||Evolution and Christianity
|Office Hours: T 1000-1150, W 1600-1650, Th 1000-1050, F 1400-1450
other times by appointment
||Phone: x 5719
Deep Time and The History of the Earth - 2
The Solar system is almost exactly one-third of the age of
the Universe! (4.57 By vs. 13.7 By)
Overview of Earth History
Time line of early Earth: from origin of solar system (4.57
Ga) to present (5 meter model).
Major occurrences of Precambrian (approx. 90% of Earth history):
- 4.57 Ba
Formation of Solar System
Oldest known meteorites.
- 4.47 Ba
Earth's accretion complete.
- 4.4 Ba
Zircons of apparent continental origin evidence of early
(Hadean) crust and surface water
- 4.0 Ba
Hadean-Archean Boundary: Archean eon begins.
Oldest known rocks.
- 3.96 Ba
Oldest known rock.
- 3.9 Ba
End of intense bombardment.
- 3.5 Ba
Banded iron & black chert containing stromatolites & filamentous structures
- 3.2 Ba
Deep-sea volcanic rock
- 3.0 Ba
Fig Tree Group
Banded iron & black chert containing stromatolites &
dividing cells; high 12C/13C, pristane
- 2.7 Ba
Steranes, a eucaryotic chemical marker, appear.
- 2.5 Ba
Archean-Proterozoic Boundary: Proterozoic eon begins
Extensive global metamorphism, modern tectonic geology begins?
Large, extensive stromatolitic reefs, oxygenic photosynthesis
- 2.2 Ba
First extensive glaciation in geological record.
- 2.2-2.0 Ba
Oxygen increases, 0.0001-0.1 atm.
- 2.1 Ba
Stromatolites, black cherts & chemical fossils. Dramatically
increased diversity vs. earlier sites.
- 2.0 Ba
Banded iron formations cease.
- 2.0-1.8 Ba
Earliest fossil eucaryotes (Green algae?). Distinguished
by larger cell size (<10um vs >100um)
- 1.75 Ba
Assured eucaryote algae-acritarchs
- 1.25 Ba
Oldest known metaphyte (green & brown algae) fossils.
- 1.0 Ba
First fossils of branched algae ("seaweed").
- 0.8-0.75 Ba
Diverse assemblage with cyanobacteria, bacteria and green algae.
Some cells in meiotic? Tetrads, possible organelles. Black chert,
stromatolites, high 12C/13C, pristane and
- 0.65 Ba
First fossils of large multicellular organisms other than algae.
- 0.6 Ba
Extensive glaciation in tropics, most of ocean covered with sea-ice.
Oxygen increases to near modern level.
- 0.542 Ba
Phanerozoic Eon begins with the Cambrian.
Trace fossils of Phycodes pedum and small shelly organisms
mark end of Precambrian.
Phanerozoic time HSU
NHM exhibits website
© R A Paselk
Last modified 17 January 2008