Cratonic sequence - Credit: UK Photo. A 21-year-old computer-science student has won a global contest to read the first text inside a carbonized scroll from the ancient Roman city of …

 
A cratonic sequence with coarse-grained sedimentary rocks on the bottom and finer-grained sedimentary rock in the middle and carbonate rocks on top represents a: transgression. What types of sedimentary rocks represent orogenies of the Paleozoic?. Kansas basketball vs west virginia

Stratigraphic cycles. (Redirected from Stratigraphic Cycles) Stratigraphic cycles refer to the transgressive and regressive sequences bounded by unconformities in the stratigraphic record on the cratons. These cycles represent a large scale eustasy cycle since the Cambrian period with further sub-divisions of those units.Despite conceptual origins from studies of the Paleozoic strata of cratonic basins, sequence stratigraphy has largely been developed and applied to post-Paleozoic successions in extracratonic settings. The application of continental-margin sequence stratigraphic concepts to cratonic basinal successions is fraught with problems owing to slower ...A cratonic sequence is a very large-scale lithostratographic sequence that covers a complete marine transgressive-regressive cycle across a craton. They are also known as "megasequences", "stratigraphic sequences", "sloss sequence" "supersequence" or simply "sequences." In plain English, it is the geological evidence of the sea level rising and then falling, thereby depositing layers of ...There have been six cratonic sequences since the beginning of the Tejas.; Cratonic sequences were first proposed by Lawrence Sloss in 1963; each one represents a time when unconformities eroded when the seas receded.; Attempts to identify equivalent cratonic sequences on other continents have met with only limited success, suggesting that eustasy is unlikely to be the sole responsible mechanism.Sedimentary sequences are the fundamental low-frequency stratal units of sequence stratigraphy (Catuneanu et al., 2011).A "sequence," as originally defined by Sloss et al. and Sloss (), is an unconformity-bounded stratigraphic unit.Mitchum Jr. modified this to "a relatively conformable succession of genetically related strata bounded by unconformities or their correlative conformities.The Sloss cratonic sequences record the history of this dynamic tectonic environment, in the form of episodes of transgression, regression and erosion and non-deposition, generated on a timescale of tens of millions of years. These sequences occur across the craton, on areas of platform, as well as in the four main intracratonic basins, yet ...Terms in this set (54) An elongated area marking the site of mountain building is a. a. cyclothem. b. mobile belt. c. platform. d. shield. e. craton. A major transgressive-regressive cycle bounded by craton-wide unconformities is a (n) a. biostratigraphic unit.You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: The Paleozoic sedimentary record across the North America crayon has been divided into unconformity-bounded cratonic sequences with names such as Sauk, tippecanoe, kaskaskia, and absaroka. Each sequence documents what sort of events.The sequence-stratigraphic architecture of the lower part of the Sunwaptan Stage at the base of the Tunnel City Group, at the contact between Sequence stratigraphy of the Upper Cambrian (Furongian; Jiangshanian and Sunwaptan) Tunnel City Group, Upper Mississippi Valley: Transgressing assumptions of cratonic flooding | U.S. Geological SurveyCratonic sequence. A major transgressive-regressive cycle bounded by craton-wide unconformities is a(n)____. Sauk. Which was the first major transgressive sequence onto the North American craton? Craton. The relatively stable and immobile parts of continents, which form the foundation on which Phanerozoic sediments were deposited, make up the …Put the following cratonic sequences in correct order from oldest to youngest. Oldest Sequence Middle Sequence Youngest Sequence A Sauk B. Tippecanoe C. Kaskaskia 1 points Save Answer QUESTION 6 Which of the following events occurred at the end of the Ordovician? Batica colides with Laurentia producing Caledonian Orogeny Sea level fuctuation ...and Transvaal supergroups in South Africa; and (3) cratonic rift basins, of which an example is the Ventersdorp in South Africa. Archaean greenstone association All of the well preserved sedimentary sequences older than 3000 Ma, and many of the sequences formed between 2500 and 3000 Ma, occur in the Archaean greenstone association. I5-2 227true. The Cambrian sedimentary deposits of the Grand Canyon represent a regressive sequence. (T/F) false. Geologic periods are divided based on the chronology of one complete transgressive-regressive cycle. (T/F) false. The Cordilleran mobile belt marks the boundary between the United States and Canada. 