Long Quiz 1_Geologic Time Scale Flashcards
Certain organisms lived on the earth based on time scale which identifies the appearance and disappearance of life forms
Geologic time scale
The theory that changes in the earth’s crust during geologic history have resulted from the action of continuous & uniform process
Uniformitarianism
Determines the exact age of the artifact in a site (numerical)
Absolute dating
Determines which object is older
Relative dating
High precision and works better for igneous and metamorphic rocks
Absolute dating
Arranges fossil in order and works better for sedimentary rocks (qualitative)
Relative dating
Founder of the study of fossils and stratigraphy
Nicholas Steno
The 5 rock formations
Superposition
Original horizontality
Lateralcontinuity
Cross cutting relationship
Principle of inclusion
Rock layers in the bottom are older
Superposition
Rock layers form in a horizontal position
Original horizontality
Rock layers are extended laterally and continuously
Lateral continuity
Rock layers that are cut across are older than the cur itself
Cross cutting relationship
Any inclusions in rock layers are older than the rock that contains it
Principle of inclusion
The 4 types of fossils
Petrification
Compression
Mold and cast
Preserved remains
A fossil where minerals replace the structure of an organism
Petrification
A fossil where minerals replace the structure of an organism
Petrification
A fossil where burial of plants or plant parts in sediments (prints)
Compression
A fossil that is dimensional and preserve the surface contours of the organism
Mold and cast
Preserves a negative imprint of the surface
Mold
Preserves the external form of the organism
Cast
Preservation of original skeletons and soft body parts.
Preserved remains
anthropocene, long period of time that is characterized by great change
Geologic epoch
How is an epoch discovered?
Golden spike (magnetic, cinematic, biologic, isotopic)
The 4 timelines
Eon
Era
Period
Epoch
The longest subdivisions which can last up to hundreds of millions of years
Eon
Second longest subdivision and marks a major shift in the types of fossils present
Era
Division within an era and marks stages within an era where different kind of organisms existed
Period
Shortest subdivision and divides periods into smaller units
Epoch
An eon that appened 4.6-4 billion years ago where primordial water first existed
Hadean eon
Eon with tectonic activity and formation of DNA
Archean eon
An eon where oxygen crisis and the first eukaryotes occured
Proterozioc eon
An eon of age of fishes and amphibians
Paleozioc era
An eon of age of reptiles and dinosaurs
Mesozoic era
An eon where dinosaurs went extinct and mammals diversified
Cenozoic era
