geo extra credit 2 - The main point of his talk was to...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Daniel Delinko Section 33 Extra Credit Dr. Gehrels presented a lecture that gave information regarding questions about the true age of Earth. He stated, “The past is the key to predicting the future.” He first introduced the topic using a long tape in order to visualize the time frame of Earth leading up to the Phanerozoic age. This is the earliest sign of “visible life.” Prior to this period, “before visible life”, is called the Pre-Cambrian period. Dr. Gehrels mentioned the Grand Canyon and possible methods of dating the layers. The layers higher up towards the top are where one is likely to find fossils of reptiles and amphibians. This gives insight as to when these animals might have existed on a geological timeline. Dr. Gehrels stressed the importance of determining the absolute age of the Earth. He referenced many methods that have been used in the past to determine the absolute age. One of the earliest methods entailed counting generations. He also mentioned measuring the erosion rate, the sediment thickness, and also the salt content.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The main point of his talk was to inform the public about a recent technique that measures rate of decay. It measures how long it takes for a parent atom to decay to a daughter atom. He explained that this method is used at the UMC here at the university. The name of this is process is called geochronology. Inside the UMC is the Arizona LaserChron Center. It is one of the most sophisticated geochronology centers because it analyzes samples of rock from all across the globe. This method uses a mineral called Zircon because of its’ properties. It contains lots of uranium and is a very solid and durable mineral. The Zircon can also be used to determine volcanic history and approximate times of activity. This method is very accurate due to the fact that the Uranium-Lead levels can be analyzed to determine the ages up to 1%. Dr. Gehrels lecture was very informative and I learned additional information that I did not already know....
View Full Document

This note was uploaded on 04/06/2008 for the course GEO 101 taught by Professor Kapp during the Spring '07 term at University of Arizona- Tucson.

Page1 / 2

geo extra credit 2 - The main point of his talk was to...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online