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Chunky Geologic History. W hat is happening now happened in the past. You need your ESRT. What is the oldest layer?. G. How do you know it’s the oldest?. It’s on the bottom. What is the line between B & C?. An unconformity. What process changed layers C-G?. Folding.
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Chunky Geologic History What is happening now happened in the past.
How do you know it’s the oldest? • It’s on the bottom.
What is the line between B & C? • An unconformity
What process changed layers C-G? • Folding
How do you know that the sill formed after the shale layer above it? • Contact metamorphism
What is the name of this index fossil? • Eurypterus
During which geologic period did Eurypterus live? • Silurian
Near which city in NY might these fossils be found? • Syracuse or Niagra Falls
During which geologic period did the initial opening of the Atlantic Ocean take place? • Jurassic
What is the estimated time of origin of Earth and solar system? • 4600 million or 4.6 billion years
How long ago was the area that is now NYS on the equator? • 359 million years ago
Why can’t fossils be found near Old Forge, NY? • The bedrock is not sedimentary.
Why couldn’t cavemen have a battle with T. rex? • T. rex was extinct
The following describes what useful tool in relative dating: Lived over a wide area for a relatively short period of time. • Index fossil
Who is this guy? Elliptocephalla
During which geologic period did it live? • Cambrian
If this isotope has a half-life of 10,000 years, what is the age of the sample? • 20,000 years
What two events are good time markers because a layer of sediment is laid down quickly? • Volcanic eruption & meteor strike
The meteor strike that brought dinosaurs to extinction signaled the end of which geologic era. • Mesozoic
Correlate these outcrops. What is the top layer • Tan siltstone