Exam 9: Precambrian Earth and Life History the Proterozoic Eon

Ophiolites are found at ____ plate margins.

Evidence for free oxygen in the atmosphere comes from ____.

Which model was developed to explain the opening and closing (creation and destruction) of ocean basins?

Sandstone-carbonate-shale assemblages are characteristic of active margin sedimentation.

Which rock types are found along passive continental margins?

The Grenville orogeny was the culminating event of the amalgamation of Laurentia.

Rocks that were formerly part of Laurentia are now mostly in ____.

After the fragmentation of Rodinia, it reassembled to form another supercontinent, ____.

What are three advantages multi-celled organisms have over single-celled organisms?

What can you conclude about the climate in the Neoproterozoic?

A eukaryotic cell has a well-defined nucleus and organelles, including mitochondria and plastids.

What happened to the carbon dioxide in Earth's early atmosphere?

Summarize and discuss the fossil evidence indicating that eukaryotic cells appeared as much as 1.2 billion years ago. Give examples of some of these early eukaryotic organisms.

Ediacaran faunal fossils are rare because they ____.

The stratigraphic sequence of an ophiolite assemblage from top to bottom is ____.

Slices of ancient oceanic crust composed of mafic-ultramafic complexes, tectonically emplaced onto the continents, are called ____.

The Pacific Ocean is in the later phase of a Wilson Cycle.

Which biological process may have resulted in the development of eukaryotic organisms from primitive prokaryotic organisms?

The supercontinent Rodinia consisted of Laurentia and other smaller landmasses.

The ____________________ represented the final stage in the Proterozoic continental accretion of Laurentia.