Organisms
What kinds of organisms went extinct; which animals were most affected?
Mostly fish and sea animals; sponges and corals were most affected.
True or false:
During the Devonian Period, the environment had low evaporation rates.
False
What are some of the possible causes of the Devonian Extinction?
Sedimentation, bolide impacts, major amounts of nutrient runoff, and rapid global warming or cooling.
How does the Devonian Mass Extinction event rank in severity out of the five mass extinctions ever to occur?
It is the least severe of all of the five mass extinctions.
Were there polar caps or glaciers before the Devonian Extinction? If so, were they small or large?
Possibly, but if so, they were small.
What is a possible cause of the Devonian Extinction?
Bolite impacts
Which of the following animals did not become extinct during the Devonian Mass Extinction event?
1. Corals
2. Tetrapods
3. Trilobites
4. Brachiopods
2. Tetrapods
Was the environment warmer or cooler than present day?
Warmer
What are bolite impacts?
Meteorite or comet impacts
What is the nickname for the Devonian Period that was created based upon the organisms living during the time?
The “Age of Fishes”
True or false:
During the Devonian Period, most of the environment had desert-like conditions.
True
What is scientists' evidence for believing that bolide impacts were a possible cause for the Devonian Extinction?
Possible impact ejecta (thin layers of iridium)
What percentage of life was lost during the extinction?
70%-80% of all species
What happened to the sea after the Devonian Mass Extinction event?
The sea levels lowered considerably.
Areas with little or no dissolved oxygen.
Hypoxic or anoxic sedimentation