18 K.R. Evans, J.F. Miller, and B.F. Dattilo cratonic settings it is not uncommon to recognize sequences that range from a few meters to tens of meters in thickness, whereas sequences typically ...The model cratons form cold and from material that was originally crystallised at shallow depth. The formation is also a time of temperature inversion in the mantle: cool material is dumped at the core mantle boundary resulting in higher-than-average core heat flux. The phase of mobile-lid convection that follows this (analogous to plate ...Kaskaskia cratonic sequence A sequence of Devonian-Mississippian sediments, which is bounded above and below by regional unconformities and recording an episode of transgression followed by full flooding of a large part of the craton and by subsequent regression. Study with Quizlet and memorize flashcards containing terms like Which was the first major transgressive sequence onto the North American craton?, What type of plate interaction produced the Taconic orogeny?, During which sequence did the eastern margin of Laurentia change from a passive plate margin to an active plate margin? and more. cratonic sequences of the Paleozoic include the Kaskaskia and the Absaroka. Most geology text books have a series of paleogeographic maps illustrating the types of rocks that were deposited along the continental margins and interior of North America (or Laurentia as it was known in the Paleozoic). There is no need to duplicate them all here,The Tejas sequence was the last major marine transgression across the North American craton.Following the late Cretaceous regression that ended the Zuñi sequence, the oceans advanced again early in the Cenozoic, peaking during the Paleocene and Eocene epochs. There were no dramatic epeiric seas in North America; indeed, the Atlantic coast advanced only as far as the Mississippi Embayment.cratonic sequence A large package of sedimentary rock, in some places 100s to 1000s of feet thick, which are bounded by regional unconformities; these sequences represent sedimentary deposits formed between great transgressions and regressions of the sea across the continents, including the North American continent.Principal Investigator: Paulo Cesar Soares | ResearchGate, the professional network for scientistsKaskaskia cratonic sequence A sequence of Devonian-Mississippian sediments, which is bounded above and below by regional unconformities and recording an episode of transgression followed by full flooding of a large part of the craton and by subsequent regression.Cratonic Sequence Click the card to flip 👆 The sedimentary rocks of the late Paleozioc can be divided into packages that have unconformities at both their upper and lower boundaries.Earth Sciences questions and answers. Question 1 Place the Paleozoic cratonic sequences of North America in the correct order, from oldest to youngest. ( )Kaskaskia Sequence ( )Sauk Sequence ( )Tippecanoe Sequence ( )Absaroka Sequence Question 2 Match the term to the correct definition. ( ) Sea-level rise 1. Transgression ...A point charge q1 = 4.10 nC is placed at the origin, and a second point charge q2 = -2.90 nC is placed on the x-axis at x = + 20.0 cm. A third point charge q3 = 2.00 nC is to be placed on the x-axis between q1 and q2. (Take as zero the potential energy of the three charges when they are infinitely far apart.) (a) What is the potential energy of ...Interior Cratonic Basins, a product for the World Petroleum Basins series of the American Association of Petroleum Geologists (AAPG), was approved in 1984 and initiated in early 1985. 1 Contributors undertook to provide useful geologic information on the regional setting, stratigraphy, structure, tectonics and basin evolution, and oil and gas systems of seven cratonic basins.The cratonic sequences of North America. Cratonic sequences are large-scale litho-stratigraphic units representing major transgressive cycles in blue and regressive cycles in brown. Each sequence is bounded above and below by craton-wide unconformities. Mountain building episodes, orogenies, are listed with the west coast of Cordilleran ...cratonic sequence* The Taconic orogeny resulted from what type of plate boundary activity? Oceanic-continental convergent.* The relatively stable and immobile parts of continents, which form the foundation on which Phanerozoic sediments were deposited, make up the. craton* Tippecanoe*29 Tem 2013 ... Taylor, 2012, The Sauk megasequence in the cratonic interior of North America: Interplay between a fully developed inner detrital belt and the ...equivalent of the Francevillian sequence. It was af­ fected by the Tadilian (Eburnean) orogeny dated at 2088±60 Ma (Weber and Bonhomme 1975) which also partially remobilized older cratonic sequences. The upper part of the sedimentary cover is repre­ sented by Lindian and west-Congolian successions to the North and the Katangian and Bushimay se­1. Cambrian cratonic sandstone ranks among the most mature in the world. 