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