BIO 1130 Lecture Notes - Yoho National Park, Geologic Time Scale, Cambrian Explosion

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Cambrian and Ordivician
BIO1130 Organismal Biology
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 1
Cambrian and Ordovician periods
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BIO1130 Organismal Biology 2
Geological time scale and building height
(1floor – 60Ma, 72 floors, 12 feet/floor)
Major Eons (Ma)
Phanerozoic
(550 Ma to present time, top 9 floors’)
Proterozoic
(2,500 – 550 Ma, 33rd -63rd)
Archaean
(3,800 – 2,500 Ma, 12th –33
rd)
Hadean
(4,500 – 3,800 Ma, 0-12th)
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BIO1130 Organismal Biology 3
Major Era
Phanerozoic
Cenozoic
(65 Ma to present time, 72nd floor)
Mesozoic
(245-65 Ma, 65th to 71st)
Paleozoic
(550-245 Ma, 63th to 65th)
Proterozoic (2,500 – 550 Ma)
Archaean (3,800 – 2,500 Ma)
Hadean (4,500 – 3,800 Ma)
Geological time scale and building height
( 1floor – 60Ma, 72 floors, 12 feet/floor)
1 BIL To anearobic bac, 2 bil to adapt
to oxygenated
protists will develop to specialize
by losing their plastids, single flaggelum, multi f
flagellum, cilia, ameboid action
BEGINNINGS OF MULIT CELLUALAR LIFE:
: INVERTABRATES,
no multicellular plants in ocean bc
they do not exist,
but cells will group toegther to form invertabrates
in this period o ftime
CAMBRIAN EXPLOSION: 70 MILLION YEARS
to generate every single animal architecture
we still see today
at end of ordovician MASS EXTINCTION
WHY AT THIS POINT OF PERIOD, DID
MULTICELLUAR LIFE SUCEED? EVEN
OUR ANCESTORS ARE IN THIS PERIOD...
THE WHILE HISTORY OF COMPLEX LIFE IS
HERE
END OF DINOSAURS, RISE OF mammals a
and birds
multicells on land
multicelss in water
540 million years
ago
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Cambrian and Ordivician
BIO1130 Organismal Biology
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 4
Paleozoic periods
Paleozoic era
Cambrian 550-488 Ma
Ordovician 488-443 Ma
Silurian 443-416 Ma
Devonian 416-359 Ma
Carboniferous 359-299 Ma
Permian 299-245 Ma
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 5
3:02 PM
5
Figure 27-8
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BIO1130 Organismal Biology 6
Burgess shales – Yoho National park
no life on land yet
erosiion wil cahnge ocean chemistry
circumstance that allowed the cambran
explosion?
continental shelf- light penetration, high light productivity, good conditions for autrohpohic corganism, plus sorround equati
no plants on land yet-land is bare rock
the develop ment of the very first invertabreats is on the coast line
(line between land and continental \shelf
rocky mountain chain
soft bodied experiments wer fossilized here
500 mill years ago
(first multicells)
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Cambrian and Ordivician
BIO1130 Organismal Biology
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 7
The Cambrian
explosion
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 8
Burgess shales
and its unusual invertebrates
Université d’Ottawa / University of Ottawa 3:02 PM
BIO1130 Organismal Biology 9
Burgess shales
and its unusual invertebrates
Video 1, 2,
one of a kind organisms, but also some
decendants
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