Exam 8: Geologic Time

________ is placing rocks in their proper sequence of formation by their contact relationships.

The task of matching geologic formations of the same age over vast distances (like between continents)is termed ________.

While the Precambrian represents 88% of Earth's history, it is not divided into periods or epochs like the Phanerozoic because there ________.

Which of the following does not have at least one, very long-lived, natural, radioactive isotope?

Give three ways that geologic formations can be correlated between localities.

Examine the geologic cross section below. a)Which feature is the youngest? ________ b)Which feature is the oldest? ________

Visualize (or draw)five, horizontal, sedimentary strata as exposed in a cliff or canyon wall identified by consecutive numbers, 1 being the lowest bed and 5 being the highest.Which of the following statements concerning the strata are true?

Who gave geology the principle of fossil succession?

An isotope's mass is equal to the sum of its protons and neutrons in its nucleus.

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

For the ________, there is a meagre fossil record and most rocks of this age are highly deformed, metamorphosed, and difficult to study.

Name a cosmogenic nuclide that can be used to date Earth's surface.

After three half-lives, one-ninth of an original, radioactive, parent isotope remains and eight-ninths has decayed into the daughter isotope.

Which geologic event or feature has the crucial contact relations to help you determine that fault B is younger than fault A, even though they don't directly contact each other?

Which type of microfossils have tests (hard parts)made of calcium carbonate and are useful as index fossils as well as for measuring past sea temperatures and climates since the Cretaceous?

The radioactive isotopes uranium-238, uranium-235, and thorium-232 eventually decay to different, stable, daughter isotopes of ________.

What term denotes blocks of older rock enclosed in a body of younger igneous rock?

After the normal fault A moved, which was the next younger geologic feature?

What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?

What kind of unconformity is the most common and why?