the less-primordial earth the mesoproterozoic era (1.0-1.6 bybp) grenville provinceorogenic belt...
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Grenville Province Orogenic Belt (0.9-1.3 byBP)
Contains metamorphosed sedimentary rocks, igneous intrusions
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Grenville Province Orogenic Belt (0.9-1.3 byBP)
Form
ation of
Su
per-con
tinen
t Rod
inia
(Rod
inia is R
ussian
for Hom
eland
)
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Grenville Province Orogenic Belt (0.9-1.3 byBP)
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Grenville Province Orogenic Belt (0.9-1.3 byBP)
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksIgneous Rocks
Anorogenic igneous intrusions (those not associated with orogenic or mountain-building events) occurred from 1.4-1.5 by in a broad belt across North America, from California to Labrador.
The plutons are composed primarily of anorthosites (rocks dominated by calcium-rich plagioclase feldspar and gabbroic minerals) and granites.
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksBelt Supergroup
Going to the Sun MountainGlacier National Park
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksBelt Supergroup
Chief MountainGlacier National Park
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksBelt Supergroup
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksGrand Canyon Sequence
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)
Mesoproterozoic RocksGrand Canyon Sequence
Vishnu SchistZoroaster Granite
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The gorge is black and narrow below, red and gray and flaring above, with crags on the walls. Down in these grand, gloomy depths we glide, ever listening, for the mad waters keep up their roar. The boats are entirely unmanageable. - John Wesley Powell
THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)Mesoproterozoic RocksGrand Canyon Sequence
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)Mesoproterozoic RocksGrand Canyon Sequence
Part of Mazatal Orogeny
(1.6-1.8 byBP)
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THE LESS-PRIMORDIAL EARTHThe Mesoproterozoic Era (1.0-1.6 byBP)Mesoproterozoic RocksGrand Canyon Sequence (correlative with Belt)
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THE LESS-PRIMORDIAL EARTHThe Neoproterozoic Era (0.544 - 1.0 byBP)Neoproterozoic RocksGrand Canyon Sequence
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THE LESS-PRIMORDIAL EARTHThe Fossil RecordEucaryotes
Appeared by Mesoproterozoic time (1.6 by to 1.4 byBP).
Increased in abundance about 1.4 by ago.
Potential for sexual reproduction and increasing variation.
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THE LESS-PRIMORDIAL EARTHThe Fossil RecordAcritarchs
Single-celled spherical, organic-walled microfossils. It is not known what sort of organism they were. They may have been phytoplankton. First appeared 1.6 by ago. Maximum diversity and abundance 850 my ago. They declined steadily during the Neoproterozoic
glaciation. Few remained by 675 my ago. Useful for correlation in Proterozoic strata.
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EARLY PALEOZOIC EVENTS
Beginning of PHANEROZOIC EONtranslates “visible life”
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EARLY PALEOZOIC EVENTS
Beginning of Phanerozoicis also beginning of thePALEOZOIC ERA
translates “ancient life”
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EARLY PALEOZOIC EVENTSPALEOGEOGRAPHY