anchorage to homer (or a brief history of the earth)
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Anchorage to Homer (or a brief history of the Earth). 226 Miles 4.6 Billion years. Mile 54 – 3.5 billion years ago. (Between girdwood and portage). First prokaryotic cells. Mile 128 – 2 billion years ago. (Seward-Homer split). Eukaryotic cells Free oxygen in the atmosphere. Seward. - PowerPoint PPT PresentationTRANSCRIPT
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Anchorage to Homer(or a brief history of the Earth)
226 Miles
4.6 Billion years
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Mile 54 – 3.5 billion years ago
• First prokaryotic cells
(Between girdwood and portage)
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Mile 128 – 2 billion years ago
• Eukaryotic cells• Free oxygen in the
atmosphere
(Seward-Homer split)
Seward Homer
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Mile 176 – 1 billion years ago
• Multi-cellular organisms
(Kasilof)
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Mile 196 – 600 million years ago
• First animals
(Ninilchik)
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Mile 202 – 500 million years ago
• Diversification of animals
(Cambrian explosion)• First land plants
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Mile 207 – 400 million years ago
• First insects• First amphibians
(Happy Valley)
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Mile 214 – 250 million years ago
• Dinosaurs!• First mammals
Anchor Point
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Mile 223 – 65 million years ago
• End of the dinosaurs• Earliest primates
(Just outside of Homer)
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Mile 225 – 20 million years ago
• Diversification and spread of primates
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500 yds to go! – 6 million years ago
• Earliest hominids
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Sometime around 5-7 million years ago…
Orrorin tugenensis (Kenya) Laetoli, Tanzania
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500 ft! – 2 million years ago
• Beginnings of our genus Homo
• Earliest stone tools
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~ 2.5 - 2 MA…appearance of
our genus, Homo (Africa)
“Turkana Boy” – WT 15000
ER – 3733 (Kenya)
ER – 1470 (Kenya)
Oldowan Stone Tools
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50 feet from end of Homer Spit – 200,000 years ago
• Earliest anatomically modern humans