.) 3.) Geologic Time Scale Practice: [Total Points = 5, 1 point per question] a.
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Question
.) 3.) Geologic Time Scale Practice: [Total Points = 5, 1 point per question]
a.) What is the age label for the geologic time scale we are using (refer to the far right column)? This is what MYA stands for.
b.) The numerical age range of the Mesozoic Era is 252.2 million years ago to 66 million years ago per the geological time scale on page 293 of our textbook. What is the numerical age range of the Cambrian Period?
c.)What is the name of the Eon with the numerical age range of 2,500 – 541 million years ago? REMEMBER: the answer is in the EON column – each column is a different type of age category.
d.) What is the name of the Era that covers the time age range from 66 million years ago to the present?
e.) What is the oldest numerical age listed on this time scale? Give the number.
4.) 4.) Our made-up example states that there is “a log buried in a Holocene flood,” which came first – the log or the flood? Essentially, think of which item had to be present first in order for the other item to ‘bury’ the first item. [Total Points = 2]
5.) 5.) What is the numerical age range of the Holocene Epoch? [Total Points = 2]
6.) 6.) What is the main element that the tree is made of? This is one element from the Chemical Periodic Table, An example of an element is H (for hydrogen) or Sn (for tin) – now which element is the main one in trees? Check out the periodic table herehttp://periodic.lanl.gov/index.shtml [Total Points = 2]
7.) 7.) Now that you know what numerical age range the log is from, and what material the log is made of – take these two pieces of information to decide on one type of numerical dating technique that would work to date the log. REMEMBER: Be specific – don’t just say radiometric dating – because there are many types of radiometric dating methods – pick one covered in the book. [Total Points = 2]
8.) 8.) Give two reasons why you chose the numerical dating technique that you did in question 7 for the log. [Total Points = 4, 2 points per reason]
9.) 9.) What is the numerical age range of the Permian Period? [Total Points = 2]
10.10.) What type of rock is a Felsic Volcanic Unit – it is one of the three rock types from the rock cycle we reviewed in week 3? We know that a felsic volcanic rock is more than 65% Silica and includes large amounts of Aluminum, Potassium and Sodium, thus meaning it is highly viscous. REMINDER: the answer is one of the three rock types in the rock cycle. [Total Points = 2]
11.11. ) Now that you know what numerical age range of the Permian Period and what type of rock the Felsic Volcanic Unit is,– take these two pieces of information to decide on one type of numerical dating technique that would work for this rock in this scenario. NOTE: Be specific – just don’t day radiometric dating – it is all radiometric dating – the book covers specific methods – pick one of those. [Total Points = 2]
12.12. ) Give two reasons why you chose the numerical dating technique that you did in question 11 for the rock. [Total Points = 4, 2 points per reason]
Explanation / Answer
3. a. Time scale = M.y.a. Million years ago (The earth is 4.56 billion years old, thus a million year time scale is the smallest unit that can be used to represent on the Geologic time scale, without making it too long.)
b. Cambrian period ranges from 485 m.y.a. to 541 m.y.a.
c. Proterozoic eon ranges from 541 million years ago to 2500 million years ago.
d. Cenozoic Era ranges from 66 million years ago to present.
e. The oldes numerical age on a time scale is 4000 million years ago which marks the end of the Hadean Eon and the beginnig of the Archaean Eon or the eoarchaean era.
4. For a log to be buried in a flood that came in the Holocene age (i.e. as young as 0.01 million years ago to present), the log had to be older and in existence previously. Thus the log has to be older than the flood of the Holocene age.
5. The Holocene epoch ranges from 0.01 Million years ago to present.
6. A tree is mainly composed of Carbon (C = 6 )
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