Term
– Paleoproterozoic Era (2.5 - 1.6 by
ago)
– Mesoproterozoic Era (1.6 to 1.0 by
ago)
– Neoproterozoic Era (1.0 by ago
to the beginning of the Paleozoic,
542 my ago) |
|
Definition
| The Proterozoic Eon is divided into which three Eras? |
|
|
Term
• More modern style of plate tectonics
• More modern style of sedimentation
• More modern global climate with glaciations
• Establishment of the beginnings of an oxygen-rich atmosphere
• Emergence of eukaryotes |
|
Definition
| The beginning of the Proterozoic marks the beginning of what? |
|
|
Term
1. Active plate tectonics and mountain building
2. Earth's first glaciation
3. Rise in atmospheric oxygen (great oxidation event).
4. Accumulation of high concentrations of organic matter in sediments generation of petroleum |
|
Definition
| What were the four major events of the Paleoproterozoic? |
|
|
Term
| 2.6 - 2.1 billion years ago |
|
Definition
| When were there global glaciations? |
|
|
Term
– North America (Huronian glaciation, southern Canada)
– Europe
– southern Africa
– India |
|
Definition
| Where were glacial deposits found? |
|
|
Term
|
Definition
– Mudstones with alternating summer and winter layers of sediments.
– deposition in lakes adjacent to ice sheets. |
|
|
Term
|
Definition
| dropped from melting icebergs in varved sedimentary rocks |
|
|
Term
| tillites or glacial diamictites |
|
Definition
| poorly sorted conglomerates of glacial debris |
|
|
Term
|
Definition
| due to abrasion as ice moved |
|
|
Term
- varves
- glacial dropstones
- tillites or glacial diamictites
- striation on beds |
|
Definition
| Evidence for glaciation includes what things? |
|
|
Term
| assembly of supercontinent Rodinia about 1.1 billion years ago |
|
Definition
| What were the major event of the Mesoproterozoic? |
|
|
Term
| 750 million; proto-Pacific Ocean, (Panthalassa) |
|
Definition
| Rodinia began to rift and break up about ___ years ago, forming the ___ along the western side of North America. |
|
|
Term
|
Definition
| What was the highlight of the Neoproterozoic? |
|
|
Term
|
Definition
| extensive continental glaciations |
|
|
Term
|
Definition
| photosynthetic microorganisms |
|
|
Term
|
Definition
– Unicellular and heterotrophic (i.e. eat others for energy)
– Protist (i.e. eukaryotic microorganisms)
– Foraminifera, amoeba |
|
|
Term
|
Definition
| multicellular animals (eukaryotes) |
|
|
Term
|
Definition
|
|
Term
|
Definition
| Life at the beginning of the Proterozoic was similar to that in the ___ |
|
|
Term
1. Anaerobic prokaryotes in oxygen-deficient environments
2. Photosynthetic cyanobacteria (prokaryotes) constructed stromatolites |
|
Definition
| Describe life at the beginning of the Proterozoic. |
|
|
Term
|
Definition
| The appearance of ___ is a major event in the history of life. |
|
|
Term
|
Definition
| Eukaryotes have the potential for ___ |
|
|
Term
|
Definition
| increases variation through genetic recombination |
|
|
Term
|
Definition
| Although appeared by ___, Eukaryotes diversified during Proterozoic |
|
|
Term
|
Definition
| Although appeared by Archean, Eukaryotes diversified during ___ |
|
|
Term
|
Definition
| Although appeared by Archean, ___ diversified during Proterozoic |
|
|
Term
|
Definition
| ___ are multicellular animals |
|
|
Term
|
Definition
___ appeared in Neoproterozoic about 630
million year (m. y.) ago. |
|
|
Term
|
Definition
| ___ are preserved as impressions of soft-bodied organisms in sandstones |
|
|
Term
|
Definition
| Fossils with hard parts or shells appeared in the ___ |
|
|
Term
- Resembles structures built by a tube-dwelling annelid worm.
– Found in Namibia, Africa. |
|
Definition
| Describe the earliest known organism with a CaCO3 shell |
|
|
