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were declining in diversity and instead the jawed fish were thriving and increasing in diversity in both the oceans and freshwater. The shallow, warm, oxygen-depleted waters of
Devonian inland lakes, surrounded by primitive plants, provided the environment necessary for certain early fish to develop
1039:
859:
essential characteristics such as well developed lungs, ability to crawl out of the water and onto the land for short periods of time, possibly in search of food which would be developed by the tetrapods later in the
1020:
939:
Kaufmann, B.; Trapp, E.; Mezger, K. (2004). "The numerical age of the Upper
Frasnian (Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany)".
1021:"Earth's earliest forest: fossilized trees and vegetation-induced sedimentary structures from the Middle Devonian (Eifelian) Hangman Sandstone Formation, Somerset and Devon, SW England"
974:
Algeo, T. J. (1998). "Terrestrial-marine teleconnections in the
Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events".
764:
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910:"A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications"
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827:(from 397.5 ± 2.7 million years ago to 385.3 ± 2.6 million years ago) occurred during the
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Davies, Neil S., McMahon, William J. and Berry, Christopher M. (2024).
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Philosophical
Transactions of the Royal Society B: Biological Sciences
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Parry, S. F.; Noble, S. R.; Crowley, Q. G.; Wellman, C. H. (2011).
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In the middle
Devonian the armored jawless fish known as
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The Middle
Devonian epoch is subdivided into two stages:
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891:took place near the end of the Middle Devonian.
43:but its sources remain unclear because it lacks
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579:Subdivision of the Devonian according to the
1055:: CS1 maint: multiple names: authors list (
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1008:. International Commission on Stratigraphy.
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874:) time. This new environment was formed by
863:which are descendents of these early fish.
586:Vertical axis scale: millions of years ago.
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920:(4). London: Geological Society: 863–872.
74:Learn how and when to remove this message
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870:grew in the Middle Devonian (
831:period, after the end of the
1090:. You can help Knowledge by
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850:Life in the middle Devonian
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29:This article includes a
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58:more precise citations.
988:10.1098/rstb.1998.0195
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825:Middle Devonian epoch
1006:www.stratigraphy.org
821:geological timescale
507:Famennian glaciation
1147:Geochronology stubs
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810:Upper GSSP ratified
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693:Lower boundary GSSP
670:Time span formality
1002:"Chart/Time Scale"
794:43.5032°N 3.0868°E
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660:Stratigraphic unit
650:Chronological unit
637:Time scale(s) used
548:shrubs & trees
31:list of references
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64:December 2023
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485:Rhynie chert
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50:Please help
42:
797: /
756:rotundibola
754:Ancyrodella
749:FAD of the
725: /
686:Polygnathus
681:Fad of the
56:introducing
1131:Categories
895:References
782:43°30′12″N
710:50°08′59″N
645:Definition
546:Widespread
401:Lochkovian
168:Chronology
785:3°05′12″E
713:6°28′18″E
597:Etymology
443:Famennian
315:Paleozoic
1137:Devonian
1040:Archived
872:Eifelian
844:Givetian
840:Eifelian
829:Devonian
751:Conodont
683:Conodont
628:Global (
436:Frasnian
429:Givetian
422:Eifelian
335:Devonian
949:Bibcode
819:In the
701:Germany
559:←
541:←
518:←
497:←
479:←
408:Pragian
394:Early M
360:Přídolí
305:–
295:–
285:–
275:–
265:–
255:–
245:–
235:–
225:–
215:–
205:–
195:–
185:–
52:improve
868:forest
833:Emsian
823:, the
773:France
673:Formal
664:Series
605:Formal
469:
464:
459:
454:
449:
415:Emsian
1082:This
1043:(PDF)
1024:(PDF)
835:age.
654:Epoch
619:Earth
368:Early
37:, or
1088:stub
1057:link
887:The
842:and
813:1986
741:1985
386:Late
104:PreꞒ
1032:doi
984:doi
980:353
957:doi
945:112
922:doi
918:168
630:ICS
581:ICS
377:Mid
1133::
1053:}}
1049:{{
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1030:.
1026:.
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846:.
771:,
767:,
154:Pg
98:Ma
41:,
33:,
1119:e
1112:t
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345:C
325:S
159:N
149:K
144:J
139:T
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