Geologic Time

Which of these fossils would be considered the oldest based on evidence?

• Gastropod

• Fern

• Trilobite

• Crinoid

Fish Fossils are found in the Himalayan Mountains. What does this tell scientists?

• Fish could jump very high out of water.

• The mountain range was once under water.

• Birds flying over the mountains would drop them.

• These fish could live on land at one point.

Which of these is NOT an observation that can be made from the image?

• The larger fish at the bottom is older.

• The environment changed from ocean to land.

• The dragonfly lived after the large fish.

• Fish could not survive in the more recent fossil layer.

Why are time divisions on the geologic time scale not separated into equal amounts?

• The time gets reduced by 33% each period.

• A new time division is based on an even or change on Earth.

• Scientists had their own choice when choosing the divisions.

• Because some animals lasted longer than others.

In which ERA were mammals introduced?

• Cretaceous

• Triassic

• Mesozoic

• Cenozoic

In which PERIOD were dinosaurs first introduced?

• Triassic

• Mesozoic

• Jurassic

• Paleozoic

Which is an accurate description of absolute age dating of fossils?

• The Law of Superposition

• eh.. idk

• A rock that is found in a lower layer than another is older

• Carbon dating to find the exact age of a fossil

Which of three are commonly thought to be a cause of mass extinctions in Earth's history?

• Major volcanic eruptions

• Meteor or asteroid impact

• Formation of a supercontinent

• Climate change

Which mass extinction was known as the "Great Dying"?

• Creteceous

• Permian

• Holocene

• Ordovician

A layer of ash with fossils below and none above might indicate what?

• The fossils were burnt up in the eruption.

• A change in the temperature of the universe.

• Oceans disappearing and continents forming.

• A volcanic event triggered an extinction.