2. Erosion of the cratonic surface over the previous half a billion years created a huge volume of clastic material available for redistribution by wind, rivers and the invading shallow seas. 3.The study of cratonic sequences is called sequence stratigraphy. • In sequence stratigraphy, rocks are studied within a time- stratigraphic framework related to facies and bounded by unconformities. Appalachian mobile belt - first Phanerozoic orogeny in North America began in the Middle Ordovician. • The mountain building from the orogeny ... cratonic sequence. b. shield. d. cyclothem and more. Study with Quizlet and memorize flashcards containing terms like The Paleozoic ocean that separated North America and what is now northern Europe when the supercontinent Rodinia formed rifts that split the land mass was known as a. Iapetus.The study of cratonic sequences is called sequence stratigraphy. • In sequence stratigraphy, rocks are studied within a time- stratigraphic framework related to facies and bounded by unconformities. Appalachian mobile belt - first Phanerozoic orogeny in North America began in the Middle Ordovician. • The mountain building from the orogeny ... Some geologists believe that large-scale cycles of epeirogeny that affect entire cratonic plates can be recognized. Strata deposited in the intervals between such cycles in North America have been called sequences and have been given formal names. The most widely recognized of these are the Sauk Sequence (Late Precambrian to mid-Ordovician; about 650 to 460 million years ago), the Tippecanoe ...The _____ Sequence is the third cratonic sequence in the Paleozoic. Kaskaskian. T/F- In the Permian, continental depositional environments dominated in the eastern part of the U.S. True. T/F- Zones or belts of thrust faults are common features of Paleozoic orogenic events.Kaskaskia cratonic sequence A sequence of Devonian-Mississippian sediments, which is bounded above and below by regional unconformities and recording an episode of transgression followed by full flooding of a large part of the craton and by subsequent regression. Other articles where Tippecanoe Sequence is discussed: epeirogeny: …460 million years ago), the Tippecanoe Sequence (mid-Ordovician to Early Devonian; about 460 to 400 million years ago), the Kaskaskia Sequence (Early Devonian to mid-Carboniferous; about 408 to 320 million years ago), and the Absaroka Sequence (Late Carboniferous to mid-Jurassic; about 320 to 176 million years ago).Answer to A major transgressive-regressive cycle bounded by craton-w.... Solutions for Chapter 10 Problem 4RQ: A major transgressive-regressive cycle bounded by craton-wide unconformities is a(n) a. ____ biostratigraphic unit; b. ____ cratonic sequence; c. ____ orogeny; d. ____ shallow sea; e. ____ cyclothem. … Get solutions Get solutions Get solutions done loading Looking for the textbook?Study with Quizlet and memorize flashcards containing terms like what is the epeiric sea? a) Open, deep ocean, where black shales are deposited. b) The continental platform of the continent, covered by the ocean. c) Shallow seas covering part of the craton. d) Part of the shallow proximal ocean, where reefs form., What is mobile belt? a) Elongate areas of mountain building, primarily created ...Isolated lissencephaly sequence (ILS) is a condition that affects brain development before birth. Explore symptoms, inheritance, genetics of this condition. Isolated lissencephaly sequence (ILS) is a condition that affects brain development...A well documented intra-cratonic sedimentary sequence, the Lower Permian Shanxi Formation in the Ordos Basin, northern China, was used to illustrate a sequence stratigraphic model developed for ...THE KASKASKIA SEQUENCE ¨ Perspective: The Canning Basin, Australia— A Devonian Great Barrier Reef Reef Development in Western Canada . Black Shales The Late Kaskaskia—A Return to Extensive Carbonate Deposition. THE ABSAROKA SEQUENCE What Are Cyclothems, and Why Are They Important? Cratonic Uplift—The Ancestral RockiesStudy with Quizlet and memorize flashcards containing terms like The first crust developed in the Archean was _____, and only after weathering did crust become more _____., All Archean fossils represent multicellular eukaryotic bacteria, The oldest North American cratonic sequence, beginning in the Proterozoic and ending in the early Ordovician, is the _____ Sequence and more.Answer to A major transgressive–regressive cycle bounded by craton-w.... Solutions for Chapter 20 Problem 9RQ: A major transgressive–regressive cycle bounded by craton-wide unconformities is a(n)a. ___ cratonic sequence.b. ___ biostratigraphic unit.c. ___ orogeny.d. ___ shallow sea.e. ___ cyclothem. … Get solutions Get solutions Get …Facies sequences are a series of facies whose transitions and relationships are geologically significant with respect to depositional environment (Walker 1984; Reading 1986b ). The term 'sequence' had been co-opted in the sequence stratigraphy literature (Sect. 2.4) to have a more specific meaning.Mesozoic Era, second of Earth's three major geologic eras of Phanerozoic time. Its name is derived from the Greek term for "middle life." The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago, at the dawn of the Cenozoic Era.