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SCIENCE NEWS . Google wants to buy, sell electricity in US http:// news.yahoo.com/s/afp/20100108/tc_afp/usitinternetcompanygoogleelectricity Experts: Cold snap doesn't disprove global warming http :// news.yahoo.com/s/ap/20100107/ap_on_sc/sci_big_chill. What do you think? . - PowerPoint PPT PresentationTRANSCRIPT
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SCIENCE NEWS • Google wants to buy, sell electricity in US• http://
news.yahoo.com/s/afp/20100108/tc_afp/usitinternetcompanygoogleelectricity
• Experts: Cold snap doesn't disprove global warming
• http://news.yahoo.com/s/ap/20100107/ap_on_sc/sci_big_chill
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What do you think?
• How was the Earth created?
• What was the earth like after it was formed?
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What are the benefits of studying Fossils and the Rock Record?
Geologist can reconstruct aspects of earth’s history
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Geologic Time Scale
Enables scientist to find relationships among geological events,
environmental conditions and fossilized life forms
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Geologic Time Scale• Geologic time scale – Earth history
•Subdivides geologic history into time units•Time units are based largely on the
fossils within the rocks •Originally created using relative dates
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Structure of the geologic time units scale
–Eons are subdivided into–Eras are subdivided into –periods are subdivided into –epochs
See text p 591
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Eon – the greatest expanse of time
Phanerozoic – “visible life”, most recent eon Proterozoic – before life Archean – ancient Hadean – mythical subterranean world of
departed spirits, oldest eon
Precambrian: Proterozoic, Archean, Hadean
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Eons• Largest of the time units • Three earliest eons make up 90% of
geologic time also know as Precambrian • Fossil evidence suggest simple life forms
in the Archean Eon • At end of Proterozoic Eon life evolved
into complex organisms • What eon are we currently in?
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What do you think was alive in the Hadean and early
Archean eon?
Bacteria
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Era – subdivision of an eon
• 10 – 100 millions of years• Defined by life forms found in the rocksGreek roots• Paleo = old• Meso = middle• Ceno = recent• Zoic = of life
Example: Mesozoic = middle life
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Periods• 10 of millions • Named for geographic region in which rocks or
fossils characterizing the age was first observed and described
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Epochs• 100 to Millions of years • Rocks & sediments are most complete less
time for weathering and erosion
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Evolution & Geologic Time
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What Eon, Era, Period and Epoch are we currently living
in? • Phanerozoic,–Cenozoic•Neogene–Plesitocene
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When??• What eras were the age of the dinosaurs?
• What era did mammals increase in numbers and diversity?
• What era did the Appalachian Mountains start to form?
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ANY QUESTIONS?