Exam 23: Geologic Time - Reading the Rock Record

Fossils are found in

A radiometric date is determined from mica that has been removed from a rock.What does the date signify if the mica is found in granite? What does the date signify if the mica is found in schist?

Earth's early life forms were marine organisms.Life moved to the land during the

The break-up of Pangaea resulted in the separation of

Who established the principle of faunal succession?

The Carboniferous period is well noted for the

If the half-life of some radioactive element is 1 billion years,and a mass of rock originally contained 100 g of that element,how many grams of the radioactive element would be left after three billion years had passed?

The final phase of Pangaea's break-up was the split of

The Permian period experienced major extinctions,which may have been due to

On the Geologic Time Scale,the time unit representing the largest span of time is the

Ancient coal beds can be found in Antarctica because

A surface of erosion between rocks that represents a gap in Earth history is

Coal beds are formed from the accumulation of plant material that becomes trapped in swamp floors.Yet coal deposits are present in the continent of Antarctica,where no swamps or vegetation exists.How can this be?

The Cenozoic Era is known as the

If a radioactive element has a half-life of 704 million years,and the amount of parent material remaining is one-eighth of the original amount,the specimen is about

The Devonian period is most noted for the

Radiocarbon dating is limited to the remains of plants and animals that died no longer than about

What is the evidence that a meteorite impact caused the great extinction at the end of the Mesozoic?

The high concentration of iridium at the Cretaceous Tertiary boundary is most likely attributed to

The break-up of Pangaea resulted in