(See the geologic time scale.)The major divisions of the Mesozoic Era are, from oldest to ...The cratonic Indian plate is barely deformed, in great contrast to the vast pile of deformed soft young crust in the Tibetan Plateau to the north. Cratonic crust is strong, being unusually cold and dry, but that is only part of the picture. Continental crust is the upper portion of continental lithosphere.Cratonic Sequences of N. America • Cordilleraorogenies • Appalachia • orogenies • White areas represent sequences of rocks That are separated by large-scale unconformities shown in brown Cratonic Sequence • A cratonic sequence is • a large-scale lithostratigraphic unit representing a major transgressive-regressive cycle bounded by ...View Historical Geology-Chapter 10.docx from GEOL MISC at Nicholls State University. Historical Geology-Chapter 10 Pretest 1. The world's first geologic map was compiled by William Smith and depictedThe Cordilleran Orogenic Belt. Joseph A. DiPietro, in Landscape Evolution in the United States, 2013 Cratonic Deformation: Laramide and Maria Thick-Skinned Belts. The Laramide orogeny was the most recent (nonactive) orogeny to affect the Cordillera. It occurred primarily between 75 and 55 million years ago, although some structures are as young as 40 million years.Cratonic sequence. Cyclothems are a characteristic feature of which paleozoic cratonic sequence? Absaroka. Weathering of which highlands produced the catsgill delta clastic wedge? Acadian. The first paleozoic orogeny to occur in the cordilleran mobile belt was the? AntlerThe theory of uniformitarianism is the idea that. geologic processes and events of the present can help to understand Earth's past. the two most abundant elements in Earth's crust are. silicon and oxygen. which of the followin gis NOT a mafic silicate mineral. quartz. the san andreas fault marks a.The sedimentary rock record of the North American craton can be divided into six cratonic sequences. The transgressive phase of each sequence is generally _____ preserved, whereas the regressive phase is marked by _____ .It is one of the most striking cratonic sequences in the geological record, spreading sheets of sandstone across basement rock deep into the interiors of many continents. The …May 29, 2018 · craton (shield) (adj. cratonic) Area of the Earth 's crust, invariably part of a continent, which is no longer affected by orogenic activity. This stability has existed for approximately 1000Ma. A classic example is the Canadian Shield. Craton Cratons are large regions of continental crust that have remained tectonically stable for a prolonged ... ¨ the major cratonic sequences of the Early Paleozoic ¨ the importance of transgressions and regressions in the cratonic history of North America, especially as seen at the Grand Canyon ¨ the major events of the Sauk sequence ¨ the major events of the Tippecanoe sequence, with an emphasis on modern and ancient reefs and evaporites Study with Quizlet and memorize flashcards containing terms like Which of the following is NOT part of the cratonic sequence?, How many supercontinents form in the proterozoic?, During which period does sea level fluctuate greatly producing cyclothems and coal deposits? and more.original conception of sequence stratigraphy, he acknowledged that the paleogeologic or subcrop maps of A.I. Levorsen and others and the novel ideas about cratonic stratigraphy of E.O. Ulrich during the 1930s certainly had been influential, as had the later stratigraphic thinking of Harry E. Wheeler. Sloss andThe Sauk megasequence in the far inboard region of the cratonic interior of North America (Minnesota, Wisconsin, and Iowa) is divisible into two packages that fundamentally differ from one another in facies and stratigraphic attributes. A lower Sauk succession package, Marjuman-early Skullrockian in age, is characterized by deposits of the ...plural of cratonic sequenceThe Tippecanoe sequence was the cratonic sequence --that is, the marine transgression --that followed the Sauk sequence; it extended from roughly the Middle Ordovician to the Early Devonian . Sedimentary