Rob Linsley, Betfair Australia, Presentation at Chief Data & Analytics Officer Forum, Melbourne
Topic: How Old is Old? Geologic Time Broadcast 4: February 7, 2001 Mrs. Joan Linsley.
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Topic: How Old is Old? Geologic Time Broadcast 4: February 7, 2001 Mrs. Joan Linsley
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Transcript of Topic: How Old is Old? Geologic Time Broadcast 4: February 7, 2001 Mrs. Joan Linsley.
Topic:How Old is Old? Geologic Time
Broadcast 4:February 7, 2001
Mrs. Joan Linsley
Relative vs. Absolute Time
• Relative: the age of a rock layer in relation to other nearby layers. The precise length of geologic time represented by any layer is often unknown.
• Absolute: the age of a rock or mineral in numbers of years.
Geolo
gic
Tim
eERA PERIOD EPOCH
AGE (millions of years)
Quarternary Pleistocene PlioceneMiocene
Oligocene
EocenePaleocene
Cretaceous
Jurassic
Triassic
Pa
leo
zoic
Permian
Tertiary
Ce
no
zoic
Me
so
zoic
1.85.0
23
38
54
65
135
192
280
Terms/Tools for Determining Age• Biostratigraphical Unit: definition of the
boundaries of a rock layer based on the ages of fossils within it
• Lithostratigraphical Unit: definition of the boundaries of a rock layer based on the physical characteristics of the rocks within
• Chronostratigraphical Unit: division of a section of rock based on the absolute ages of the rocks within it
• Geochronology: development of a time- line of events relating to the deposition or creation of rocks in a given area
Use of FossilsFossils provide a record of the slow, progressive development of life. Through the use of index fossils, one may identify a particular layer of rock wherever it is exposed.
Scientists use fossils to identify ages of rocks throughout the world.
Guest
• Dr. Michael Howell Paleontologist
University of South Carolina
Fossils
Bio
/Lit
host
rati
gra
ph
y
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