Flashcards in Chapter 10 Vocab Deck (33):
The remarkable diversification of life, indicated by the fossil record, that occurred at the beginning of the Cambrian Period.
The temperature below which isotopes are no longer free to move.
The boundary surface between two rock bodies (as between two stratigraphic formations, between an igneous intrusion and adjacent rock, between two igneous rock bodies, or between rocks juxtaposed by a fault).
The process of defining the age relations between the strata at one locality and the strata at another.
If one geologic feature cuts across another, the feature that has been cut is older.
The decay product of radioactive decay.
The largest subdivision of geologic time.
An interval of geologic time representing the largest subdivision of a period.
An interval of geologic time representing the largest subdivision of the Phanerozoic Eon.
A group of fossil species found in a specific sequence of sedimentary rock.
In a stratigraphic sequence, different species of fossil organisms appear in a definite order; once a fossil species disappears in a sequence of strata, it never reappears higher in the sequence.
The science of dating geologic events in years.
A composite stratigraphic chart that represents the entirety of the Earth's history.
The sequence of geologic events that has taken place in a region.
A map showing the distribution of rock units and structures across a region.
The span of time since the formation of the Earth.
Geologic Time Scale
A scale that describes the intervals of geologic time.
The time it takes for half of a group of a radioactive element’s isotopes to decay.
Widespread fossil species which survived only for a relatively short interval of geologic time.
Different versions of a given element that have the same atomic number but different atomic weights.
The science of dating geologic events in years by measuring the ratio of parent radioactive atoms to daughter product atoms.
Layers of sediment, when originally deposited, are fairly horizontal.
A radioactive isotope that undergoes decay.
An interval of geologic time representing a subdivision of a geologic era.
The interval of geologic time between Earth's formation about 4.57 Ga and the beginning of the Phanerozoic Eon 542 Ma.
The process by which a radioactive atom undergoes fission or releases particles, thereby being transformed into a new element.
The age of one geologic feature with respect to another.
A cross-section diagram of a sequence of strata summarizing information about the sequence.
A recognizable layer of a specific sedimentary rock type or set of rock types, deposited during a certain time interval, that can be traced over a broad region.
Several adjacent stratigraphic formations in a succession.
In a sequence of sedimentary rock layers, each layer must be younger than the one below, for a layer of sediment cannot accumulate unless there is already a substrate on which it can collect.
A boundary between two different rock sequences representing an interval of time during which new strata were not deposited and/or were eroded.