characteristics At the cratonic margins the bounding unconformities tend to disappear in continuous successions, and the cratonic sequences are replaced by others controlled by events in the marginal basins and ...Earth Sciences. Earth Sciences questions and answers. Question 11 2 Which orogenic event, along what is now the East coast of North America, marked the initial mountain building event that helped form Pangea? Acadian Antler Taconic Alleghanian Question 12 2 p Which of the following statement is NOT valid? The sedimentary record of cratonic ...The Absaroka sequence was a cratonic sequence that extended from the end of the Mississippian through the Permian periods. It is the unconformity between this sequence and the preceding Kaskaskia that divides the Carboniferous into the Mississippian and Pennsylvanian periods in North America . Like the Kaskaskia sequence, Absaroka sedimentary ...What was deposited above the cratonic sequence and how are they related to it? Q2: The Herbridean craton (Lewisian complex) makes up a significant proportion of the NW Foreland. Outline, giving evidence, the sequence of events that formed this craton during the 3.0 to 1.7 Ga period?Jul 10, 2015 · The Great Unconformity and Sauk Megasequence, plus the later planation surfaces, can be explained by Flood catastrophic processes. A possible model for the formation of these features follows. The early Flood unleashed the mechanism of the Flood, which I think was caused by impacts. 9 The very early Flood should be the most catastrophic part of ... A cratonic sequence (also known as megasequence, Sloss sequence or supersequence) in geology is a very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton (block of continental crust) over geologic time.The Tippecanoe sequence was the cratonic sequence --that is, the marine transgression --that followed the Sauk sequence; it extended from roughly the Middle Ordovician to the Early Devonian . Sedimentary characteristics Time relations of cratonic episodes are (1) oscillatory—much of Cenozoic, including present and period from Pennsylvanian to Early Jurassic (time spans of Appalachian-Hercynian, Laramide and Alpine orogenies); (2) emergent—latest Precambrian, early Middle Ordovician, Early Devonian, etc. (lacunal intervals between accumulations of cratonic ...Longest cratonic sequence Transgression - Late Mississippian Highstand in Pennsylvanian Regression Jurassic. Absaroka cratonic: Other sets by this creator. Fossils Classifications, Fossil Preservation. 88 terms. Images. Frances_Fuentes4 ...B. Zuni Cratonic Sequence (return of the epeiric sea) C. Jurassic tectonics (Nevadan Orogeny) - all during Sierra Nevada, Coastal Range, Southern Cali batholith rocks, Idaho batholith D. Distribution of Strata Eastern US a. Lou Ann Salt - accumulate lots of evaporites in evaporated Gulf of Mexico - halite b. Smackover Formation Western US a.Study with Quizlet and memorize flashcards containing terms like what is the epeiric sea? a) Open, deep ocean, where black shales are deposited. b) The continental platform of the continent, covered by the ocean. c) Shallow seas covering part of the craton. d) Part of the shallow proximal ocean, where reefs form., What is mobile belt? a) Elongate areas of mountain building, primarily created ...Meter and decameter-scale cycles (high-frequency sequences) are a common motif within the depositional sequences, and the Corbin Ranch Submember records an important peritidal succession prior to a major sequence boundary with the overlying Viola Springs Formation. ... implications for cratonic sequence stratigraphy. In: Pratt B, Holmden C (eds ...Cratonic sequence. unconformity-bounded sequences (transgression, regression, unconformity) Orogeny. mountain building event. What causes Orogenic events. Tectonic plate collision. What classifies as a Mass-extinction. 75% of life lost. In which period does Baltica collide with Laurentia.A set of things next to each other in a set order; a series. ( uncountable) The state of being sequent or following; order of succession . Complete the listed tasks in sequence. A series of musical phrases where a theme or melody is repeated, with some change each time, such as in pitch or length (example: opening of Beethoven's Fifth Symphony ).A major transgressive-regressive cycle bounded by craton-wide unconformities is a cyclothem cratonic sequence orogeny biostratigraphic unit Shallow seaway. cratonic sequence. What evidence in the geologic record indicates that the Taconic orogeny occurred? Tippecanoe Sequence Queenston delta sediments Sauk Sequence Plate tectonics Major ...A well documented intra-cratonic sedimentary sequence, the Lower Permian Shanxi Formation in the Ordos Basin, northern China, was used to illustrate a sequence stratigraphic model developed for ...

