Geology Reference
In-Depth Information
TABLE 19.1
Summary of the Proterozoic Geologic and Biologic Events Discussed in the Text
545 MYA
Origin and
fragmentation
of Pannotia
Ediacaran faunas
Oldest worm
burrows
Wormlike fossils; China
Rodinia fragments
Grenville orogeny
1000
Oldest defi nitive eukaryote
Midcontinent rift
Rodinia
forms
Acritarchs appear
Increase in size
and diversity of
microfossils
Mesoproterozoic
igneous activity
1600
Yavapai, Mazatzal-Pecos, and
Mojave orogens
Oldest red beds
Carbonaceous impressions, China—possible
algae
Early Proterozoic evolution of
Laurentia
Oldest well-
preserved
ophiolite
2000
Oldest known megafossil—Negaunee Iron
Formation, Michigan
Stromatolites become widespread
2500
Late Neoarchean
deformation
Single-celled prokaryotes
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