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A major regression could cause marine organisms in shallow seas to go extinct, but mass extinctions tend to involve both terrestrial and aquatic species, and it is harder to see how a marine regression could cause widespread extinctions of land animals. Regressions are, therefore, seen as correlates
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According to one hypothesis, regressions may be linked to a "slowdown in sea-floor spreading, leading to a generalized drop in sea level (as the mid-ocean ridges would take up less space)...." That view considers major marine regressions to be one aspect of a normal variation in rates of
118:. The accumulation of all major landmasses into one body could have facilitated a regression by providing "a slight enlargement of the ocean basins as the great continents coalesced." However, that cause could not have applied in all or even many of the other cases.
150:, around 18,000 years ago, the global sea level was 120 to 130 m (390-425 ft) lower than today. A cold spell around 6 million years ago was linked to an advance in glaciation, a marine regression, and the start of the
158:
basin. Some major regressions of the past, however, seem unrelated to glaciation episodes, with the regression that accompanied the mass extinction at the end of the
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Evidence of marine regressions and transgressions occurs throughout the fossil record, and the fluctuations are thought to have caused or contributed to several
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110:). During the Permian-Triassic extinction, the largest extinction event in the Earth's history, the global sea level fell 250 m (820 ft).
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or symptoms of major extinctions, rather than primary causes. The
Permian regression might have been related to the formation of
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134:, a clear correlation existed between marine regressions and episodes of
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Marine
Transgression and Marine Regression: World of Earth Science
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Rivers in Time: The Search for Clues to Earth's Mass
Extinctions.
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Cross-sectional diagrams illustrating the shift of sedimentary
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are exposed during a drop in sea level. The opposite event,
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Geologic event in which sea level falls relative to the land
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is a geological process occurring when areas of submerged
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Cambridge, Cambridge
University Press, 1999; p. 89.
174: – Rapid global cooling around 8,200 years ago
75:activity, which leads to major episodes of global
239:New York, Columbia University Press, 2000; p. 77.
201:Fifth edition; Thomson Brooks/Cole, 2005; p. 162.
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138:. As the balance shifts between the global
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197:Monroe, James Stewart, and Reed Wicander.
1171:Principle of cross-cutting relationships
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1181:Principle of inclusions and components
199:Physical Geology: Exploring the Earth.
104:Cretaceous–Paleogene extinction event
7:
1156:Principle of original horizontality
976:Integrated coastal zone management
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180: – Emergent coastal landform
100:Permian–Triassic extinction event
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1092:
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102:(250 million years ago, Ma) and
1166:Principle of lateral continuity
1176:Principle of faunal succession
1074:Region of freshwater influence
1:
836:Large-scale coastal behaviour
668:Beaches in estuaries and bays
87:, which in turn cause large
1390:Oceanographical terminology
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152:Messinian salinity crisis
1265:Geomorphologic processes
1148:Stratigraphic principles
1141:principles and processes
781:Coastal biogeomorphology
1331:Mass wasting processes
1199:
678:Coastal morphodynamics
47:
38:during transgression (
1207:Petrologic principles
1198:
1069:Physical oceanography
33:
1293:Marine transgression
1161:Law of superposition
898:Submergent coastline
851:Marine transgression
806:Discordant coastline
791:Concordant coastline
60:marine transgression
18:Regression (geology)
1002:Coastal engineering
220:Courtillot, Vincent
210:Courtillot, p. 141.
162:being one example.
1350:Geology portal
1308:Sediment transport
1200:
971:Coastal management
811:Emergent coastline
482:Intertidal wetland
385:Continental margin
172:8.2-kiloyear event
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42:) and regression (
1385:Coastal geography
1380:Extinction events
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1326:Glacial processes
1321:Aeolian processes
1316:Fluvial processes
1298:Marine regression
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933:Wave-cut platform
846:Marine regression
390:Continental shelf
380:Coastal waterfall
289:Coastal geography
89:extinction events
52:marine regression
16:(Redirected from
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856:Raised shoreline
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1255:Metamorphism
928:Volcanic arc
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816:Feeder bluff
723:River mouths
688:Raised beach
683:Pocket beach
611:
582:Tidal island
572:Strand plain
517:Natural arch
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148:last ice age
125:
112:
93:
85:Deccan Traps
69:
51:
49:
1230:Exfoliation
1079:River plume
893:Steep coast
866:Rocky shore
861:Rip current
741:River delta
713:Wash margin
708:Storm beach
698:Shell beach
663:Beach wrack
658:Beach ridge
648:Beach cusps
597:Tied island
587:Tidal marsh
310:Archipelago
144:hydrosphere
132:Pleistocene
126:During the
66:Description
1364:Categories
1288:Subsidence
1250:Compaction
1245:Diagenesis
1235:Weathering
1007:Grain size
981:Submersion
958:Management
943:Wind fetch
903:Surf break
821:Flat coast
751:regressive
537:Salt marsh
395:Coral reef
185:References
160:Cretaceous
140:cryosphere
136:glaciation
1220:Extrusive
1215:Intrusive
966:Accretion
948:Wind wave
908:Surf zone
763:Processes
736:Mouth bar
693:Recession
673:Beachrock
592:Tide pool
522:Peninsula
410:cliff-top
297:Landforms
79:like the
77:volcanism
1225:Volcanic
1139:Geologic
1097:Category
923:Undertow
876:Sea foam
871:Sea cave
771:Blowhole
613:Windwatt
472:Headland
320:Avulsion
166:See also
128:ice ages
122:Ice ages
83:and the
56:seafloor
1047:shingle
1027:granule
1012:boulder
990:Related
886:peresyp
796:Current
731:Debouch
640:Beaches
607:Waituna
602:Tombolo
512:Mudflat
507:Machair
497:Isthmus
417:Estuary
360:Channel
154:in the
130:of the
116:Pangaea
1037:pebble
1032:gravel
1022:cobble
567:Strait
547:Skerry
502:Lagoon
487:Island
442:Fundus
345:Bodden
44:offlap
36:facies
918:Swash
881:Shoal
562:Stack
552:Sound
542:Shoal
492:Islet
477:Inlet
467:Hapua
432:Fjord
427:Fjard
422:Firth
370:Coast
365:Cliff
340:Bight
315:Atoll
40:onlap
1052:silt
1042:sand
1017:clay
746:mega
557:Spit
527:Reef
457:Gulf
405:Dune
400:Cove
355:Cape
325:Ayre
142:and
106:(66
532:Ria
462:Gut
452:Geo
447:Gat
335:Bay
1366::
222:.
108:Ma
91:.
50:A
1131:e
1124:t
1117:v
281:e
274:t
267:v
46:)
20:)
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