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Questions and Answers
What is a lithostratigraphic unit primarily based on?
What is a lithostratigraphic unit primarily based on?
- Geographic location and time period
- Fossil content and rock type
- Physical characteristics and age
- Rock type, thickness, deformation, and inclusions (correct)
What distinguishes a formation from a member in lithostratigraphy?
What distinguishes a formation from a member in lithostratigraphy?
- Lateral continuity and distinctive set of characteristics (correct)
- Geographic naming and type section
- Thickness and rock type
- Depositional properties and age
What is the primary basis for chronostratigraphic units?
What is the primary basis for chronostratigraphic units?
- Physical characteristics and age
- Time and rock type (correct)
- Fossil content and geographic location
- Thickness and deformation
How are chronostratigraphic units differentiated from lithostratigraphic units?
How are chronostratigraphic units differentiated from lithostratigraphic units?
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What is the distinguishing feature of a supergroup in lithostratigraphy?
What is the distinguishing feature of a supergroup in lithostratigraphy?
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Study Notes
Lithostratigraphy
- A lithostratigraphic unit is primarily based on rock type and its physical characteristics.
- Formations are the fundamental lithostratigraphic units, representing distinct rock bodies with unique lithological features.
- Members are subdivisions within formations, characterized by a specific rock type or internal structure.
- Supergroups are the largest lithostratigraphic units, comprising multiple formations and groups that share similar lithological and stratigraphic characteristics.
Chronostratigraphy
- Chronostratigraphic units are based on age, reflecting specific intervals of geological time.
- The primary basis for defining chronostratigraphic units is fossil evidence and radiometric dating, which help establish the relative and absolute age of rock layers.
- Lithostratigraphic units are based on rock type and physical characteristics, while chronostratigraphic units focus on the age of rocks.
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