy
1302:Terminus post quem
1282:Synchronoptic view
1249:Linguistic methods
1210:Obsidian hydration
1145:Radiometric dating
1130:Incremental dating
1052:Chronostratigraphy
20:Chronostratigraphy
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901:Geologic Calendar
763:
762:
363:978-0-521-44496-5
338:978-0-442-28021-5
313:978-0-922152-34-6
212:lived during the
210:Tyrannosaurus rex
204:Tyrannosaurus rex
94:sedimentary rocks
22:is the branch of
1360:
1307:ASPRO chronology
1256:Glottochronology
1172:Tephrochronology
1120:Dendrochronology
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794:Proleptic Julian
784:Pre-Julian Roman
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1240:Molecular clock
1233:Genetic methods
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1205:Nitrogen dating
1192:Relative dating
1186:
1155:Potassium–argon
1102:Absolute dating
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1081:
1040:
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984:
960:Cosmic Calendar
952:Astronomic time
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884:
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789:Original Julian
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587:Ab urbe condita
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245:Geologic record
230:Biostratigraphy
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214:Late Cretaceous
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192:stage – Ashgill
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130:igneous rocks.
82:isotope geology
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66:biostratigraphy
30:in relation to
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799:Revised Julian
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617:Byzantine era
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64:assemblages (
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21:
1338:Stratigraphy
1220:Stratigraphy
1165:Uranium–lead
1135:Lichenometry
1051:
933:Winter count
916:Mesoamerican
844:Astronomical
662:Mesoamerican
647:Sothic cycle
622:Seleucid era
607:Bosporan era
595: /
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533:Paleontology
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134:Metamorphism
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90:isotopically
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54:nomenclature
51:
36:
24:stratigraphy
19:
18:
1160:Radiocarbon
835:Dual dating
694:Regnal year
672:Short Count
612:Bostran era
593:Anno Domini
526:Big History
506:Archaeology
173:Phanerozoic
171:eonothem –
150:crystalline
146:graptolites
101:methodology
76:Methodology
1322:Categories
755:Vietnamese
667:Long Count
602:Anno Mundi
597:Common Era
499:Key topics
492:Chronology
266:References
235:Chronozone
185:Ordovician
177:erathem –
43:geological
39:deposition
1292:Year zero
1272:Chronicle
1215:Seriation
1150:Lead–lead
1024:Standards
1005:Deep time
965:Ephemeris
851:Lunisolar
815:Gregorian
808:Gregorian
769:Calendars
732:Era names
702:Anka year
581:Human Era
511:Astronomy
414:1095-9203
183:system –
179:Paleozoic
148:overlies
128:extrusive
124:intrusive
1287:Timeline
1125:Ice core
998:Concepts
745:Japanese
677:Tzolk'in
642:Egyptian
451:Archived
430:33454060
422:11387472
289:Archived
224:See also
153:basement
138:faulting
114:Because
70:age date
1297:Floruit
1045:Methods
906:Iranian
874:Islamic
740:Chinese
551:Periods
521:History
516:Geology
394:Bibcode
386:Science
287:(ICS).
216:Epoch.
120:mineral
116:igneous
1093:dating
889:Others
855:Hebrew
750:Korean
561:Epochs
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62:fossil
28:strata
926:Aztec
870:Lunar
865:Solar
859:Hindu
722:Limmu
682:Haab'
637:Hijri
426:S2CID
382:(PDF)
163:Units
47:Earth
921:Maya
656:Yuga
556:Eras
538:Time
418:PMID
410:ISSN
358:ISBN
333:ISBN
308:ISBN
126:and
99:The
84:and
32:time
402:doi
390:292
142:age
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.