two discussions 32

#1:

This course covers a lot of information and many of the concepts are complex. Embrace the idea of reading the textbook because it offers an elegant snapshot of the entire discipline and is an excellent tool for helping you wade through a lot of complicated subjects. In order to better understand how all the details interrelate, let’s explore some of those ideas in greater detail. First, you need to complete the reading for this week. I know reading textbooks isn’t always fun, but give it a shot because there’s a lot to enjoy! Next, we’ll reflect on some of what you learned – and you can always grab your book to review along the way.

INSTRUCTIONS:

1. Review the chapter(s) assigned this week.

2. Explore the contributions of investigations at Olduvai Gorge to paleoanthropological research and provide a URL to at least one website. (10 points)

3. Identify what characteristics define a hominid – remember which aspects can be assessed in the fossil record – and provide a URL to at least one website. (10 points)

4. Your submission should be 150+ words. (5 points)


#2: Forum #7 – How is the past dated?

There are two primary techniques used to determine the age of fossils or related materials: relative and absolute.

Relative dates are based on the arrangement of artifacts or events in a sequence. Dates produced with this measurement are relative to one another but lack ties to calendrically measured time. As a result, relative dates are expressed as a range of time (date and +/- years). One example would be the arrangement of artifacts or fossils in a typological sequence or seriation based on stratigraphic analysis. Age is inferred based on the evidence surrounding the deposit/artifact/fossil. Here is an example of stratigraphic layers at an archaeological site in Canterbury. The same method applies to paleoanthropological efforts. Unless intrusion has occurred, generally, the deeper levels will be the oldest because they were deposited first.

By contrast, absolute (chronometric) dating methods rely on measurements derived from processing chemical, organic, or radiometric material. These are accurate and precise but do not always reflect when human interaction occurred. Some of these techniques can date rock material but that does not differentiate when a rock might have been shaped into a tool. Carbon dating is a well-known absolute method of dating based on the decay rate of the half-life of carbon isotopes. It is important to remember that each technique has strengths and weaknesses. When dating paleontological material, the greater the number of techniques and dates that can be determined about a site or find, the stronger the evidence to support conclusions based on those discoveries. Here is a hypothetical C14 dating sample. The textbook lists many of the most common dating techniques and methods but there are tons of others, some quite unusual, you are welcome to explore.

For example, let’s consider that not all hominid characteristics evolved at the same time. The act of becoming human was a process of adding different components such as bipedalism, the manipulation of objects into tools, the physiological expansion of the brain, etc. These events occurred at different times in the history of hominin development…so… trying to determine the actual moment when our ancestors became recognizable as humans is complex. This is a highly contentious argument – you’ll find different answers dependent upon identifying criteria.

THE TASK:

  1. Provide an example of both relative and absolute dating techniques AND explain how we define the moment our ancestors crossed the threshold into humanness. (15 points)
  2. Your post should be a minimum of 250+ words. (5 points)
  3. Cite resources used. (5 points)
  4. Leave substantive* comments on THREE (3) other student posts( on the bottom) – select ones who wrote about different examples than you selected. Use this as an opportunity to learn what they have to share. (5 points each)
 
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Also posted onJanuary 1, 1970 @ 12:00 am