The Zuñi sequence was the major cratonic sequence after the Absaroka sequence that began in the latest Jurassic, peaked in the late Cretaceous, and ended by the start of …. Jazz degree

cratonic sequence

Zuñi sequence. The Zuñi sequence was the major cratonic sequence after the Absaroka sequence that began in the latest Jurassic, peaked in the late Cretaceous, and ended by the start of the following Paleocene.[Stanley, Steven M. "Earth System History."p. 175] Though it was not the final major transgression, it was the last complete sequence to cover the North America n craton; the following ...global changes in sea level and trangressions and regressions along the low-lying craton margins. underwent a series of collisions beginning in the Carboniferous. Laurasia and Gondwana. formation of Pangia was completed during. the Permian. Late Paleozoic worldwide ocean that surrounded the supercontinent Pangea.Study with Quizlet and memorize flashcards containing terms like What is a cratonic sequence and how is it defined?, What event does a cratonic sequence represent?, Where would you go in MI to see the basal Sauk sequence? and more.Sloss kemudian mengembangkan konsep sekuen (cratonic sequence) mebjadi alat stratigrafi yang penggunaannya pertama kali adalah untuk pembuatan peta facies. Perkembangan besar sekuen stratigrafi yaitu pada saat Vail,Mitchum, Sangree dan Thompson III dari Exxon mempubikasikan konsep stratigrafi seismik (Van.1 Eki 2023 ... ... cratonic interior of North America, and as the sea level rose, the ... Thick limestone sequences of the sauk sequence indicate that North ...The Tejas Sequence: Tertiary—Recent. At the end of the Maestrichtian Age, seas withdrew from North America and virtually every other continent. The Tejas episode began, as did others before, with high-standing continents; but unlike past times, the seas remained outside of the cratonic interior except for a brief transgression in the ...Absaroka cratonic sequence. An episode of mountain building in the northern Appalachians during Devonian. defines? Acadian Orogeny. Late Paleozoic episodes of mountain building along the present trend of the Appalachian Mountains. Likely caused by the Late Carboniferous collision between northwest Africa and the southern part of the …1. Introduction North American Phanerozoic cratonic strata show a pattern of transgressive/regressive cyclicity on a time scale of 108 yr, producing six sequences …Different segments of the subsidence curve correspond to the Sauk, Tippecanoe and Kaskaskia sequences. Secondary subsidence mechanisms superimposed on cooling ...Sedimentary sequences are the fundamental low-frequency stratal units of sequence stratigraphy (Catuneanu et al., 2011).A "sequence," as originally defined by Sloss et al. and Sloss (), is an unconformity-bounded stratigraphic unit.Mitchum Jr. modified this to "a relatively conformable succession of genetically related strata bounded by unconformities or their correlative conformities.Many cratonic basins preserve multiple thick depositional sequences (frequently over three kilometers) bounded by major unconformities, and experience strong alteration and modification over their lengthy depositional histories. Approximately 25% of the world's conventional oil and gas can be found in cratonic basins.The Barrens sequence may be a remnant of a huge cratonic sand sheet that included the Thelon, Athabasca, Amundsen and Elu basins. A regional subsidence mechanism to account for these basins may be mantle downwelling linked to the late-stage amalgamation of Laurentia.January 01, 1988. The "sedimentary cover" refers to the stratified rocks of youngest Proterozoic and Phanerozoic age that rest upon the largely crystalline basement rocks of the continental interior. The early chapters of the volume present data and interpretations of the geophysics of the craton and summarize, with sequential maps, the ...The Sauk megasequence in the far inboard region of the cratonic interior of North America (Minnesota, Wisconsin, and Iowa) is divisible into two packages that fundamentally differ from one another in facies and stratigraphic attributes. A lower Sauk succession package, Marjuman–early Skullrockian in age, is characterized by deposits of …Cratonic sequences were first proposed by Laurence L. Sloss in 1963. [1] Each one represents a time when inland seas deposited sediments across the craton. The top and bottom edges of a sequence are each bounded by craton-wide unconformities (time gaps in the rock record). The unconformities indicate when the seas receded and sediment was ....

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