Geologic Timescale

Modern humans (Homo sapiens) and dinosaurs never existed together on Earth.

• True
• False

Which of the following places the geologic time eras in order from oldest to most recent?

• Precambrian, Paleozoic, Mesozoic, Cenozoic
• Mesozoic, Cenozoic, Paleozoic, Precambrian
• Cenozoic, Mesozoic, Paleozoic, Precambrian
• Paleozoic, Cenozoic, Precambrian, Mesozoic

The ______________ era covers almost 90% of earth's history.

• Paleozoic 
• Mesozoic 
• Cenozoic
• Precambrian 

Scientists chose where units of geologic time began and ended based on major changes in life forms at certain times.

• True
• False

__________ are the remains or traces of prehistoric life. They are important components of sediment and sedimentary rocks.

• Fossils
• Ambers
• Gymnosperms
• Ferns

If a fossil appears in a rock layer and then disappears in the next, what is the most likely reason.

• The entire population of the organism was frozen in suspended animation and will appear again in a more recent rock layer.
• The species became extinct and will not appear again.
• The species became extinct but will be resurrected in Jurassic World.
• The entire species was abducted by aliens.

Scientists chose where units of geologic time began and ended based on major changes in life forms at certain times.

• True
• False

Pangaea refers to a...

• large supercontinent
• Greek superhero
• Tropical fern
• Mass extinction

What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons